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Deep integration with computational fluid dynamics tools for internal and external flow analysis
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This skill should be used when the user asks to "find skills in the wild", "assimilate popular workflows", "discover SKILL.md files in repos", "research external skills", "find workflow patterns", "survey the skill landscape", "what skills exist out there", or wants to investigate public repositories for extractable processes, babysitter plugins, and reusable procedural insights. Searches GitHub for SKILL.md files, classifies repos by archetype, and maintains structured research under docs/reference-repos/.
Showing SKILL.md
| name | cfd-fluids |
| description | Deep integration with computational fluid dynamics tools for internal and external flow analysis |
| allowed-tools | ["Read","Write","Glob","Grep","Bash"] |
| metadata | {"specialization":"mechanical-engineering","domain":"science","category":"thermal-fluid-analysis","priority":"high","phase":1,"tools-libraries":["ANSYS Fluent","ANSYS CFX","OpenFOAM","Star-CCM+","ParaView"]} |
| graph | {"domains":["domain:mechanical-engineering"],"skillAreas":["skill-area:physics-simulation","skill-area:mathematical-reasoning","skill-area:motion-planning"],"roles":["role:systems-integration-engineer","role:research-engineer"]} |
The CFD Analysis skill provides deep integration with computational fluid dynamics tools for internal and external flow analysis, enabling systematic setup, execution, and post-processing of fluid simulations.
CAD Cleanup
Domain Definition
Mesh Types
| Type | Application | Pros/Cons |
|---|---|---|
| Structured hex | Simple geometries | High quality, more effort |
| Unstructured tet | Complex geometries | Flexible, more cells |
| Polyhedral | Complex internal | Good quality, moderate count |
| Hybrid | Mixed regions | Optimized for accuracy |
Boundary Layer Mesh
First cell height: y+ = 1 (wall-resolved)
y+ = 30-300 (wall functions)
y = y+ * mu / (rho * u_tau)
u_tau = sqrt(tau_w / rho)
Mesh Quality Criteria
Orthogonality: > 0.1 (> 0.3 preferred)
Skewness: < 0.95 (< 0.8 preferred)
Aspect ratio: < 100 (< 20 near walls)
| Model | Application | Wall Treatment |
|---|---|---|
| k-epsilon Standard | General industrial | Wall functions |
| k-epsilon Realizable | Rotation, separation | Wall functions |
| k-omega SST | Aerospace, separation | Low-Re or wall functions |
| Spalart-Allmaras | External aero | Low-Re |
| LES/DES | Unsteady, vortex shedding | Wall-resolved |
Inlet Conditions
Outlet Conditions
Wall Conditions
Discretization Schemes
Convection: Second-order upwind (accuracy)
First-order (stability)
Pressure: PRESTO (complex geometry)
Standard (simple geometry)
Convergence Criteria
Residuals: < 1e-4 (typical)
< 1e-6 (high accuracy)
Monitor: Mass imbalance < 0.1%
Force convergence
Flow Visualization
Quantitative Results
{
"geometry": "CAD file path",
"flow_type": "internal|external",
"fluid": {
"name": "string",
"density": "number (kg/m3)",
"viscosity": "number (Pa.s)",
"specific_heat": "number (J/kg.K, if thermal)"
},
"inlet": {
"type": "velocity|mass_flow|pressure",
"value": "number",
"temperature": "number (K, if thermal)"
},
"outlet": {
"type": "pressure|outflow",
"value": "number (if pressure)"
},
"analysis_type": "steady|transient",
"turbulence_model": "k-epsilon|k-omega-sst|spalart-allmaras|laminar"
}
{
"flow_results": {
"pressure_drop": "number (Pa)",
"flow_coefficient": "number (Cv)",
"max_velocity": "number (m/s)",
"reynolds_number": "number"
},
"forces": {
"drag": "number (N)",
"lift": "number (N)",
"moment": "array [Mx, My, Mz]"
},
"thermal_results": {
"heat_transfer_rate": "number (W)",
"average_htc": "number (W/m2.K)",
"outlet_temperature": "number (K)"
},
"mesh_statistics": {
"cell_count": "number",
"y_plus_range": [min, max],
"orthogonality_min": "number"
},
"convergence": {
"iterations": "number",
"residuals": "object",
"mass_imbalance": "number"
}
}
Based on SOC occupation classification
