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// SPDX-License-Identifier: AGPL-3.0-or-later
import assert from "node:assert";
import { describe, it } from "node:test";
import {
applyBoundaryActionToDeck,
extractFeaSlicingProperties,
getFeaDialect,
synthesizeFeaBoundary,
type BoundaryActionPayload,
} from "../src/index.js";
describe("@modelscript/fea Dialect Architecture", () => {
it("resolves the 'inp' dialect by id and extension", () => {
const dialectById = getFeaDialect("inp");
const dialectByExt = getFeaDialect(".inp");
assert.strictEqual(dialectById.id, "inp");
assert.strictEqual(dialectByExt.id, "inp");
});
it("materializes embedded expressions with parameter lookup using the dialect", () => {
const dialect = getFeaDialect("inp");
const template = `** FEA Deck for {{ DroneArm.name }}
*HEADING
ModelScript Structural Study
*MATERIAL, NAME={{ DroneArm.material }}
*ELASTIC
{{ DroneArm.youngsModulus }}, {{ DroneArm.poissonsRatio }}
*STEP
*STATIC
*CLOAD
10, 2, {{ DroneArm.thrust * 1.5 }}
*BOUNDARY
1, 1, 3
*END STEP
`;
const parameters = {
"DroneArm.name": "HexaDroneArm",
"DroneArm.material": "ALUMINUM_6061",
"DroneArm.youngsModulus": 70e9,
"DroneArm.poissonsRatio": 0.33,
"DroneArm.thrust": 20.0,
};
const materialized = dialect.materialize(template, { evaluator: parameters });
assert.ok(materialized.includes("** FEA Deck for HexaDroneArm"));
assert.ok(materialized.includes("*MATERIAL, NAME=ALUMINUM_6061"));
assert.ok(materialized.includes("70000000000, 0.33") || materialized.includes("7e+10, 0.33"));
assert.ok(materialized.includes("10, 2, 30"));
});
it("parses elements, nodes, materials, and loads into canonical FeaModelData", () => {
const dialect = getFeaDialect("inp");
const deck = `*HEADING
Cantilever Beam Study
*NODE
1, 0.0, 0.0, 0.0
2, 1.0, 0.0, 0.0
3, 0.0, 1.0, 0.0
4, 0.0, 0.0, 1.0
*ELEMENT, TYPE=C3D4, ELSET=BEAM
1, 1, 2, 3, 4
*MATERIAL, NAME=STEEL
*ELASTIC
210000000000, 0.3
*DENSITY
7850
*BOUNDARY
1, 1, 3
*CLOAD
2, 2, -500.0
`;
const parsed = dialect.parse(deck);
assert.strictEqual(parsed.dialect, "inp");
assert.strictEqual(parsed.heading, "Cantilever Beam Study");
assert.strictEqual(parsed.nodes.size, 4);
assert.deepStrictEqual(parsed.nodes.get(2), { id: 2, x: 1.0, y: 0.0, z: 0.0 });
assert.strictEqual(parsed.elements.size, 1);
assert.strictEqual(parsed.elements.get(1)?.type, "C3D4");
assert.deepStrictEqual(parsed.elements.get(1)?.nodes, [1, 2, 3, 4]);
const mat = parsed.materials.get("STEEL");
assert.ok(mat);
assert.strictEqual(mat.E, 210e9);
assert.strictEqual(mat.nu, 0.3);
assert.strictEqual(mat.rho, 7850);
assert.ok(parsed.fixedNodes.has(1));
assert.deepStrictEqual(parsed.nodalLoads.get(2), [0, -500, 0]);
});
it("synthesizes FEA boundary directives and injects them into *STEP blocks", () => {
const fixAction: BoundaryActionPayload = {
kind: "fix",
targetId: "FIXED_ROOT",
dofs: [1, 3],
};
const forceAction: BoundaryActionPayload = {
kind: "force",
targetId: 105,
vector: [0.0, 1500.0, -3000.0],
};
const pressureAction: BoundaryActionPayload = {
kind: "pressure",
targetId: "SKIN_SURFACE",
magnitude: 25000.0,
};
const fixSnippet = synthesizeFeaBoundary(fixAction, "calculix");
assert.strictEqual(fixSnippet, "*BOUNDARY\nFIXED_ROOT, 1, 1, 0.0\nFIXED_ROOT, 3, 3, 0.0");
const contiguousFixSnippet = synthesizeFeaBoundary(
{ kind: "fix", targetId: "FIXED_ROOT", dofs: [1, 2, 3] },
"calculix",
);
assert.strictEqual(contiguousFixSnippet, "*BOUNDARY\nFIXED_ROOT, 1, 3, 0.0");
const forceSnippet = synthesizeFeaBoundary(forceAction, "calculix");
assert.ok(forceSnippet.includes("*CLOAD"));
assert.ok(forceSnippet.includes("105, 2, 1500"));
assert.ok(forceSnippet.includes("105, 3, -3000"));
const pressureSnippet = synthesizeFeaBoundary(pressureAction, "calculix");
assert.strictEqual(pressureSnippet, "*DLOAD\nSKIN_SURFACE, P, 25000");
const baseDeck = `*HEADING
Cantilever Plate
*STEP
*STATIC
*CLOAD
1, 2, -100.0
*END STEP
`;
const updated = applyBoundaryActionToDeck(baseDeck, fixAction, "calculix");
assert.ok(updated.includes("*BOUNDARY\nFIXED_ROOT, 1, 1, 0.0\nFIXED_ROOT, 3, 3, 0.0"));
assert.ok(
updated.indexOf("*BOUNDARY") < updated.indexOf("*END STEP"),
"*BOUNDARY must be inserted before *END STEP",
);
});
it("parses BDF decks including CQUAD4, CTETRA, MAT1, SPC, and FORCE cards", () => {
const dialect = getFeaDialect("bdf");
assert.strictEqual(dialect.id, "bdf");
const bdfDeck = `$ Bulk Data Deck
GRID,1,,0.0,0.0,0.0
GRID,2,,10.0,0.0,0.0
GRID,3,,10.0,10.0,0.0
GRID,4,,0.0,10.0,0.0
GRID,5,,0.0,0.0,10.0
CQUAD4,101,1,1,2,3,4
CTETRA,201,1,1,2,3,5
MAT1,1,2.1E11,,0.3,7850.0
SPC1,1,123456,1,4
FORCE,1,2,0,500.0,0.0,-1.0,0.0
ENDDATA
`;
const parsed = dialect.parse(bdfDeck);
assert.strictEqual(parsed.dialect, "bdf");
assert.strictEqual(parsed.nodes.size, 5);
assert.deepStrictEqual(parsed.nodes.get(1), { id: 1, x: 0.0, y: 0.0, z: 0.0 });
assert.deepStrictEqual(parsed.nodes.get(3), { id: 3, x: 10.0, y: 10.0, z: 0.0 });
assert.strictEqual(parsed.elements.size, 2);
assert.deepStrictEqual(parsed.elements.get(101), { id: 101, type: "CQUAD4", family: "shell", nodes: [1, 2, 3, 4] });
assert.deepStrictEqual(parsed.elements.get(201), { id: 201, type: "CTETRA", family: "solid", nodes: [1, 2, 3, 5] });
const mat = parsed.materials.get("1");
assert.ok(mat);
assert.strictEqual(mat.E, 2.1e11);
assert.strictEqual(mat.nu, 0.3);
assert.strictEqual(mat.rho, 7850.0);
assert.ok(parsed.fixedNodes.has(1));
assert.ok(parsed.fixedNodes.has(4));
assert.deepStrictEqual(parsed.nodalLoads.get(2), [0.0, -500.0, 0.0]);
});
it("materializes safe math functions, scientific notation, and captures diagnostics", () => {
const dialect = getFeaDialect("inp");
const template = `
FORCE= {{ 1.5e4 * 2.0 }}
TRIG_FORCE= {{ sind(30) * 1000 }}
SQRT_VAL= {{ sqrt(144) }}
PI_VAL= {{ PI }}
BAD_VAL= {{ missing_symbol + 10 }}
`;
const diagnostics: any[] = [];
const materialized = dialect.materialize(template, { diagnostics });
assert.ok(materialized.includes("FORCE= 30000"));
assert.ok(materialized.includes("TRIG_FORCE= 500"));
assert.ok(materialized.includes("SQRT_VAL= 12"));
assert.ok(materialized.includes("3.14159"));
assert.ok(materialized.includes("BAD_VAL= missing_symbol + 10"));
assert.strictEqual(diagnostics.length, 1);
assert.strictEqual(diagnostics[0].severity, "error");
});
it("parses fixed 8-column BDF decks with blank fields and short-format exponents", () => {
const dialect = getFeaDialect("bdf");
// Standard fixed 8-character fields without commas
const fixedBdf = [
"$ Fixed 8-column deck",
"GRID " + " 1" + " " + " 0.0" + " 0.0" + " 0.0",
"GRID " + " 2" + " " + " 10.0" + " 0.0" + " 0.0",
"MAT1 " + " 1" + " 2.1+11" + " " + " 0.3" + " 7850.0",
"FORCE " + " 1" + " 2" + " 0" + " 500.0" + " 0.0" + " -1.0" + " 0.0",
"FORCE " + " 1" + " 2" + " 0" + " 200.0" + " 1.0" + " 0.0" + " 0.0",
"SPC1 " + " 1" + " 123456" + " 1" + " THRU" + " 2",
"ENDDATA",
].join("\n");
const parsed = dialect.parse(fixedBdf);
assert.strictEqual(parsed.nodes.size, 2);
assert.deepStrictEqual(parsed.nodes.get(1), { id: 1, x: 0.0, y: 0.0, z: 0.0 });
assert.deepStrictEqual(parsed.nodes.get(2), { id: 2, x: 10.0, y: 0.0, z: 0.0 });
const mat = parsed.materials.get("1");
assert.ok(mat);
assert.strictEqual(mat.E, 2.1e11);
// Accumulated forces on node 2: [200, -500, 0]
assert.deepStrictEqual(parsed.nodalLoads.get(2), [200.0, -500.0, 0.0]);
// SPC1 THRU range expansion
assert.ok(parsed.fixedNodes.has(1));
assert.ok(parsed.fixedNodes.has(2));
});
it("parses multiline element continuation, *ELSET, and *NSET GENERATE in INP decks", () => {
const dialect = getFeaDialect("inp");
const deck = `
*HEADING
Multiline Element and Sets Test
*NODE
1, 0.0, 0.0, 0.0
2, 1.0, 0.0, 0.0
3, 0.0, 1.0, 0.0
4, 0.0, 0.0, 1.0
*ELEMENT, TYPE=C3D10, ELSET=TETRA
1, 1, 2, 3, 4, 5, 6, 7, 8,
9, 10
*NSET, NSET=ROOT_NODES, GENERATE
1, 4, 1
*ELSET, ELSET=SOLID_PARTS
1
`;
const parsed = dialect.parse(deck);
assert.strictEqual(parsed.elements.size, 1);
const elem = parsed.elements.get(1);
assert.ok(elem);
assert.strictEqual(elem.type, "C3D10");
assert.strictEqual(elem.family, "solid");
assert.deepStrictEqual(elem.nodes, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
const nset = parsed.nodeSets.get("ROOT_NODES");
assert.ok(nset);
assert.strictEqual(nset.size, 4);
assert.ok(nset.has(1) && nset.has(2) && nset.has(3) && nset.has(4));
const elset = parsed.elementSets.get("SOLID_PARTS");
assert.ok(elset);
assert.ok(elset.has(1));
});
it("synthesizes moments and BDF boundaries and handles case-insensitive steps", () => {
const momentAction: BoundaryActionPayload = {
kind: "moment",
targetId: 10,
dofs: [5],
magnitude: 250.0,
};
const inpSnippet = synthesizeFeaBoundary(momentAction, "calculix");
assert.ok(inpSnippet.includes("*CLOAD"));
assert.ok(inpSnippet.includes("10, 5, 250"));
const bdfMomentVec = synthesizeFeaBoundary(
{ kind: "moment", targetId: 10, magnitude: 250.0, vector: [0.0, 1.0, 0.0] },
"bdf",
);
assert.strictEqual(bdfMomentVec, "MOMENT, 1, 10, 0, 250.00, 0.0000, 1.0000, 0.0000");
const bdfFixAction: BoundaryActionPayload = {
kind: "fix",
targetId: 101,
dofs: [1, 2, 3],
};
const bdfSnippet = synthesizeFeaBoundary(bdfFixAction, "bdf");
assert.strictEqual(bdfSnippet, "SPC1, 1, 123, 101");
const deckLower = `*HEADING\nPlate\n*step\n*static\n*end step\n`;
const updated = applyBoundaryActionToDeck(deckLower, momentAction, "calculix");
assert.ok(updated.includes("*CLOAD\n10, 5, 250"));
assert.ok(updated.indexOf("*CLOAD") < updated.toLowerCase().indexOf("*end step"));
});
it("assembles and solves 3D linear elasticity stiffness K*u=F to compute mass, nodal displacements, and Von Mises stress", () => {
const tetDeck = `*HEADING
3D Tetrahedron Linear Elasticity Test
*NODE
1, 0.0, 0.0, 0.0
2, 0.1, 0.0, 0.0
3, 0.0, 0.1, 0.0
4, 0.0, 0.0, 0.1
*ELEMENT, TYPE=C3D4, ELSET=EALL
1, 1, 2, 3, 4
*MATERIAL, NAME=ALUMINUM
*ELASTIC
7.0e10, 0.33
*DENSITY
2700.0
*PLASTIC
250.0e6, 0.0
*BOUNDARY
1, 1, 3, 0.0
2, 1, 3, 0.0
3, 1, 3, 0.0
*STEP
*STATIC
*CLOAD
4, 3, 5000.0
*END STEP
`;
const props = extractFeaSlicingProperties(tetDeck);
// Exact volume of right tetrahedron with legs 0.1m = (0.1^3)/6 = 1.6667e-4 m^3
assert.ok(props.totalVolumeM3 !== undefined && Math.abs(props.totalVolumeM3 - 1e-3 / 6) < 1e-8);
// Exact mass = 2700 * (1e-3 / 6) = 0.45 kg
assert.strictEqual(props.mass, 0.45);
assert.strictEqual(props.yieldStrengthPa, 250.0e6);
assert.ok(props.maxDisplacementM !== undefined && props.maxDisplacementM > 0);
assert.ok(props.maxVonMisesPa > 0);
assert.ok(props.nodalDisplacements && props.nodalDisplacements[4]![2] > 0);
assert.ok(props.elementVonMisesPa && props.elementVonMisesPa[1]! > 0);
});
it("parses *PLASTIC yield strength, prescribed *BOUNDARY displacements, and multi-line BDF CTETRA/CHEXA continuations", () => {
const inpDialect = getFeaDialect("inp");
const inpDeck = `*HEADING
Plastic and Prescribed Boundary Test
*NODE
1, 0.0, 0.0, 0.0
2, 1.0, 0.0, 0.0
*MATERIAL, NAME=TI6AL4V
*ELASTIC
1.14e11, 0.34
*PLASTIC
880.0e6, 0.0
*BOUNDARY
1, 1, 3, 0.0
2, 3, 3, 0.0025
`;
const parsedInp = inpDialect.parse(inpDeck);
assert.strictEqual(parsedInp.materials.get("TI6AL4V")?.yieldStrength, 880.0e6);
assert.ok(parsedInp.fixedNodes.has(1));
assert.strictEqual(parsedInp.fixedNodes.has(2), false);
assert.deepStrictEqual(parsedInp.displacements?.get(2), [0, 0, 0.0025]);
const bdfDialect = getFeaDialect("bdf");
const bdfDeck = [
"$ Multi-line BDF continuation test",
"CTETRA, 10, 1, 1, 2, 3, 4, 5, 6, +CT10",
"+CT10, 7, 8, 9, 10",
"CHEXA, 20, 1, 1, 2, 3, 4, 5, 6, +CH20",
"+CH20, 7, 8",
"CHEXA, 21, 1, 1, 2, 3, 4, 5, 6, +CH21A",
"+CH21A, 7, 8, 9, 10, 11, 12, 13, 14, +CH21B",
"+CH21B, 15, 16, 17, 18, 19, 20",
"SPC, 1, 1, 123, 0.0, 2, 3, 0.005",
"ENDDATA",
].join("\n");
const parsedBdf = bdfDialect.parse(bdfDeck);
assert.deepStrictEqual(parsedBdf.elements.get(10)?.nodes, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
assert.deepStrictEqual(parsedBdf.elements.get(20)?.nodes, [1, 2, 3, 4, 5, 6, 7, 8]);
assert.strictEqual(parsedBdf.elements.get(21)?.nodes.length, 20);
assert.ok(parsedBdf.fixedDofs?.get(1)?.has(1) && parsedBdf.fixedDofs?.get(1)?.has(3));
assert.deepStrictEqual(parsedBdf.displacements?.get(2), [0, 0, 0.005]);
});
it("solves C3D6 wedges, S3/S4 CST shells, T3D2/B31 bars, *DLOAD pressure on ELSET, and >500-node sparse PCG meshes", () => {
// 1. 6-node wedge (C3D6) under *DLOAD pressure on ELSET
const wedgeDeck = `*HEADING
Wedge Pressure Test
*NODE
1, 0.0, 0.0, 0.0
2, 1.0, 0.0, 0.0
3, 0.0, 1.0, 0.0
4, 0.0, 0.0, 1.0
5, 1.0, 0.0, 1.0
6, 0.0, 1.0, 1.0
*ELEMENT, TYPE=C3D6, ELSET=EWEDGE
1, 1, 2, 3, 4, 5, 6
*MATERIAL, NAME=STEEL
*ELASTIC
2.0e11, 0.3
*DENSITY
8000.0
*BOUNDARY
1, ENCASTRE
2, PINNED
3, ZSYMM
*STEP
*STATIC
*DLOAD
EWEDGE, P2, 1.0e6
*END STEP
`;
const wedgeProps = extractFeaSlicingProperties(wedgeDeck);
// Exact wedge volume = 0.5 * 1 * 1 * 1 = 0.5 m^3, mass = 0.5 * 8000 = 4000 kg
assert.ok(Math.abs((wedgeProps.totalVolumeM3 ?? 0) - 0.5) < 1e-8);
assert.strictEqual(wedgeProps.mass, 4000);
assert.ok(wedgeProps.maxVonMisesPa > 0.5e6 && wedgeProps.maxVonMisesPa < 5.0e6);
// 2. S4 Quad Shell CST membrane under in-plane tension
const shellDeck = `*HEADING
Quad Shell Membrane Tension
*NODE, NSET=LEFT
1, 0.0, 0.0, 0.0
4, 0.0, 1.0, 0.0
*NODE, NSET=RIGHT
2, 1.0, 0.0, 0.0
3, 1.0, 1.0, 0.0
*ELEMENT, TYPE=S4, ELSET=EPLATE
1, 1, 2, 3, 4
*SHELL SECTION, ELSET=EPLATE, MATERIAL=ALU
0.01
*MATERIAL, NAME=ALU
*ELASTIC
7.0e10, 0.3
*DENSITY
2700.0
*BOUNDARY
1, 1, 3, 0.0
4, 1, 1, 0.0
4, 3, 3, 0.0
*STEP
*STATIC
*CLOAD
RIGHT, 1, 5000.0
*END STEP
`;
const shellProps = extractFeaSlicingProperties(shellDeck);
// NSET=RIGHT has 2 nodes, each receiving 5000 N -> total F_x = 10000 N across cross-section 1.0m * 0.01m = 0.01 m^2 -> sigma_xx = 1.0 MPa
assert.strictEqual(shellProps.mass, 27);
assert.ok(Math.abs(shellProps.maxVonMisesPa - 1.0e6) < 1e4);
// 3. T3D2 Truss bar under prescribed axial displacement + >500-node sparse PCG chain
const lines: string[] = ["*HEADING", "Large Sparse Bar Chain", "*NODE"];
const numChainNodes = 550;
for (let i = 1; i <= numChainNodes; i++) {
lines.push(`${i}, ${(i - 1) * 0.01}, 0.0, 0.0`);
}
lines.push("*ELEMENT, TYPE=T3D2, ELSET=EBARS");
for (let i = 1; i < numChainNodes; i++) {
lines.push(`${i}, ${i}, ${i + 1}`);
}
lines.push(
"*SOLID SECTION, ELSET=EBARS, MATERIAL=STEEL",
"0.0001",
"*MATERIAL, NAME=STEEL",
"*ELASTIC",
"2.0e11, 0.3",
"*DENSITY",
"7850.0",
"*BOUNDARY",
"1, 1, 3, 0.0",
`${numChainNodes}, 1, 1, 0.00549`,
);
const largeProps = extractFeaSlicingProperties(lines.join("\n"));
assert.strictEqual(largeProps.nodeCount, numChainNodes);
assert.ok((largeProps.maxDisplacementM ?? 0) >= 0.0054);
assert.ok(largeProps.maxVonMisesPa > 1.0e8);
});
});
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