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Checkmesh shows fault in snappyhexmeshed pipe |
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July 12, 2012, 08:29 |
Checkmesh shows fault in snappyhexmeshed pipe
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#1 |
New Member
Senol
Join Date: Aug 2011
Posts: 7
Rep Power: 15 |
Hi dear foamers;
I made a pipe in Solidworks and built mesh with snappyhexmesh. It has three parts inlet outler and cylinder, i am studying on internal flow. I tried to solve with icoFoam but courant number gets higher step by step, so i used checkmesh. I guess the problem is about mesh, because when i run checkmesh it says "Failed 1 mesh checks". Can somebody help me if this following file shows that the problem is about the mesh and how can i solve it. Also if there is a problem in mesh which line shows the problem. thanks all. Senol. /*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.1.1 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ Build : 2.1.1-221db2718bbb Exec : checkMesh Date : Jul 12 2012 Time : 14:05:22 Host : "ubuntu" PID : 10203 Case : /home/akkus/OpenFOAM/akkus-2.1.1/run/tutorials/mesh/snappyHexMesh/cylinder nProcs : 1 sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). fileModificationChecking : Monitoring run-time modified files using timeStampMaster allowSystemOperations : Disallowing user-supplied system call operations // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Create polyMesh for time = 0 Time = 0 Mesh stats points: 188693 faces: 478963 internal faces: 431013 cells: 145288 boundary patches: 4 point zones: 0 face zones: 0 cell zones: 0 Overall number of cells of each type: hexahedra: 120193 prisms: 9693 wedges: 0 pyramids: 0 tet wedges: 86 tetrahedra: 0 polyhedra: 15316 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 allBoundary 0 0 ok (empty) montajSilindir_Montaj1-silindir-128917 29573 ok (non-closed singly connected) montajİnlet_Montaj1-inlet-19572 9808 ok (non-closed singly connected) montajOutlet_Montaj1-outlet-19461 9695 ok (non-closed singly connected) Checking geometry... Overall domain bounding box (0.0050909 0.00519532 0.0001005) (0.0250449 0.0251742 0.100101) Mesh (non-empty, non-wedge) directions (1 1 1) Mesh (non-empty) directions (1 1 1) Boundary openness (-1.18841e-15 9.16711e-16 1.90025e-16) OK. Max cell openness = 3.37214e-16 OK. Max aspect ratio = 30.2737 OK. Minumum face area = 1.03897e-08. Maximum face area = 5.15382e-06. Face area magnitudes OK. Min volume = 3.6838e-12. Max volume = 2.57697e-09. Total volume = 3.12138e-05. Cell volumes OK. Mesh non-orthogonality Max: 74.8039 average: 19.8508 *Number of severely non-orthogonal faces: 13552. Non-orthogonality check OK. <<Writing 13552 non-orthogonal faces to set nonOrthoFaces Face pyramids OK. ***Max skewness = 7.91641, 10 highly skew faces detected which may impair the quality of the results <<Writing 10 skew faces to set skewFaces Coupled point location match (average 0) OK. Failed 1 mesh checks. End |
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July 12, 2012, 12:12 |
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#2 |
Member
Eysteinn Helgason
Join Date: Sep 2009
Location: Gothenburg, Sweden
Posts: 53
Rep Power: 17 |
There are multiple things that can be wrong in the meshing process.
Here is some discussion on a pipe mesh and there is also a snappyHexMesh file there that you could take a look at and compare. You mention that your mesh is made up of 3 parts, inlet, outlet and cylinder. According to checkMesh there seem to be 4 boundary patches though. Maybe something you can check out in constant/polymesh/boundary. Hope this helps! |
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July 13, 2012, 15:12 |
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#3 | |
New Member
Senol
Join Date: Aug 2011
Posts: 7
Rep Power: 15 |
hi eynsteinn
I figured out that i designed blockmeshdict wrong, i redisigned and now everything is ok Quote:
Thanks for your interest. |
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Tags |
checkmesh, internal flow, pipe, snappyhexmesh |
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