OpenFOAM Chapter 4 (Section 5): Run blockMesh + Debug Errors (controlDict, polyMesh, hex fixes) скачать в хорошем качестве

OpenFOAM Chapter 4 (Section 5): Run blockMesh + Debug Errors (controlDict, polyMesh, hex fixes)

In OpenFOAM Chapter 4 — Section 5, we finally start running our scratch-built case. The focus is not only generating the mesh, but learning the most important OpenFOAM habit: ✅ Use error messages as your guide. We go through the real workflow CFD engineers use every day: build → run → read error → fix → run again What you’ll do in this section 1) Check the case structure (from scratch) Open terminal, load OpenFOAM (example: 23.06) Use tree to confirm we only have: system/blockMeshDict 2) Try running icoFoam and see what OpenFOAM says Run icoFoam OpenFOAM immediately reports the first missing file: ✅ system/controlDict not found 3) Fast workflow: copy missing dictionaries from a known tutorial Copy controlDict from a simple case (like cavity) Verify key settings (application, startTime, endTime, deltaT, writeInterval) 4) Run icoFoam again → next missing piece Now the error changes: ✅ no mesh / polyMesh not found That tells us the next step: ✅ run blockMesh 5) Run blockMesh and debug the hex error blockMesh points to the exact problematic hex block Typical causes: wrong vertex order wrong index mismatch in block definition We fix a real example mistake: incorrect extruded vertex index (e.g., 23 instead of 21) 6) Run blockMesh again and confirm mesh creation Successful output includes counts (points, faces, cells) and ends with: ✅ End tree now shows: ✅ constant/polyMesh 7) Quick sanity check in ParaView Run paraFoam → Apply Set Surface With Edges Confirm blocks and mesh layout visually (uniform for now using simpleGrading (1 1 1)) Key takeaway When building OpenFOAM cases from scratch, the solver and utilities tell you exactly what’s missing: controlDict missing → copy it polyMesh missing → run blockMesh hex error → fix indices/order mesh builds successfully Next section In Section 6, we improve mesh quality by: ✅ changing cell counts per block ✅ adjusting simpleGrading ✅ refining the mesh around the square cylinder