Agent skill
openfoam-51-y-verification
Sub-skill of openfoam: 5.1 y+ Verification (+5).
Install this agent skill to your Project
npx add-skill https://github.com/vamseeachanta/workspace-hub/tree/main/.claude/skills/_archive/engineering/cfd/openfoam/51-y-verification
SKILL.md
5.1 y+ Verification (+5)
5.1 y+ Verification
# Compute y+ post-hoc
simpleFoam -postProcess -func yPlus -latestTime
Or add to controlDict:
functions { #includeFunc yPlus }
Target y+ ranges:
| Approach | y+ target | When to use |
|---|---|---|
| Wall-resolved (low-Re) | < 1 | Accurate wall heat transfer, separation |
| Wall functions (high-Re) | 30-300 | Industrial flows, coarser meshes |
| Buffer layer (avoid) | 5-30 | Neither model accurate here |
5.2 Mass Conservation
Parse continuity errors from log:
time step continuity errors : sum local = 1.23e-07, global = -2.34e-15, cumulative = -5.67e-14
| Metric | Acceptable |
|---|---|
| sum local | < 1e-4 (typical: 1e-6 to 1e-8) |
| global | < 1e-10 (should be near machine precision) |
| cumulative | Should not grow unbounded |
5.3 Residual Convergence Criteria
Steady-state (simpleFoam):
| Field | Typical target | Tight target |
|---|---|---|
| p | initial residual < 1e-4 | < 1e-5 |
| U | initial residual < 1e-4 | < 1e-5 |
| k, epsilon, omega | initial residual < 1e-4 | < 1e-5 |
Convergence: residuals should decrease monotonically. Oscillating residuals indicate numerical issues.
Transient: Final residuals within each time step should reach solver tolerance. Initial residuals should not grow over successive time steps.
5.4 Benchmark Cases
Available locally at /usr/lib/openfoam/openfoam2312/tutorials/:
Lid-Driven Cavity (icoFoam):
# Path: tutorials/incompressible/icoFoam/cavity/cavity/
blockMesh && icoFoam
# Validates: PISO, basic BCs
# Expected: single primary vortex at Re=100, compare with Ghia et al. (1982)
Backward-Facing Step — pitzDaily (simpleFoam):
# Path: tutorials/incompressible/simpleFoam/pitzDaily/
blockMesh && simpleFoam
# Validates: SIMPLE, k-epsilon turbulence, wall functions
# Expected: reattachment at ~6-7 step heights downstream
Dam Break (interFoam):
# Path: tutorials/multiphase/interFoam/laminar/damBreak/damBreak/
blockMesh && setFields && interFoam
# Validates: VOF, free surface, interFoam
motorBike (simpleFoam + snappyHexMesh):
# Path: tutorials/incompressible/simpleFoam/motorBike/
# Full parallel workflow with snappyHexMesh
# Validates: complex geometry meshing, parallel execution, force coefficients
5.5 Function Objects for Monitoring
Include in controlDict functions {}:
| Name | Purpose |
|---|---|
#includeFunc yPlus |
Wall y+ field |
#includeFunc CourantNo |
Courant number field |
#includeFunc fieldMinMax |
Min/max of all fields |
#includeFunc solverInfo |
Residual data per timestep |
#includeFunc wallShearStress |
Wall shear stress |
#includeFunc vorticity |
Vorticity field |
#includeFunc Q |
Q criterion for vortex identification |
All function object templates at: /usr/lib/openfoam/openfoam2312/etc/caseDicts/postProcessing/
5.6 Export for ParaView
foamToVTK # all times -> VTK/ directory
foamToVTK -latestTime # latest only
foamToVTK -fields '(U p)' # specific fields
foamToVTK -time '100:200' # time range
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