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Running blockMesh
- Run blockMesh command in test case directory:
# cd $FOAM_RUN /pitzDaily
# blockMesh - Writes on the screen:
/*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: dev | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ Build : dev-e2ccbbbb Exec : blockMesh Date : Jun 16 2017 Time : 12:00:00 Host : $HOSTNAME PID : $$ Case : $FOAM_RUN/pitzDaily nProcs : 1 sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10) allowSystemOperations : Allowing user-supplied system call operations // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Creating block mesh from "$FOAM_RUN/pitzDaily/system/blockMeshDict" Creating block edges No non-planar block faces defined Creating topology blocks Creating topology patches Creating block mesh topology Check topology Basic statistics Number of internal faces : 5 Number of boundary faces : 20 Number of defined boundary faces : 20 Number of undefined boundary faces : 0 Checking patch -> block consistency Creating block offsets Creating merge list . Creating polyMesh from blockMesh Creating patches Creating cells Creating points with scale 0.001 Block 0 cell size : i : 0.00158284 .. 0.000791418 j : 0.000318841 .. 0.000420268 k : 0.001 .. 0.001 Block 1 cell size : i : 0.000528387 .. 0.00211355 j : 0.00112889 .. 0.000360188 k : 0.001 .. 0.001 Block 2 cell size : i : 0.000528387 .. 0.00211355 j : 0.000318841 .. 0.000420268 k : 0.001 .. 0.001 Block 3 cell size : i : 0.0020578 .. 0.00514451 j : 0.000940741 .. 0.000940741 k : 0.001 .. 0.001 Block 4 cell size : i : 0.0020466 .. 0.00511651 j : 0.00112889 .. 0.000257962 k : 0.001 .. 0.001 There are no merge patch pairs edges Writing polyMesh ---------------- Mesh Information ---------------- boundingBox: (-0.0206 -0.0254 -0.0005) (0.29 0.0254 0.0005) nPoints: 25012 nCells: 12225 nFaces: 49180 nInternalFaces: 24170 ---------------- Patches ---------------- patch 0 (start: 24170 size: 30) name: inlet patch 1 (start: 24200 size: 57) name: outlet patch 2 (start: 24257 size: 223) name: upperWall patch 3 (start: 24480 size: 250) name: lowerWall patch 4 (start: 24730 size: 24450) name: frontAndBack End - Command checkMesh checks the mesh and writes mesh information:
# checkMesh - Screen output:
/*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: dev | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ Build : dev-e2ccbbbb Exec : checkMesh Date : Jun 16 2017 Time : 12:00:00 Host : $HOSTNAME PID : $$ Case : $FOAM_RUN/pitzDaily nProcs : 1 sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10) allowSystemOperations : Allowing user-supplied system call operations // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create polyMesh for time = 0 Time = 0 Mesh stats points: 25012 internal points: 0 faces: 49180 internal faces: 24170 cells: 12225 faces per cell: 6 boundary patches: 5 point zones: 0 face zones: 0 cell zones: 0 Overall number of cells of each type: hexahedra: 12225 prisms: 0 wedges: 0 pyramids: 0 tet wedges: 0 tetrahedra: 0 polyhedra: 0 Checking topology... Boundary definition OK. Cell to face addressing OK. Point usage OK. Upper triangular ordering OK. Face vertices OK. Number of regions: 1 (OK). Checking patch topology for multiply connected surfaces... Patch Faces Points Surface topology inlet 30 62 ok (non-closed singly connected) outlet 57 116 ok (non-closed singly connected) upperWall 223 448 ok (non-closed singly connected) lowerWall 250 502 ok (non-closed singly connected) frontAndBack 24450 25012 ok (non-closed singly connected) Checking geometry... Overall domain bounding box (-0.0206 -0.0254 -0.0005) (0.29 0.0254 0.0005) Mesh has 2 geometric (non-empty/wedge) directions (1 1 0) Mesh has 2 solution (non-empty) directions (1 1 0) All edges aligned with or perpendicular to non-empty directions. Boundary openness (-1.74458e-19 3.10465e-18 2.11178e-15) OK. Max cell openness = 2.21044e-16 OK. Max aspect ratio = 8.1407 OK. Minimum face area = 1.68589e-07. Maximum face area = 5.14451e-06. Face area magnitudes OK. Min volume = 1.6902e-10. Max volume = 3.83579e-09. Total volume = 1.4516e-05. Cell volumes OK. Mesh non-orthogonality Max: 5.95045 average: 1.63034 Non-orthogonality check OK. Face pyramids OK. Max skewness = 0.260575 OK. Coupled point location match (average 0) OK. Mesh OK. End
is given by formula
is the power of the turbine, 
is the maximal theoretical power given by Betz’s law, 
is torque of the rotor and 
is angular velocity of the rotor, 
is density of air, 
is area covered by the rotor and 
is the velocity at inlet.