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[CGNS] checkMesh Error - Number of regions: 5 |
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March 9, 2011, 14:33 |
checkMesh Error - Number of regions: 5
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#1 |
Member
sirLentschi
Join Date: Nov 2010
Posts: 79
Rep Power: 15 |
Hello everyone,
I have a problem with checkMesh so I hope someone can help me. At first I created a mesh of a pump, which consists of draftube,runner,guide vanes, spiral casing and nose part. These 5 sub-meshes are connected with each other by ggi (in CFX). Then I exported only the mesh as CGNS and converted it into a foam-compatible-one with cgnsToFoam. Now, CheckMesh visualises following Log: /*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM Extend Project: Open source CFD | | \\ / O peration | Version: 1.6-ext | | \\ / A nd | Web: www.extend-project.de | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ Build : 1.6-ext Exec : checkMesh Date : Mar 09 2011 Time : 15:38:31 SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create polyMesh for time = 0 Time = 0 Mesh stats points: 13415417 faces: 39084423 internal faces: 37938651 cells: 12837179 boundary patches: 17 point zones: 0 face zones: 0 cell zones: 1 Overall number of cells of each type: hexahedra: 12837179 prisms: 0 wedges: 0 pyramids: 0 tet wedges: 0 tetrahedra: 0 polyhedra: 0 Checking topology... Boundary definition OK. Point usage OK. Upper triangular ordering OK. Face vertices OK. *Number of regions: 5 The mesh has multiple regions which are not connected by any face. <<Writing region information to "0/cellToRegion" Checking patch topology for multiply connected surfaces ... Patch Faces Points Surface topology DT_to_RU_Side_1 6720 6817 ok (non-closed singly connected) DT_to_RU_Side_2 24057 24301 ok (non-closed singly connected) Inflow 8620 8742 ok (non-closed singly connected) NOSE_LOWER_Side_1 6698 6930 ok (non-closed singly connected) NOSE_LOWER_Side_2 6732 6965 ok (non-closed singly connected) NOSE_UPPER_Side_1 6698 6930 ok (non-closed singly connected) NOSE_UPPER_Side_2 6800 7035 ok (non-closed singly connected) Outflow 5126 5240 ok (non-closed singly connected) RU_to_SVWG_Side_1 16524 17010 ok (non-closed singly connected) RU_to_SVWG_Side_2 32708 33740 ok (non-closed singly connected) SVWG_to_SC_Side_1 38624 39865 ok (non-closed singly connected) SVWG_to_SC_Side_2 17600 18003 ok (non-closed singly connected) WallRot_RU 161829 162541 ok (non-closed singly connected) WallStat_DT 60370 60585 ok (non-closed singly connected) WallStat_RU 28674 30132 ok (non-closed singly connected) WallStat_SC 75666 76181 ok (non-closed singly connected) WallStat_SVWG 642326 645167 ok (non-closed singly connected) Checking geometry... This is a 3-D mesh Overall domain bounding box (-0.551782 -0.722608 -1.13494) (2.40857 0.611412 0.21191) Mesh (non-empty, non-wedge) directions (1 1 1) Mesh (non-empty) directions (1 1 1) Mesh (non-empty, non-wedge) dimensions 3 Boundary openness (-6.81145e-16 -5.32293e-16 1.79185e-17) Threshold = 1e-06 OK. ***High aspect ratio cells found, Max aspect ratio: 1483.03, number of cells 3629 Threshold = 1000 Writing 3629 cells with high aspect ratio to set highAspectRatioCells Minumum face area = 5.68587e-10. Maximum face area = 0.000732129. Face area magnitudes OK. Min volume = 1.11295e-13. Max volume = 6.52634e-06. Total volume = 1.18124. Cell volumes OK. Mesh non-orthogonality Max: 79.6113 average: 23.0032 Threshold = 70 *Number of severely non-orthogonal faces: 132299. Non-orthogonality check OK. Writing 132299 non-orthogonal faces to set nonOrthoFaces Face pyramids OK. Max skewness = 3.70244 OK. Failed 1 mesh checks. End The high aspect ratio is no problem because I get a finer mesh too, which inhibit this warning (or is this warning the visualised error??). But I do not know how to eliminate the Error "Number of regions: 5 The mesh has multiple regions which are not connected by any face. Why are there 5 disconnect regions?...I adapted my "boundary" file in the constant/polymesh directory to define all boundaries and connected the sub-meshes with each other by ggi. Here is my boundary file: /*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM Extend Project: Open source CFD | | \\ / O peration | Version: 1.6-ext | | \\ / A nd | Web: www.extend-project.de | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format binary; class polyBoundaryMesh; location "constant/polyMesh"; object boundary; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 17 ( DT_to_RU_Side_1 { type ggi; nFaces 6720; startFace 37938651; shadowPatch DT_to_RU_Side_2; zone DT_to_RU_Side_1_Zone; bridgeOverlap false; } DT_to_RU_Side_2 { type ggi; nFaces 24057; startFace 37945371; shadowPatch DT_to_RU_Side_1; zone DT_to_RU_Side_2_Zone; bridgeOverlap false; } Inflow { type patch; nFaces 8620; startFace 37969428; } NOSE_LOWER_Side_1 { type ggi; nFaces 6698; startFace 37978048; shadowPatch NOSE_LOWER_Side_2; zone NOSE_LOWER_Side_1_Zone; bridgeOverlap false; } NOSE_LOWER_Side_2 { type ggi; nFaces 6732; startFace 37984746; shadowPatch NOSE_LOWER_Side_1; zone NOSE_LOWER_Side_2_Zone; bridgeOverlap false; } NOSE_UPPER_Side_1 { type ggi; nFaces 6698; startFace 37991478; shadowPatch NOSE_UPPER_Side_2; zone NOSE_UPPER_Side_1_Zone; bridgeOverlap false; } NOSE_UPPER_Side_2 { type ggi; nFaces 6800; startFace 37998176; shadowPatch NOSE_UPPER_Side_1; zone NOSE_UPPER_Side_2_Zone; bridgeOverlap false; } Outflow { type patch; nFaces 5126; startFace 38004976; } RU_to_SVWG_Side_1 { type ggi; nFaces 16524; startFace 38010102; shadowPatch RU_to_SVWG_Side_2; zone RU_to_SVWG_Side_1_Zone; bridgeOverlap false; } RU_to_SVWG_Side_2 { type ggi; nFaces 32708; startFace 38026626; shadowPatch RU_to_SVWG_Side_1; zone RU_to_SVWG_Side_2_Zone; bridgeOverlap false; } SVWG_to_SC_Side_1 { type ggi; nFaces 38624; startFace 38059334; shadowPatch SVWG_to_SC_Side_2; zone SVWG_to_SC_Side_1_Zone; bridgeOverlap false; } SVWG_to_SC_Side_2 { type ggi; nFaces 17600; startFace 38097958; shadowPatch SVWG_to_SC_Side_1; zone SVWG_to_SC_Side_2_Zone; bridgeOverlap false; } WallRot_RU { type wall; nFaces 161829; startFace 38115558; } WallStat_DT { type wall; nFaces 60370; startFace 38277387; } WallStat_RU { type wall; nFaces 28674; startFace 38337757; } WallStat_SC { type wall; nFaces 75666; startFace 38366431; } WallStat_SVWG { type wall; nFaces 642326; startFace 38442097; } ) // ************************************************** *********************** // Can anyone tell me how to eliminate this error or can give me some tips? Thanks in advance. Regards Markus |
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March 11, 2011, 04:35 |
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#2 |
Member
sirLentschi
Join Date: Nov 2010
Posts: 79
Rep Power: 15 |
No problem - the separated regions are only warnings!
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