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Nastran bulk data writer (SOL 101/103) and deck.write steps (M3) (#24)

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* Nastran bulk data writer: fixed-format entries, exact large-field reals, SOL 101/103 decks

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* Nastran writer tests: golden decks, a re-reader of our output, node order against Nastran's conventions

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* docs: Nastran writer in the roadmap, parity table and deck notes

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* Nastran writer: simplify planning (subcases, one property table), stream cards into the deck, write through the VFS

ElementKind::corner_count/is_quadratic and Dofs::bits/from_bits join the model.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

* Nastran joins the shared deck formats; deck.write chooses steps for every format

nastran::write_resolved is the FORMATS row; Format::write_steps and with_steps write a subset of
steps (a Nastran run is static or frequency steps); problems go through the shared unsupported().

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:
Irakli KourtisClaude Opus 5.5jyviko
 authored and GitHub committed 2026-10-13 17:34:26 -04:00
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commit f4a0333d28
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+2266 -5
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crates/engine/src/lib.rs
+5
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@@ -239,6 +239,11 @@ mod tests {
json!({"format": "abaqus", "path": 7}),
json!({"format": "x".repeat(100_000), "path": "/no/such/part.inp"}),
json!({"format": null, "path": "/no/such/part.inp"}),
json!({"format": "nastran", "path": "/no/such/dir/part.bdf"}),
json!({"format": "nastran", "path": "/no/such/dir/part.bdf", "steps": ["Bend"]}),
json!({"format": "nastran", "path": "/no/such/dir/part.bdf", "steps": [null, 3, "Modes"]}),
json!({"format": "nastran", "path": "/no/such/dir/part.bdf", "steps": vec!["x".repeat(1000); 2000]}),
json!({"format": "nastran", "path": "/no/such/dir/part.bdf", "steps": {}}),
json!({"path": 7}),
json!({"body": "Body1", "tolerance": 0.05}),
json!({"body": null, "tolerance": "fine"}),