forked from 1b-agent/fieldcraft-upstream
LS-DYNA keyword writer (implicit static and eigenvalue, M3) (#25)
* decks: LS-DYNA keyword writer (long format, implicit static and eigenvalue) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm * decks: LS-DYNA golden files, Jacobian-sign node-order tests, re-reader and refusals Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm * docs: LS-DYNA writer status and deck notes Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm * decks: simplify the LS-DYNA writer (plan decides once, cards written in place, shared test tables) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm * decks: LS-DYNA joins FORMATS (deck.write lsdyna), refusals reported together, shared concentrated loads Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm * decks: LS-DYNA on main's shared deck API (steps parameter, model helpers) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm --------- Co-authored-by: jyviko <2501648+jyviko@users.noreply.github.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
13 files changed
+2353
-3
No files matched your search
@@ -0,0 +1,729 @@
|
||||
//! LS-DYNA keyword decks for implicit linear static and eigenvalue analyses.
|
||||
//!
|
||||
//! The deck is written from the public LS-DYNA keyword manual (R14), in our own words and with
|
||||
//! our own examples. What it writes:
|
||||
//! - `*KEYWORD long=y`: every field 20 columns wide (see [`card`] for why), then `*NODE` for the
|
||||
//! mesh and the reference points;
|
||||
//! - one `*PART` per section and element kind, with `*SECTION_SOLID`, `*SECTION_SHELL` or
|
||||
//! `*SECTION_BEAM` (rods as trusses) and the element formulation mapped from the section's
|
||||
//! ([`elements`]); `*HOURGLASS` where a reduced-integration formulation needs it;
|
||||
//! - `*MAT_ELASTIC` for isotropic and `*MAT_ORTHOTROPIC_ELASTIC` (global material axes) for
|
||||
//! orthotropic materials;
|
||||
//! - `*ELEMENT_SOLID` (tetrahedra and wedges as degenerate hexahedra, 10-node tetrahedra),
|
||||
//! `*ELEMENT_SOLID_H20`, `*ELEMENT_SHELL` and `*ELEMENT_BEAM`;
|
||||
//! - `*SET_NODE_LIST` and `*SET_SEGMENT` for the sets boundary conditions, loads and couplings
|
||||
//! use (with the set's name as title);
|
||||
//! - couplings: kinematic as `*CONSTRAINED_NODAL_RIGID_BODY` (the reference point first in its
|
||||
//! node set), distributing as `*CONSTRAINED_INTERPOLATION` (the reference point dependent on
|
||||
//! the set's translations, equal weights);
|
||||
//! - per step: `*CONTROL_IMPLICIT_GENERAL`, `*CONTROL_IMPLICIT_SOLUTION` (linear) or
|
||||
//! `*CONTROL_IMPLICIT_EIGENVALUE`, `*CONTROL_TERMINATION` (a static step is one implicit step
|
||||
//! from time 0 to 1 with every load ramped by one curve, `*DEFINE_CURVE`); boundary conditions
|
||||
//! as `*BOUNDARY_SPC_*_ID` (named) and `*BOUNDARY_PRESCRIBED_MOTION_*_ID` for non-zero
|
||||
//! displacements; forces, moments and tractions as `*LOAD_NODE_SET`/`_POINT` from the
|
||||
//! resolved nodal values; pressure as `*LOAD_SEGMENT_SET`; gravity as `*LOAD_BODY_X/Y/Z`
|
||||
//! (with `*LOAD_BODY_PARTS` when it acts on a set); output as `*DATABASE_BINARY_D3PLOT`,
|
||||
//! `*DATABASE_SPCFORC` and `*DATABASE_EXTENT_BINARY`.
|
||||
//!
|
||||
//! Several steps are independent analyses in the model (nothing carries over), which is what
|
||||
//! LS-DYNA's `*CASE` runs: each step is a case between `*CASE_BEGIN_n` and `*CASE_END_n`, run in
|
||||
//! order when LS-DYNA is started with `CASE` on its command line. A single step is written
|
||||
//! without cases.
|
||||
//!
|
||||
//! What LS-DYNA cannot take is an [`Error::Unsupported`] naming the item: beam sections (not yet
|
||||
//! written), body forces per volume, kinematic couplings of some degrees of freedom only, boundary
|
||||
//! conditions on a coupled reference point, gravity on different sets, hybrid formulations other
|
||||
//! than on tet4, reduced integration of quadratic elements, materials without a density, more
|
||||
//! than 10 shell integration points.
|
||||
|
||||
mod card;
|
||||
mod elements;
|
||||
|
||||
use std::collections::{BTreeMap, BTreeSet};
|
||||
|
||||
use modelcraft_model::{
|
||||
BoundaryCondition, CouplingKind, Diagnostic, Dofs, Elastic, Element, ElementKind, Load, Model, OutputVariable, Procedure, Resolved, Section,
|
||||
SectionKind, Step, Target,
|
||||
};
|
||||
|
||||
use crate::{Error, Result};
|
||||
use card::{Deck, Field};
|
||||
use card::{WIDTH, ints};
|
||||
use elements::{Hourglass, Keyword};
|
||||
|
||||
/// The format's name in [`Error::Unsupported`].
|
||||
pub(crate) const FORMAT: &str = "LS-DYNA";
|
||||
|
||||
/// The positions of an element's model-order nodes in the order LS-DYNA takes them (repeats
|
||||
/// for degenerate forms), for readers and checks of written decks.
|
||||
pub fn node_order(kind: ElementKind) -> &'static [usize] {
|
||||
elements::order(kind)
|
||||
}
|
||||
|
||||
/// A written deck.
|
||||
#[derive(Debug, Clone, PartialEq)]
|
||||
pub struct Written {
|
||||
/// The deck, ASCII.
|
||||
pub text: String,
|
||||
/// Reals that did not fit a 20-column field exactly and were rounded (to at least 13
|
||||
/// significant digits).
|
||||
pub rounded_values: usize,
|
||||
/// Number of `*CASE` analyses (0 when the model has one step and no cases are written).
|
||||
pub cases: usize,
|
||||
/// The model check's warnings (a written model has no errors).
|
||||
pub warnings: Vec<Diagnostic>,
|
||||
}
|
||||
|
||||
/// Largest deck written, in bytes (a deck is built in memory).
|
||||
pub const MAX_DECK_BYTES: usize = 1 << 31;
|
||||
|
||||
/// Most shell integration points LS-DYNA's Gauss rule takes.
|
||||
const MAX_SHELL_POINTS: u32 = 10;
|
||||
|
||||
/// A resolved model that breaks its own invariants (unreachable after `resolve`).
|
||||
fn broken(what: String) -> Error {
|
||||
Error::Model(modelcraft_model::Error::Invalid(format!("inconsistent resolved model: {what}")))
|
||||
}
|
||||
|
||||
/// One `*PART`: a section's elements of one kind.
|
||||
struct Part<'a> {
|
||||
id: u32,
|
||||
name: &'a str,
|
||||
section: &'a Section,
|
||||
kind: ElementKind,
|
||||
elform: i32,
|
||||
material: u32,
|
||||
hourglass: Option<u32>,
|
||||
elements: Vec<(u32, &'a Element)>,
|
||||
}
|
||||
|
||||
/// Every id the deck uses, decided before anything is written.
|
||||
struct Plan<'a> {
|
||||
parts: Vec<Part<'a>>,
|
||||
/// Material name → MID, for the materials sections use.
|
||||
materials: BTreeMap<&'a str, u32>,
|
||||
hourglasses: BTreeMap<Hourglass, u32>,
|
||||
/// Set name → SID (node and segment sets have separate id spaces; both use this number).
|
||||
sets: BTreeMap<&'a str, u32>,
|
||||
/// Sets written as node sets, and as segment sets.
|
||||
node_sets: BTreeSet<&'a str>,
|
||||
segment_sets: BTreeSet<&'a str>,
|
||||
/// Forces and moments written on a node set: load → (value per node, SID).
|
||||
uniform: BTreeMap<&'a str, ([f64; 3], u32)>,
|
||||
/// The part set gravity acts on, when it acts on a set.
|
||||
gravity_parts: Option<Vec<u32>>,
|
||||
}
|
||||
|
||||
/// Write the model as an LS-DYNA keyword deck.
|
||||
pub fn write(model: &Model) -> Result<Written> {
|
||||
let r = model.resolve()?;
|
||||
write_with(model, &r)
|
||||
}
|
||||
|
||||
/// The writer of [`crate::FORMATS`]: the deck's text from a resolved model.
|
||||
pub(crate) fn write_resolved(model: &Model, r: &Resolved) -> Result<String> {
|
||||
write_with(model, r).map(|w| w.text)
|
||||
}
|
||||
|
||||
fn write_with(model: &Model, r: &Resolved) -> Result<Written> {
|
||||
let estimate = (model.nodes().len() + model.reference_points().len()) * 130 + model.elements().len() * 260;
|
||||
if estimate > MAX_DECK_BYTES {
|
||||
return Err(Error::Limit(format!("the deck would be about {estimate} bytes; at most {MAX_DECK_BYTES} are written")));
|
||||
}
|
||||
let plan = plan(model, r)?;
|
||||
let mut d = Deck { text: String::with_capacity(estimate), rounded: 0 };
|
||||
let steps = model.steps();
|
||||
let cases = if steps.len() > 1 { steps.len() } else { 0 };
|
||||
|
||||
d.line("*KEYWORD long=y");
|
||||
d.comment("Written by ModelCraft: implicit linear analysis, long format (20-column fields).");
|
||||
d.comment(&format!("Units: {} (consistent; nothing is converted).", model.units().label()));
|
||||
if cases > 0 {
|
||||
d.comment(&format!("{cases} steps are written as *CASE analyses: run LS-DYNA with CASE on its command line."));
|
||||
}
|
||||
nodes(&mut d, model);
|
||||
materials(&mut d, model, &plan)?;
|
||||
parts(&mut d, &plan)?;
|
||||
element_cards(&mut d, &plan)?;
|
||||
sets(&mut d, model, r, &plan)?;
|
||||
couplings(&mut d, model, r, &plan)?;
|
||||
if let Some(parts) = &plan.gravity_parts {
|
||||
d.line("*SET_PART_LIST");
|
||||
d.header(&["sid"]);
|
||||
d.card([Field::from(1u32)]);
|
||||
d.list(parts);
|
||||
d.line("*LOAD_BODY_PARTS");
|
||||
d.header(&["psid"]);
|
||||
d.card([Field::from(1u32)]);
|
||||
}
|
||||
let mut constraint_id = 0u32;
|
||||
for (i, step) in steps.iter().enumerate() {
|
||||
let n = u32::try_from(i + 1).map_err(|_| Error::Limit("too many steps".into()))?;
|
||||
if cases > 0 {
|
||||
d.line(&format!("*CASE_BEGIN_{n}"));
|
||||
}
|
||||
write_step(&mut d, model, r, &plan, step, n, &mut constraint_id)?;
|
||||
if cases > 0 {
|
||||
d.line(&format!("*CASE_END_{n}"));
|
||||
}
|
||||
}
|
||||
d.line("*END");
|
||||
if d.text.len() > MAX_DECK_BYTES {
|
||||
return Err(Error::Limit(format!("the deck is {} bytes; at most {MAX_DECK_BYTES} are written", d.text.len())));
|
||||
}
|
||||
Ok(Written { text: d.text, rounded_values: d.rounded, cases, warnings: r.warnings.clone() })
|
||||
}
|
||||
|
||||
fn plan<'a>(model: &'a Model, r: &Resolved) -> Result<Plan<'a>> {
|
||||
let used: BTreeSet<&str> = model.sections().values().map(|s| s.material.as_str()).collect();
|
||||
let materials: BTreeMap<&str, u32> = used.into_iter().enumerate().map(|(i, m)| Ok((m, id(i)?))).collect::<Result<_>>()?;
|
||||
// Everything LS-DYNA cannot express, reported at once.
|
||||
let mut refused = BTreeSet::new();
|
||||
let mut parts = Vec::new();
|
||||
let mut hourglasses: BTreeMap<Hourglass, u32> = BTreeMap::new();
|
||||
for (name, sec) in model.sections() {
|
||||
let mut by_kind: BTreeMap<ElementKind, Vec<(u32, &Element)>> = BTreeMap::new();
|
||||
for e in r.sets.get(&sec.set).map(|s| s.elements.as_slice()).unwrap_or_default() {
|
||||
let el = model.element(*e).ok_or_else(|| broken(format!("element {e} of section `{name}`")))?;
|
||||
by_kind.entry(el.kind).or_default().push((*e, el));
|
||||
}
|
||||
if let SectionKind::Shell { points, .. } = sec.kind
|
||||
&& points > MAX_SHELL_POINTS
|
||||
{
|
||||
refused.insert(format!(
|
||||
"section `{name}`: {points} integration points through the thickness (LS-DYNA's Gauss rule takes at most {MAX_SHELL_POINTS})"
|
||||
));
|
||||
}
|
||||
for (kind, list) in by_kind {
|
||||
let f = match elements::elform(kind, &sec.kind, sec.formulation, name) {
|
||||
Ok(f) => f,
|
||||
Err(why) => {
|
||||
refused.insert(why);
|
||||
continue;
|
||||
}
|
||||
};
|
||||
let next = id(hourglasses.len())?;
|
||||
let hourglass = f.hourglass.map(|h| *hourglasses.entry(h).or_insert(next));
|
||||
parts.push(Part {
|
||||
id: id(parts.len())?,
|
||||
name,
|
||||
section: sec,
|
||||
kind,
|
||||
elform: f.elform,
|
||||
material: materials.get(sec.material.as_str()).copied().unwrap_or_default(),
|
||||
hourglass,
|
||||
elements: list,
|
||||
});
|
||||
}
|
||||
}
|
||||
let sets: BTreeMap<&str, u32> = model.sets().keys().enumerate().map(|(i, n)| Ok((n.as_str(), id(i)?))).collect::<Result<_>>()?;
|
||||
|
||||
// Which sets are written, and what the steps need that LS-DYNA may not express.
|
||||
let coupled: BTreeSet<&str> = model.couplings().values().map(|c| c.reference_point.as_str()).collect();
|
||||
let mut node_sets = BTreeSet::new();
|
||||
let mut segment_sets = BTreeSet::new();
|
||||
let mut uniform = BTreeMap::new();
|
||||
for (name, c) in model.couplings() {
|
||||
if c.kind == CouplingKind::Kinematic && c.dofs != Dofs::all() {
|
||||
refused.insert(format!(
|
||||
"coupling `{name}`: a kinematic coupling of some degrees of freedom only (LS-DYNA's nodal rigid bodies release degrees of freedom reliably only for two nodes)"
|
||||
));
|
||||
}
|
||||
if c.kind == CouplingKind::Distributing {
|
||||
node_sets.insert(c.set.as_str());
|
||||
}
|
||||
}
|
||||
let mut gravity_sets: BTreeSet<Option<&str>> = BTreeSet::new();
|
||||
for step in model.steps() {
|
||||
let is_static = matches!(step.procedure, Procedure::Static {});
|
||||
for b in &step.boundary_conditions {
|
||||
let Some(bc) = model.boundary_conditions().get(b) else { continue };
|
||||
match bc.target() {
|
||||
Target::Set(s) => {
|
||||
node_sets.insert(s.as_str());
|
||||
}
|
||||
Target::ReferencePoint(p) if coupled.contains(p.as_str()) => {
|
||||
refused.insert(format!(
|
||||
"boundary condition `{b}`: reference point `{p}` is coupled, and LS-DYNA takes no constraint on a node of a nodal rigid body or on an interpolation's dependent node; constrain the coupled set instead"
|
||||
));
|
||||
}
|
||||
Target::ReferencePoint(_) => {}
|
||||
}
|
||||
}
|
||||
if !is_static {
|
||||
continue;
|
||||
}
|
||||
for l in &step.loads {
|
||||
let Some(load) = model.loads().get(l) else { continue };
|
||||
match load {
|
||||
Load::Force { target, .. } | Load::Moment { target, .. } => {
|
||||
if let Target::Set(s) = target
|
||||
&& let Some(v) = uniform_on_set(r, l, s)
|
||||
&& let Some(sid) = sets.get(s.as_str())
|
||||
{
|
||||
node_sets.insert(s.as_str());
|
||||
uniform.insert(l.as_str(), (v, *sid));
|
||||
}
|
||||
}
|
||||
Load::Traction { .. } => {}
|
||||
Load::Pressure { set, .. } => {
|
||||
segment_sets.insert(set.as_str());
|
||||
}
|
||||
Load::Gravity { set, .. } => {
|
||||
gravity_sets.insert(set.as_deref());
|
||||
}
|
||||
Load::BodyForce { .. } => {
|
||||
refused.insert(format!("load `{l}`: a body force per unit volume (LS-DYNA's body loads are accelerations; use gravity)"));
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
let gravity_parts = match gravity_sets.into_iter().collect::<Vec<_>>().as_slice() {
|
||||
[] | [None] => None,
|
||||
[Some(set)] => parts_of_set(r, &parts, set).map_err(|why| refused.insert(why)).ok(),
|
||||
_ => {
|
||||
refused.insert("gravity on different sets (LS-DYNA applies every body load to one part subset per deck)".into());
|
||||
None
|
||||
}
|
||||
};
|
||||
for m in materials.keys() {
|
||||
if model.material(m).is_some_and(|m| m.density.is_none()) {
|
||||
refused.insert(format!("material `{m}` has no density, and LS-DYNA requires a mass density on every material"));
|
||||
}
|
||||
}
|
||||
crate::unsupported(FORMAT, refused)?;
|
||||
Ok(Plan { parts, materials, hourglasses, sets, node_sets, segment_sets, uniform, gravity_parts })
|
||||
}
|
||||
|
||||
/// A 1-based id from a 0-based index.
|
||||
fn id(i: usize) -> Result<u32> {
|
||||
u32::try_from(i + 1).map_err(|_| Error::Limit("more than 4294967295 items of one kind".into()))
|
||||
}
|
||||
|
||||
/// The parts that make up a set's elements exactly, or why not.
|
||||
fn parts_of_set(r: &Resolved, parts: &[Part], set: &str) -> std::result::Result<Vec<u32>, String> {
|
||||
let elements: BTreeSet<u32> = r.sets.get(set).map(|s| s.elements.iter().copied().collect()).unwrap_or_default();
|
||||
let mut ids = Vec::new();
|
||||
let mut covered = 0;
|
||||
for p in parts {
|
||||
let inside = p.elements.iter().filter(|(e, _)| elements.contains(e)).count();
|
||||
if inside == p.elements.len() {
|
||||
ids.push(p.id);
|
||||
covered += inside;
|
||||
} else if inside > 0 {
|
||||
return Err(format!(
|
||||
"gravity on set `{set}`, which holds part of section `{}`'s elements (LS-DYNA applies body loads to whole parts)",
|
||||
p.name
|
||||
));
|
||||
}
|
||||
}
|
||||
if covered != elements.len() || ids.is_empty() {
|
||||
return Err(format!("gravity on set `{set}`, whose elements are not whole sections"));
|
||||
}
|
||||
Ok(ids)
|
||||
}
|
||||
|
||||
/// The value every node of a force or moment gets, when it is one value on exactly the set's
|
||||
/// nodes (then the load is written on the node set).
|
||||
fn uniform_on_set(r: &Resolved, load: &str, set: &str) -> Option<[f64; 3]> {
|
||||
let values = r.nodal_loads.get(load)?;
|
||||
let first = values.first()?.1;
|
||||
let nodes = &r.sets.get(set)?.nodes;
|
||||
(values.len() == nodes.len() && values.iter().zip(nodes).all(|((n, v), m)| n == m && *v == first)).then_some(first)
|
||||
}
|
||||
|
||||
fn nodes(d: &mut Deck, model: &Model) {
|
||||
// The mesh nodes are sorted; the few reference points are merged in by label.
|
||||
let mut points: Vec<(u32, [f64; 3])> = model.reference_points().values().map(|p| (p.label, p.xyz)).collect();
|
||||
points.sort_unstable_by_key(|p| p.0);
|
||||
let mut points = points.into_iter().peekable();
|
||||
d.line("*NODE");
|
||||
d.header(&["nid", "x", "y", "z"]);
|
||||
let card = |d: &mut Deck, label: u32, [x, y, z]: [f64; 3]| d.card([Field::from(label), Field::from(x), Field::from(y), Field::from(z)]);
|
||||
for (label, n) in model.nodes() {
|
||||
while let Some((l, xyz)) = points.next_if(|p| p.0 < *label) {
|
||||
card(d, l, xyz);
|
||||
}
|
||||
card(d, *label, n.xyz);
|
||||
}
|
||||
for (l, xyz) in points {
|
||||
card(d, l, xyz);
|
||||
}
|
||||
}
|
||||
|
||||
fn materials(d: &mut Deck, model: &Model, plan: &Plan) -> Result<()> {
|
||||
for (name, &mid) in &plan.materials {
|
||||
let m = model.material(name).ok_or_else(|| broken(format!("material `{name}`")))?;
|
||||
let rho = m.density.unwrap_or_default();
|
||||
match m.elastic {
|
||||
Some(Elastic::Isotropic { young, poisson }) => {
|
||||
d.line("*MAT_ELASTIC_TITLE");
|
||||
d.line(name);
|
||||
d.header(&["mid", "ro", "e", "pr"]);
|
||||
d.card([Field::from(mid), Field::from(rho), Field::from(young), Field::from(poisson)]);
|
||||
}
|
||||
Some(Elastic::EngineeringConstants { young: [e1, e2, e3], poisson: [n12, n13, n23], shear: [g12, g13, g23] }) => {
|
||||
// LS-DYNA takes the minor ratios: ν_ba = ν_ab·E_b/E_a.
|
||||
d.line("*MAT_ORTHOTROPIC_ELASTIC_TITLE");
|
||||
d.line(name);
|
||||
d.header(&["mid", "ro", "ea", "eb", "ec", "prba", "prca", "prcb"]);
|
||||
let mut card = vec![Field::from(mid)];
|
||||
card.extend([rho, e1, e2, e3, n12 * e2 / e1, n13 * e3 / e1, n23 * e3 / e2].map(Field::from));
|
||||
d.card(card);
|
||||
d.header(&["gab", "gbc", "gca", "aopt"]);
|
||||
d.card([g12, g23, g13, 2.0].map(Field::from));
|
||||
d.header(&["xp", "yp", "zp", "a1", "a2", "a3"]);
|
||||
d.card([Field::Blank, Field::Blank, Field::Blank, Field::from(1.0), Field::from(0.0), Field::from(0.0)]);
|
||||
d.header(&["v1", "v2", "v3", "d1", "d2", "d3"]);
|
||||
d.card([Field::Blank, Field::Blank, Field::Blank, Field::from(0.0), Field::from(1.0), Field::from(0.0)]);
|
||||
}
|
||||
None => return Err(broken(format!("material `{name}` has no elastic constants"))),
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn parts(d: &mut Deck, plan: &Plan) -> Result<()> {
|
||||
for p in &plan.parts {
|
||||
match p.section.kind {
|
||||
SectionKind::Solid {} => {
|
||||
d.line("*SECTION_SOLID");
|
||||
d.header(&["secid", "elform"]);
|
||||
d.card([Field::from(p.id), Field::from(p.elform)]);
|
||||
}
|
||||
SectionKind::Shell { thickness, offset, points } => {
|
||||
d.line("*SECTION_SHELL");
|
||||
d.header(&["secid", "elform", "shrf", "nip"]);
|
||||
d.card([Field::from(p.id), Field::from(p.elform), Field::from(5.0 / 6.0), Field::from(points)]);
|
||||
d.header(&["t1", "t2", "t3", "t4", "nloc"]);
|
||||
// The model's offset is the reference (node) surface's distance from the
|
||||
// mid-surface along the normal, as a fraction of the thickness; NLOC puts the
|
||||
// mid-surface at −NLOC·t/2 from the nodes.
|
||||
let nloc = if offset == 0.0 { Field::Blank } else { Field::from(2.0 * offset) };
|
||||
d.card([Field::from(thickness), Field::Blank, Field::Blank, Field::Blank, nloc]);
|
||||
}
|
||||
SectionKind::Rod { area } => {
|
||||
d.line("*SECTION_BEAM");
|
||||
d.header(&["secid", "elform"]);
|
||||
d.card([Field::from(p.id), Field::from(p.elform)]);
|
||||
d.header(&["a"]);
|
||||
d.card([Field::from(area)]);
|
||||
}
|
||||
SectionKind::Beam { .. } => return Err(broken(format!("section `{}`: beams have no LS-DYNA formulation", p.name))),
|
||||
}
|
||||
}
|
||||
for (h, hgid) in &plan.hourglasses {
|
||||
d.line("*HOURGLASS");
|
||||
d.header(&["hgid", "ihq", "qm"]);
|
||||
match h {
|
||||
Hourglass::Solid => d.card([Field::from(*hgid), Field::from(6), Field::from(1.0)]),
|
||||
Hourglass::Shell => d.card([Field::from(*hgid), Field::from(4)]),
|
||||
}
|
||||
}
|
||||
let several: BTreeMap<&str, usize> = plan.parts.iter().fold(BTreeMap::new(), |mut m, p| {
|
||||
*m.entry(p.name).or_default() += 1;
|
||||
m
|
||||
});
|
||||
for p in &plan.parts {
|
||||
d.line("*PART");
|
||||
if several.get(p.name).copied().unwrap_or_default() > 1 {
|
||||
d.line(&format!("{} {}", p.name, p.kind.name()));
|
||||
} else {
|
||||
d.line(p.name);
|
||||
}
|
||||
d.header(&["pid", "secid", "mid", "eosid", "hgid"]);
|
||||
let hg = p.hourglass.map_or(Field::Blank, Field::from);
|
||||
d.card([Field::from(p.id), Field::from(p.id), Field::from(p.material), Field::Blank, hg]);
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn element_cards(d: &mut Deck, plan: &Plan) -> Result<()> {
|
||||
let mut by_keyword: BTreeMap<Keyword, Vec<(u32, u32, &Element)>> = BTreeMap::new();
|
||||
for p in &plan.parts {
|
||||
by_keyword.entry(Keyword::of(p.kind)).or_default().extend(p.elements.iter().map(|(label, el)| (*label, p.id, *el)));
|
||||
}
|
||||
for (keyword, mut elements) in by_keyword {
|
||||
elements.sort_unstable_by_key(|e| e.0);
|
||||
d.line(keyword.name());
|
||||
match keyword {
|
||||
Keyword::Shell | Keyword::Beam => d.header(&["eid", "pid", "n1", "n2", "n3", "n4", "n5", "n6", "n7", "n8"]),
|
||||
Keyword::Solid | Keyword::SolidH20 => {
|
||||
d.header(&["eid", "pid"]);
|
||||
d.header(&["n1", "n2", "n3", "n4", "n5", "n6", "n7", "n8", "n9", "n10"]);
|
||||
}
|
||||
}
|
||||
for (label, pid, el) in elements {
|
||||
let nodes = elements::connectivity(el.kind, &el.nodes).ok_or_else(|| broken(format!("element {label} has {} nodes", el.nodes.len())))?;
|
||||
match keyword {
|
||||
Keyword::Shell | Keyword::Beam => d.card([Field::from(label), Field::from(pid)].into_iter().chain(ints(&nodes))),
|
||||
Keyword::Solid | Keyword::SolidH20 => {
|
||||
d.card([Field::from(label), Field::from(pid)]);
|
||||
for chunk in nodes.chunks(10) {
|
||||
d.card(ints(chunk));
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn sets(d: &mut Deck, model: &Model, r: &Resolved, plan: &Plan) -> Result<()> {
|
||||
for name in &plan.node_sets {
|
||||
let (Some(sid), Some(set)) = (plan.sets.get(name), r.sets.get(*name)) else { continue };
|
||||
d.line("*SET_NODE_LIST_TITLE");
|
||||
d.line(name);
|
||||
d.header(&["sid"]);
|
||||
d.card([Field::from(*sid)]);
|
||||
d.list(&set.nodes);
|
||||
}
|
||||
for name in &plan.segment_sets {
|
||||
let (Some(sid), Some(set)) = (plan.sets.get(name), r.sets.get(*name)) else { continue };
|
||||
d.line("*SET_SEGMENT_TITLE");
|
||||
d.line(name);
|
||||
d.header(&["sid"]);
|
||||
d.card([Field::from(*sid)]);
|
||||
d.header(&["n1", "n2", "n3", "n4"]);
|
||||
for f in &set.faces {
|
||||
let nodes = model.face_nodes(*f).ok_or_else(|| broken(format!("element {} face {}", f.element, f.face)))?;
|
||||
// Corner nodes only: LS-DYNA recognises the quadratic face from its corners and
|
||||
// spreads the pressure over the mid-side nodes too.
|
||||
let corners = match nodes.len() {
|
||||
3 | 6 => nodes.get(..3).zip(nodes.get(2..3)),
|
||||
_ => nodes.get(..4).zip(Some(&[][..])),
|
||||
};
|
||||
let (first, repeat) = corners.ok_or_else(|| broken(format!("element {} face {} has {} nodes", f.element, f.face, nodes.len())))?;
|
||||
d.card(ints(first).chain(ints(repeat)));
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn couplings(d: &mut Deck, model: &Model, r: &Resolved, plan: &Plan) -> Result<()> {
|
||||
let mut next_set = id(model.sets().len())?;
|
||||
let mut next_part = id(plan.parts.len())?;
|
||||
let mut next_interpolation = 1u32;
|
||||
for (name, c) in model.couplings() {
|
||||
let rp =
|
||||
r.reference_point_nodes.get(&c.reference_point).copied().ok_or_else(|| broken(format!("coupling `{name}`: no reference point node")))?;
|
||||
let nodes = r.sets.get(&c.set).map(|s| s.nodes.as_slice()).unwrap_or_default();
|
||||
match c.kind {
|
||||
CouplingKind::Kinematic => {
|
||||
// The reference point leads: it is the first node of the rigid body's set.
|
||||
d.line("*SET_NODE_LIST_TITLE");
|
||||
d.line(&format!("{name} (rigid body)"));
|
||||
d.header(&["sid"]);
|
||||
d.card([Field::from(next_set)]);
|
||||
let members: Vec<u32> = std::iter::once(rp).chain(nodes.iter().copied().filter(|n| *n != rp)).collect();
|
||||
d.list(&members);
|
||||
d.line("*CONSTRAINED_NODAL_RIGID_BODY_TITLE");
|
||||
d.line(name);
|
||||
d.header(&["pid", "cid", "nsid"]);
|
||||
d.card([Field::from(next_part), Field::Blank, Field::from(next_set)]);
|
||||
next_set = next_set.checked_add(1).ok_or_else(|| Error::Limit("too many node sets".into()))?;
|
||||
next_part = next_part.checked_add(1).ok_or_else(|| Error::Limit("too many parts".into()))?;
|
||||
}
|
||||
CouplingKind::Distributing => {
|
||||
let sid = plan.sets.get(c.set.as_str()).copied().ok_or_else(|| broken(format!("coupling `{name}`: set `{}`", c.set)))?;
|
||||
let ddof: i64 = c.dofs.list().iter().fold(0, |acc, d| acc * 10 + i64::from(*d));
|
||||
d.comment(&format!("coupling `{name}`"));
|
||||
d.line("*CONSTRAINED_INTERPOLATION");
|
||||
d.header(&["icid", "dnid", "ddof", "cidd", "ityp", "idnsw", "fgm"]);
|
||||
// FGM = 1: the dependent node is not part of the mesh.
|
||||
d.card([
|
||||
Field::from(next_interpolation),
|
||||
Field::from(rp),
|
||||
Field::Int(ddof),
|
||||
Field::Blank,
|
||||
Field::from(1),
|
||||
Field::Blank,
|
||||
Field::from(1),
|
||||
]);
|
||||
d.header(&["inid", "idof"]);
|
||||
d.card([Field::from(sid), Field::from(123)]);
|
||||
next_interpolation += 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// LS-DYNA's degree-of-freedom code for prescribed motion and nodal loads: 1–3 translations,
|
||||
/// 5–7 rotations.
|
||||
fn dof_code(dof: u8) -> i32 {
|
||||
if dof <= 3 { i32::from(dof) } else { i32::from(dof) + 1 }
|
||||
}
|
||||
|
||||
fn write_step(d: &mut Deck, model: &Model, r: &Resolved, plan: &Plan, step: &Step, n: u32, constraint_id: &mut u32) -> Result<()> {
|
||||
d.line("*TITLE");
|
||||
d.line(&step.name);
|
||||
let is_static = matches!(step.procedure, Procedure::Static {});
|
||||
d.line("*CONTROL_IMPLICIT_GENERAL");
|
||||
d.header(&["imflag", "dt0"]);
|
||||
d.card([Field::from(1), Field::from(1.0)]);
|
||||
match step.procedure {
|
||||
Procedure::Static {} => {
|
||||
d.line("*CONTROL_IMPLICIT_SOLUTION");
|
||||
d.header(&["nsolvr"]);
|
||||
d.card([Field::from(1)]);
|
||||
}
|
||||
Procedure::Frequency { modes, min_hz, max_hz } => {
|
||||
d.line("*CONTROL_IMPLICIT_EIGENVALUE");
|
||||
d.header(&["neig", "center", "lflag", "lftend", "rflag", "rhtend"]);
|
||||
let bound = |b: Option<f64>| match b {
|
||||
Some(v) => [Field::from(1), Field::from(v)],
|
||||
None => [Field::Blank, Field::Blank],
|
||||
};
|
||||
let mut card = vec![Field::from(modes), Field::Blank];
|
||||
card.extend(bound(min_hz));
|
||||
card.extend(bound(max_hz));
|
||||
d.card(card);
|
||||
if step.output.contains(&OutputVariable::Stress) || step.output.contains(&OutputVariable::Strain) {
|
||||
d.header(&["isolid", "ibeam", "ishell", "itshell", "mstres"]);
|
||||
d.card([Field::Blank, Field::Blank, Field::Blank, Field::Blank, Field::from(1)]);
|
||||
}
|
||||
}
|
||||
}
|
||||
d.line("*CONTROL_TERMINATION");
|
||||
d.header(&["endtim"]);
|
||||
d.card([Field::from(1.0)]);
|
||||
|
||||
// Every load and prescribed motion of a static step follows one ramp from 0 to 1.
|
||||
let prescribes = step
|
||||
.boundary_conditions
|
||||
.iter()
|
||||
.filter_map(|b| model.boundary_conditions().get(b))
|
||||
.any(|b| (1..=6).any(|dof| b.value(dof).is_some_and(|v| v != 0.0)));
|
||||
let loads: Vec<(&String, &Load)> = step.loads.iter().filter_map(|l| model.loads().get_key_value(l)).collect();
|
||||
if is_static && (prescribes || !loads.is_empty()) {
|
||||
d.line("*DEFINE_CURVE_TITLE");
|
||||
d.line(&format!("{} ramp", step.name));
|
||||
d.header(&["lcid"]);
|
||||
d.card([Field::from(n)]);
|
||||
d.header(&["a1", "o1"]);
|
||||
d.card([Field::from(0.0), Field::from(0.0)]);
|
||||
d.card([Field::from(1.0), Field::from(1.0)]);
|
||||
}
|
||||
|
||||
for b in &step.boundary_conditions {
|
||||
let Some(bc) = model.boundary_conditions().get(b) else { continue };
|
||||
boundary_condition(d, r, plan, b, bc, is_static, n, constraint_id)?;
|
||||
}
|
||||
if is_static {
|
||||
let mut gravity = [0.0f64; 3];
|
||||
let mut pointwise = Vec::new();
|
||||
for (name, load) in &loads {
|
||||
match load {
|
||||
Load::Force { .. } | Load::Moment { .. } if plan.uniform.contains_key(name.as_str()) => {
|
||||
on_node_set(d, plan, name, matches!(load, Load::Moment { .. }), n);
|
||||
}
|
||||
Load::Force { .. } | Load::Moment { .. } | Load::Traction { .. } => pointwise.push(*name),
|
||||
Load::Pressure { set, magnitude } => {
|
||||
let sid = plan.sets.get(set.as_str()).copied().unwrap_or_default();
|
||||
d.comment(&format!("load `{name}`"));
|
||||
d.line("*LOAD_SEGMENT_SET");
|
||||
d.header(&["ssid", "lcid", "sf"]);
|
||||
d.card([Field::from(sid), Field::from(n), Field::from(*magnitude)]);
|
||||
}
|
||||
Load::Gravity { acceleration, .. } => {
|
||||
for (g, a) in gravity.iter_mut().zip(acceleration) {
|
||||
*g += a;
|
||||
}
|
||||
}
|
||||
Load::BodyForce { .. } => return Err(broken(format!("load `{name}`: a body force"))),
|
||||
}
|
||||
}
|
||||
// The other concentrated loads node by node, summed where they share a node.
|
||||
let point = crate::concentrated_loads(model, r, pointwise);
|
||||
if !point.is_empty() {
|
||||
d.line("*LOAD_NODE_POINT");
|
||||
d.header(&["nid", "dof", "lcid", "sf"]);
|
||||
for ((node, dof), v) in point {
|
||||
d.card([Field::from(node), Field::from(dof_code(dof)), Field::from(n), Field::from(v)]);
|
||||
}
|
||||
}
|
||||
// A base acceleration loads the model against its direction, so gravity g is written
|
||||
// with scale factor −g.
|
||||
for (axis, g) in ["X", "Y", "Z"].iter().zip(gravity) {
|
||||
if g != 0.0 {
|
||||
d.line(&format!("*LOAD_BODY_{axis}"));
|
||||
d.header(&["lcid", "sf"]);
|
||||
d.card([Field::from(n), Field::from(-g)]);
|
||||
}
|
||||
}
|
||||
d.line("*DATABASE_BINARY_D3PLOT");
|
||||
d.header(&["dt"]);
|
||||
d.card([Field::from(1.0)]);
|
||||
if step.output.contains(&OutputVariable::ReactionForce) {
|
||||
d.line("*DATABASE_SPCFORC");
|
||||
d.header(&["dt"]);
|
||||
d.card([Field::from(1.0)]);
|
||||
}
|
||||
if step.output.contains(&OutputVariable::Strain) {
|
||||
d.line("*DATABASE_EXTENT_BINARY");
|
||||
d.header(&["neiph", "neips", "maxint", "strflg"]);
|
||||
d.card([Field::Blank, Field::Blank, Field::Blank, Field::from(1)]);
|
||||
}
|
||||
} else if !loads.is_empty() {
|
||||
d.comment("Loads have no effect on natural frequencies and are not written in this step.");
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn boundary_condition(
|
||||
d: &mut Deck,
|
||||
r: &Resolved,
|
||||
plan: &Plan,
|
||||
name: &str,
|
||||
bc: &BoundaryCondition,
|
||||
is_static: bool,
|
||||
lcid: u32,
|
||||
constraint_id: &mut u32,
|
||||
) -> Result<()> {
|
||||
let (entity, suffix) = match bc.target() {
|
||||
Target::Set(s) => (plan.sets.get(s.as_str()).copied().ok_or_else(|| broken(format!("boundary condition `{name}`: set `{s}`")))?, "SET"),
|
||||
Target::ReferencePoint(p) => {
|
||||
(r.reference_point_nodes.get(p).copied().ok_or_else(|| broken(format!("boundary condition `{name}`: reference point `{p}`")))?, "NODE")
|
||||
}
|
||||
};
|
||||
let dofs = bc.dofs();
|
||||
// Held degrees of freedom (in a frequency step every constrained one is held).
|
||||
let held: Vec<u8> = dofs.list().into_iter().filter(|dof| !is_static || bc.value(*dof).is_none_or(|v| v == 0.0)).collect();
|
||||
if !held.is_empty() {
|
||||
d.line(&format!("*BOUNDARY_SPC_{suffix}_ID"));
|
||||
id_card(d, constraint_id, name);
|
||||
d.header(&["nsid", "cid", "dofx", "dofy", "dofz", "dofrx", "dofry", "dofrz"]);
|
||||
d.card([Field::from(entity), Field::Blank].into_iter().chain((1..=6u8).map(|dof| Field::from(i32::from(held.contains(&dof))))));
|
||||
}
|
||||
if is_static {
|
||||
for dof in dofs.list() {
|
||||
let Some(v) = bc.value(dof).filter(|v| *v != 0.0) else { continue };
|
||||
d.line(&format!("*BOUNDARY_PRESCRIBED_MOTION_{suffix}_ID"));
|
||||
id_card(d, constraint_id, name);
|
||||
d.header(&["nsid", "dof", "vad", "lcid", "sf"]);
|
||||
d.card([Field::from(entity), Field::from(dof_code(dof)), Field::from(2), Field::from(lcid), Field::from(v)]);
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// The ID card of an `_ID` keyword: the next id and a heading.
|
||||
fn id_card(d: &mut Deck, id: &mut u32, heading: &str) {
|
||||
*id = id.saturating_add(1);
|
||||
d.line(&format!("{id:>WIDTH$}{heading}"));
|
||||
}
|
||||
|
||||
/// A force or moment with one value on every node of its set ([`Plan::uniform`]), on the node set.
|
||||
fn on_node_set(d: &mut Deck, plan: &Plan, name: &str, moment: bool, lcid: u32) {
|
||||
let Some(&(v, sid)) = plan.uniform.get(name) else { return };
|
||||
d.comment(&format!("load `{name}`"));
|
||||
d.line("*LOAD_NODE_SET");
|
||||
d.header(&["nsid", "dof", "lcid", "sf"]);
|
||||
let first = if moment { 4 } else { 1 };
|
||||
for (dof, c) in (first..).zip(v) {
|
||||
if c != 0.0 {
|
||||
d.card([Field::from(sid), Field::from(dof_code(dof)), Field::from(lcid), Field::from(c)]);
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in new issue
Block a user