shm对于blockMesh和gmsh生成的背景网格计算时长不同
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blockMesh生成的背景网格用snappyHexMesh添加边界层的信息如下,用时30s
Create time Create mesh for time = 0 Read mesh in = 0.24 s Using #calc at line 24 in file "/home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0/system/snappyHexMeshDict" Using #codeStream with "/home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0/dynamicCode/platforms/linux64GccDPInt32Opt/lib/libcodeStream_144513f76453493486a3a7dac85dde895435431d.so" Could not load "/home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0/dynamicCode/platforms/linux64GccDPInt32Opt/lib/libcodeStream_144513f76453493486a3a7dac85dde895435431d.so" /home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0/dynamicCode/platforms/linux64GccDPInt32Opt/lib/libcodeStream_144513f76453493486a3a7dac85dde895435431d.so: cannot open shared object file: No such file or directory Creating new library in "dynamicCode/_144513f76453493486a3a7dac85dde895435431d/platforms/linux64GccDPInt32Opt/lib/libcodeStream_144513f76453493486a3a7dac85dde895435431d.so" Invoking wmake libso /home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0/dynamicCode/_144513f76453493486a3a7dac85dde895435431d wmake libso /home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0/dynamicCode/_144513f76453493486a3a7dac85dde895435431d ln: ./lnInclude dep: codeStreamTemplate.C Ctoo: codeStreamTemplate.C ld: /home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0/dynamicCode/_144513f76453493486a3a7dac85dde895435431d/../platforms/linux64GccDPInt32Opt/lib/libcodeStream_144513f76453493486a3a7dac85dde895435431d.so Overall mesh bounding box : (0 0 0) (192 1 90) Relative tolerance : 1e-06 Absolute matching distance : 0.00021205 Reading refinement surfaces. --> FOAM Warning : From function Foam::refinementSurfaces::refinementSurfaces(const Foam::searchableSurfaces&, const Foam::dictionary&, Foam::label, bool) in file refinementSurfaces/refinementSurfaces.C at line 418 Reading "/home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0/system/snappyHexMeshDict.castellatedMeshControls.refinementSurfaces" Not all entries in refinementSurfaces dictionary were used. The following entries were not used : 1(roof) Read refinement surfaces in = 0 s Reading refinement shells. Read refinement shells in = 0 s Setting refinement level of surface to be consistent with shells. Checked shell refinement in = 0 s Reading features. Read features in = 0 s Determining initial surface intersections ----------------------------------------- Edge intersection testing: Number of edges : 246036 Number of edges to retest : 0 Number of intersected edges : 0 Edge intersection testing: Number of edges : 246036 Number of edges to retest : 246036 Number of intersected edges : 0 Calculated surface intersections in = 0.16 s Initial mesh : cells:61380 faces:246036 points:123794 Cells per refinement level: 0 61380 Adding patches for surface regions ---------------------------------- Patch Type Region ----- ---- ------ Added patches in = 0 s Edge intersection testing: Number of edges : 246036 Number of edges to retest : 0 Number of intersected edges : 0 Selecting decompositionMethod none [1] Layer thickness specified as first layer and expansion ratio. Shrinking and layer addition phase ---------------------------------- Using mesh parameters { maxNonOrtho 65; maxBoundarySkewness 20; maxInternalSkewness 4; maxConcave 80; minVol 1e-13; minTetQuality 1e-15; minArea -1; minTwist 0.02; minDeterminant 0.001; minFaceWeight 0.02; minVolRatio 0.01; minTriangleTwist -1; nSmoothScale 4; errorReduction 0.75; } Merging all faces of a cell --------------------------- - which are on the same patch - which make an angle < 120 degrees (cos:-0.5) - as long as the resulting face doesn't become concave by more than 90 degrees (0=straight, 180=fully concave) Merging 0 sets of faces. No faces merged ... Merging all points on surface that - are used by only two boundary faces and - make an angle with a cosine of more than -0.5. No straight edges simplified and no points removed ... Checking mesh manifoldness ... Checking initial mesh ... Checking faces in error : non-orthogonality > 65 degrees : 0 faces with face pyramid volume < 1e-13 : 0 faces with face-decomposition tet quality < 1e-15 : 0 faces with concavity > 80 degrees : 0 faces with skewness > 4 (internal) or 20 (boundary) : 0 faces with interpolation weights (0..1) < 0.02 : 0 faces with volume ratio of neighbour cells < 0.01 : 0 faces with face twist < 0.02 : 0 faces on cells with determinant < 0.001 : 0 Detected 0 illegal faces (concave, zero area or negative cell pyramid volume) Duplicating 0 points on faceZones of type boundary Handling points with inconsistent layer specification ... dupNonManifoldPoints : Found : 0 non-manifold points (out of 123794) Adding in total 0 inter-processor patches to handle extrusion of non-manifold processor boundaries. Handling points with inconsistent layer specification ... Handling non-manifold points ... Checking patch manifoldness ... Outside of local patch is multiply connected across edges or points at 0 points. Set displacement to zero for all 0 non-manifold points Handling feature edges (angle < 120) ... Set displacement to zero for points on 0 feature edges Handling cells with warped patch faces ... Set displacement to zero on 0 warped faces since layer would be > 0.5 of the size of the bounding box. patch faces layers avg thickness[m] near-wall overall ----- ----- ------ --------- ------- down 330 10 0.0298 0.544 Selecting externalDisplacementMeshMover displacementMedialAxis displacementMedialAxis : Calculating distance to Medial Axis ... --> FOAM IOWarning : Found [v1712] 'minMedianAxisAngle' entry instead of 'minMedialAxisAngle' in dictionary "/home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0/system/snappyHexMeshDict.addLayersControls" This keyword is deemed to be 24 months old. fieldSmoother : Smoothing normals ... Iteration 0 residual 1.17395e-17 displacementMedialAxis : Inserting points on patch inlet if angle to nearest layer patch > 30 degrees. displacementMedialAxis : Inserting points on patch up if angle to nearest layer patch > 30 degrees. displacementMedialAxis : Inserting points on patch outlet if angle to nearest layer patch > 30 degrees. fieldSmoother : Smoothing normals in interior ... Iteration 0 residual 1.72658e-17 Layer addition iteration 0 -------------------------- Determining displacement for added points according to pointNormal ... Detected 0 points with point normal pointing through faces. Reset displacement at 0 points to average of surrounding points. displacementMedialAxis : Smoothing using Medial Axis ... displacementMedialAxis : Reducing layer thickness at 0 nodes where thickness to medial axis distance is large displacementMedialAxis : Removing isolated regions ... - if partially extruded faces make angle < 60 - if exclusively surrounded by non-extruded faces displacementMedialAxis : Number of isolated points extrusion stopped : 0 fieldSmoother : Smoothing field ... Iteration 0 residual 1.07333e-17 displacementMedialAxis : Moving mesh ... displacementMedialAxis : Iteration 0 Moving mesh using displacement scaling : min:1 max:1 Correcting 2-D mesh motion ...done Checking faces in error : non-orthogonality > 65 degrees : 0 faces with face pyramid volume < 1e-13 : 0 faces with face-decomposition tet quality < 1e-15 : 0 faces with concavity > 80 degrees : 0 faces with skewness > 4 (internal) or 20 (boundary) : 0 faces with interpolation weights (0..1) < 0.02 : 0 faces with volume ratio of neighbour cells < 0.01 : 0 faces with face twist < 0.02 : 0 faces on cells with determinant < 0.001 : 0 displacementMedialAxis : Successfully moved mesh displacementMedialAxis : Finished moving mesh ... truncateDisplacement : Unextruded 0 faces due to non-consecutive vertices being extruded. truncateDisplacement : Unextruded 0 faces due to stringed edges with inconsistent extrusion. Setting up information for layer truncation ... Detected 0 baffles across faceZones of type internal Checking mesh with layer ... Checking faces in error : non-orthogonality > 65 degrees : 0 faces with face pyramid volume < 1e-13 : 0 faces with face-decomposition tet quality < 1e-15 : 0 faces with concavity > 80 degrees : 0 faces with skewness > 4 (internal) or 20 (boundary) : 0 faces with interpolation weights (0..1) < 0.02 : 0 faces with volume ratio of neighbour cells < 0.01 : 0 faces with face twist < 0.02 : 0 faces on cells with determinant < 0.001 : 0 Detected 0 illegal faces (concave, zero area or negative cell pyramid volume) Extruding 330 out of 330 faces (100%). Removed extrusion at 0 faces. Added 3300 out of 3300 cells (100%). Edge intersection testing: Number of edges : 259246 Number of edges to retest : 0 Number of intersected edges : 0 patch faces layers overall thickness [m] [%] ----- ----- ------ --- --- down 330 10 0.544 100 Writing 3300 added cells to cellSet addedCells Writing 2970 faces inside added layer to faceSet layerFaces Writing fields with layer information: nSurfaceLayers : actual number of layers thickness : overall layer thickness thicknessFraction : overall layer thickness (fraction of desired thickness) Layer mesh : cells:64680 faces:259246 points:130414 Cells per refinement level: 0 64680 Writing mesh to time constant Wrote mesh in = 30.25 s. Layers added in = 30.25 s. Checking final mesh ... Checking faces in error : non-orthogonality > 65 degrees : 0 faces with face pyramid volume < 1e-13 : 0 faces with face-decomposition tet quality < 1e-15 : 0 faces with concavity > 80 degrees : 0 faces with skewness > 4 (internal) or 20 (boundary) : 0 faces with interpolation weights (0..1) < 0.02 : 0 faces with volume ratio of neighbour cells < 0.01 : 0 faces with face twist < 0.02 : 0 faces on cells with determinant < 0.001 : 0 Finished meshing without any errors Finished meshing in = 30.82 s. End -
gmsh生成的背景网格用snappyHexMesh添加边界层的信息如下，用时3s
Create time Create mesh for time = 0 Read mesh in = 0.41 s Using #calc at line 24 in file "/home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0copy/system/snappyHexMeshDict" Using #codeStream with "/home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0copy/dynamicCode/platforms/linux64GccDPInt32Opt/lib/libcodeStream_144513f76453493486a3a7dac85dde895435431d.so" Overall mesh bounding box : (0 0 0) (192 1 90) Relative tolerance : 1e-06 Absolute matching distance : 0.00021205 Reading refinement surfaces. --> FOAM Warning : From function Foam::refinementSurfaces::refinementSurfaces(const Foam::searchableSurfaces&, const Foam::dictionary&, Foam::label, bool) in file refinementSurfaces/refinementSurfaces.C at line 418 Reading "/home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0copy/system/snappyHexMeshDict.castellatedMeshControls.refinementSurfaces" Not all entries in refinementSurfaces dictionary were used. The following entries were not used : 1(roof) Read refinement surfaces in = 0 s Reading refinement shells. Read refinement shells in = 0 s Setting refinement level of surface to be consistent with shells. Checked shell refinement in = 0 s Reading features. Read features in = 0 s Determining initial surface intersections ----------------------------------------- Edge intersection testing: Number of edges : 406712 Number of edges to retest : 0 Number of intersected edges : 0 Edge intersection testing: Number of edges : 406712 Number of edges to retest : 406712 Number of intersected edges : 0 Calculated surface intersections in = 0.28 s Initial mesh : cells:101504 faces:406712 points:204402 Cells per refinement level: 0 101504 Adding patches for surface regions ---------------------------------- Patch Type Region ----- ---- ------ Added patches in = 0 s Edge intersection testing: Number of edges : 406712 Number of edges to retest : 0 Number of intersected edges : 0 Selecting decompositionMethod none [1] Layer thickness specified as first layer and expansion ratio. Shrinking and layer addition phase ---------------------------------- Using mesh parameters { maxNonOrtho 65; maxBoundarySkewness 20; maxInternalSkewness 4; maxConcave 80; minVol 1e-13; minTetQuality 1e-15; minArea -1; minTwist 0.02; minDeterminant 0.001; minFaceWeight 0.02; minVolRatio 0.01; minTriangleTwist -1; nSmoothScale 4; errorReduction 0.75; } Merging all faces of a cell --------------------------- - which are on the same patch - which make an angle < 120 degrees (cos:-0.5) - as long as the resulting face doesn't become concave by more than 90 degrees (0=straight, 180=fully concave) Merging 0 sets of faces. No faces merged ... Merging all points on surface that - are used by only two boundary faces and - make an angle with a cosine of more than -0.5. No straight edges simplified and no points removed ... Checking mesh manifoldness ... Checking initial mesh ... Checking faces in error : non-orthogonality > 65 degrees : 0 faces with face pyramid volume < 1e-13 : 0 faces with face-decomposition tet quality < 1e-15 : 0 faces with concavity > 80 degrees : 0 faces with skewness > 4 (internal) or 20 (boundary) : 0 faces with interpolation weights (0..1) < 0.02 : 0 faces with volume ratio of neighbour cells < 0.01 : 0 faces with face twist < 0.02 : 0 faces on cells with determinant < 0.001 : 0 Detected 0 illegal faces (concave, zero area or negative cell pyramid volume) Duplicating 0 points on faceZones of type boundary Handling points with inconsistent layer specification ... dupNonManifoldPoints : Found : 0 non-manifold points (out of 204402) Adding in total 0 inter-processor patches to handle extrusion of non-manifold processor boundaries. Handling points with inconsistent layer specification ... Handling non-manifold points ... Checking patch manifoldness ... Outside of local patch is multiply connected across edges or points at 0 points. Set displacement to zero for all 0 non-manifold points Handling feature edges (angle < 120) ... Set displacement to zero for points on 0 feature edges Handling cells with warped patch faces ... Set displacement to zero on 0 warped faces since layer would be > 0.5 of the size of the bounding box. patch faces layers avg thickness[m] near-wall overall ----- ----- ------ --------- ------- down 488 10 0.03 0.547 Selecting externalDisplacementMeshMover displacementMedialAxis displacementMedialAxis : Calculating distance to Medial Axis ... --> FOAM IOWarning : Found [v1712] 'minMedianAxisAngle' entry instead of 'minMedialAxisAngle' in dictionary "/home/saumuel/OpenFOAM/saumuel-v1912/run/flatSnowDrift/blockMesh0copy/system/snappyHexMeshDict.addLayersControls" This keyword is deemed to be 24 months old. fieldSmoother : Smoothing normals ... Iteration 0 residual 1.06709e-17 displacementMedialAxis : Inserting points on patch frontAndBack if angle to nearest layer patch > 30 degrees. displacementMedialAxis : Inserting points on patch inlet if angle to nearest layer patch > 30 degrees. displacementMedialAxis : Inserting points on patch outlet if angle to nearest layer patch > 30 degrees. displacementMedialAxis : Inserting points on patch up if angle to nearest layer patch > 30 degrees. fieldSmoother : Smoothing normals in interior ... Iteration 0 residual 1.55283e-17 Layer addition iteration 0 -------------------------- Determining displacement for added points according to pointNormal ... Detected 0 points with point normal pointing through faces. Reset displacement at 0 points to average of surrounding points. displacementMedialAxis : Smoothing using Medial Axis ... displacementMedialAxis : Reducing layer thickness at 0 nodes where thickness to medial axis distance is large displacementMedialAxis : Removing isolated regions ... - if partially extruded faces make angle < 60 - if exclusively surrounded by non-extruded faces displacementMedialAxis : Number of isolated points extrusion stopped : 0 fieldSmoother : Smoothing field ... Iteration 0 residual 1.24872e-17 displacementMedialAxis : Moving mesh ... displacementMedialAxis : Iteration 0 Moving mesh using displacement scaling : min:1 max:1 Checking faces in error : non-orthogonality > 65 degrees : 0 faces with face pyramid volume < 1e-13 : 0 faces with face-decomposition tet quality < 1e-15 : 0 faces with concavity > 80 degrees : 0 faces with skewness > 4 (internal) or 20 (boundary) : 0 faces with interpolation weights (0..1) < 0.02 : 0 faces with volume ratio of neighbour cells < 0.01 : 0 faces with face twist < 0.02 : 0 faces on cells with determinant < 0.001 : 0 displacementMedialAxis : Successfully moved mesh displacementMedialAxis : Finished moving mesh ... truncateDisplacement : Unextruded 0 faces due to non-consecutive vertices being extruded. truncateDisplacement : Unextruded 0 faces due to stringed edges with inconsistent extrusion. Setting up information for layer truncation ... Detected 0 baffles across faceZones of type internal Checking mesh with layer ... Checking faces in error : non-orthogonality > 65 degrees : 0 faces with face pyramid volume < 1e-13 : 0 faces with face-decomposition tet quality < 1e-15 : 0 faces with concavity > 80 degrees : 0 faces with skewness > 4 (internal) or 20 (boundary) : 0 faces with interpolation weights (0..1) < 0.02 : 0 faces with volume ratio of neighbour cells < 0.01 : 0 faces with face twist < 0.02 : 0 faces on cells with determinant < 0.001 : 0 Detected 0 illegal faces (concave, zero area or negative cell pyramid volume) Extruding 488 out of 488 faces (100%). Removed extrusion at 0 faces. Added 4880 out of 4880 cells (100%). Edge intersection testing: Number of edges : 426242 Number of edges to retest : 0 Number of intersected edges : 0 patch faces layers overall thickness [m] [%] ----- ----- ------ --- --- down 488 10 0.547 100 Writing 4880 added cells to cellSet addedCells Writing 4392 faces inside added layer to faceSet layerFaces Writing fields with layer information: nSurfaceLayers : actual number of layers thickness : overall layer thickness thicknessFraction : overall layer thickness (fraction of desired thickness) Layer mesh : cells:106384 faces:426242 points:214182 Cells per refinement level: 0 106384 Writing mesh to time 0.01 Wrote mesh in = 2.52 s. Layers added in = 2.52 s. Checking final mesh ... Checking faces in error : non-orthogonality > 65 degrees : 0 faces with face pyramid volume < 1e-13 : 0 faces with face-decomposition tet quality < 1e-15 : 0 faces with concavity > 80 degrees : 0 faces with skewness > 4 (internal) or 20 (boundary) : 0 faces with interpolation weights (0..1) < 0.02 : 0 faces with volume ratio of neighbour cells < 0.01 : 0 faces with face twist < 0.02 : 0 faces on cells with determinant < 0.001 : 0 Finished meshing without any errors Finished meshing in = 3.49 s. End -
用diff比较了差异，选取了主要的差异出来。<是blockMesh的，>是gmsh的。
Gmsh的背景网格比BlockMesh的还要多，但是shm用时却少了很多。如果需要的话。我可以严格控制两套网格基本一致，提供给大家用于shm试验44c35 < Number of edges : 246036 --- > Number of edges : 406712 48,49c39,40 < Number of edges : 246036 < Number of edges to retest : 246036 --- > Number of edges : 406712 > Number of edges to retest : 406712 51c42 < Calculated surface intersections in = 0.16 s --- > Calculated surface intersections in = 0.28 s 53c44 < Initial mesh : cells:61380 faces:246036 points:123794 --- > Initial mesh : cells:101504 faces:406712 points:204402 55c46 < 0 61380 --- > 0 101504 65c56 < Number of edges : 246036 --- > Number of edges : 406712 128c119 < dupNonManifoldPoints : Found : 0 non-manifold points (out of 123794) --- > dupNonManifoldPoints : Found : 0 non-manifold points (out of 204402) 149c140 < down 330 10 0.0298 0.544 --- > down 488 10 0.03 0.547 216,217c207,208 < Extruding 330 out of 330 faces (100%). Removed extrusion at 0 faces. < Added 3300 out of 3300 cells (100%). --- > Extruding 488 out of 488 faces (100%). Removed extrusion at 0 faces. > Added 4880 out of 4880 cells (100%). 219c210 < Number of edges : 259246 --- > Number of edges : 426242 226c217 < down 330 10 0.544 100 --- > down 488 10 0.547 100 228,229c219,220 < Writing 3300 added cells to cellSet addedCells < Writing 2970 faces inside added layer to faceSet layerFaces --- > Writing 4880 added cells to cellSet addedCells > Writing 4392 faces inside added layer to faceSet layerFaces 236c227 < Layer mesh : cells:64680 faces:259246 points:130414 --- > Layer mesh : cells:106384 faces:426242 points:214182 238,241c229,232 < 0 64680 < Writing mesh to time constant < Wrote mesh in = 30.25 s. < Layers added in = 30.25 s. --- > 0 106384 > Writing mesh to time 0.01 > Wrote mesh in = 2.52 s. > Layers added in = 2.52 s. 254c245,246 < Finished meshing in = 30.82 s. \ 文件尾没有换行符 --- > Finished meshing in = 3.49 s. > End \ 文件尾没有换行符 -
@李东岳 链接：
https://pan.baidu.com/s/13TAxxBcLouq7SGAj5kdtOw
提取码：zkmi
解压缩后有两个文件夹，一个叫gmsh，一个叫blockMesh，constant里面的网格是用两种方法分别生成好的背景网格，只需运行snappyHexMesh即可。snappyHexMesh里面只打开了addlayers，是给down边界加一个十层的边界层。gmsh和blockMesh的shm文件完全一样。checkMesh应该可以发现gmsh和blockMesh网格计算域，网格数量，最小最大尺寸是差不多的。
但是根据我的shm处理时间，gmsh的只用了3秒，而blockMesh的用了110秒。。差距很大 -
@李东岳 有一个很大的发现，blockMesh的时候我设置了empty边界。然后shm的时候 "correcting 2-D motion"这个信息运算了很久。然后我把blockMesh里面的empty边界改成了patch，瞬间治愈!!!!!!!!!!现在blockMesh的shm时间也是3秒了。。。
原来用gmsh的时候是没法定义empty的，默认是patch边界！所以gmsh的shm信息里没有"correcting 2-D motion"这个信息，也没有相应的计算。
现在看来shm似乎面对2D网格（尽管是伪三维网格，厚度方向只有一层网格）的时候出现了一些问题。因此我建议shm的时候先不要设置empty，画完网格后再改边界类型。 -
@Samuel-Tu: 好， 但仍谢谢Tu兄的回复，Tu兄，辛苦了
