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October 12, 2011, 09:36 |
engineFoam new mesh problem
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#1 |
Member
Ayhan Eses
Join Date: Mar 2009
Posts: 35
Rep Power: 17 |
I run tutorial kivaTest case without fail.
I want to increase compression ratio value, like diesel engine, about 20. I converted existent kiva mesh (otape17) to OpenFoam mesh(polymesh) with kivaToFoam command. It is ok no problem. Then i converted OpenFoam mesh(polymesh) to a Fluent mesh(*.msh) with foamMeshToFluent command. It is ok no problem. I deleted polyMesh folder which in constant folder. This time I converted Fluent mesh(*.msh) to OpenFoam mesh(polymesh) to a by fluent3DMeshToFoam command. It is ok no problem. I execute engineFoam command. it runs without problem. Code:
kiva mesh ---->> OpenFoam mesh ---->> Fluent Mesh (otape17) (polyMesh) <<---- (*.msh) | | v engineFoam (works well) Code:
New Fluent Mesh ---->> New OpenFoam mesh xxxx engineFoam (New.msh) (polyMesh) (Failed) Code:
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create engine time Create mesh for time = -180 Selecting engineMesh layered --> FOAM FATAL ERROR: cannot find cylinderHead patch From function engineMesh::engineMesh(const IOobject& io) in file engineMesh/engineMesh/engineMesh.C at line 90. FOAM exiting In kivaToFoam command this problem solved by "Transfered xx faces from liner region to cylinder head" Code:
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create time Reading kiva grid from file "otape17" Finished reading KIVA file Transfered 500 faces from liner region to cylinder head Default patch type set to empty Writing polyMesh Writing cell zoning info to file: "/home/ayhan/OpenFOAM/ayhan-2.0.1/run/tutorials/combustion/engineFoam/kivaTest/constant/region0/cellZoning" End /opt/openfoam201/applications/utilities/mesh/conversion/kivaToFoam/readKivaGrid.H Code:
// Transfer liner faces that are above the minimum cylinder-head z height // into the cylinder-head region if ( pFaces[LINER].size() && pFaces[LINER][0].size() && pFaces[CYLINDERHEAD].size() && pFaces[CYLINDERHEAD][0].size() ) { scalar minz = GREAT; forAllConstIter(SLList<face>, pFaces[CYLINDERHEAD][0], iter) { const face& pf = iter(); forAll(pf, pfi) { minz = min(minz, points[pf[pfi]].z()); } } minz += SMALL; SLList<face> newLinerFaces; forAllConstIter(SLList<face>, pFaces[LINER][0], iter) { const face& pf = iter(); scalar minfz = GREAT; forAll(pf, pfi) { minfz = min(minfz, points[pf[pfi]].z()); } if (minfz > minz) { pFaces[CYLINDERHEAD][0].append(pf); } else { newLinerFaces.append(pf); } } if (pFaces[LINER][0].size() != newLinerFaces.size()) { Info<< "Transfered " << pFaces[LINER][0].size() - newLinerFaces.size() << " faces from liner region to cylinder head" << endl; pFaces[LINER][0] = newLinerFaces; } SLList<face> newCylinderHeadFaces; forAllConstIter(SLList<face>, pFaces[CYLINDERHEAD][0], iter) { const face& pf = iter(); scalar minfz = GREAT; forAll(pf, pfi) { minfz = min(minfz, points[pf[pfi]].z()); } if (minfz < zHeadMin) { pFaces[LINER][0].append(pf); } else { newCylinderHeadFaces.append(pf); } } if (pFaces[CYLINDERHEAD][0].size() != newCylinderHeadFaces.size()) { Info<< "Transfered faces from cylinder-head region to linder" << endl; pFaces[CYLINDERHEAD][0] = newCylinderHeadFaces; } } Thanks in advance. Last edited by ayhan515; October 13, 2011 at 02:54. |
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October 18, 2011, 10:03 |
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#2 | |||
Member
Ayhan Eses
Join Date: Mar 2009
Posts: 35
Rep Power: 17 |
I used checkMesh command now. The output is below.
Code:
/*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.0.1 | | \\ / A nd | Web: www.OpenFOAM.com | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ Build : 2.0.1-51f1de99a4bc Exec : checkMesh Date : Oct 18 2011 Time : 15:46:26 Host : ubuntu PID : 2780 Case : /home/ayhan/OpenFOAM/ayhan-2.0.1/run/tutorials/combustion/engineFoam/kivaTest-fluent-11-10-2011 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 = -180 Time = -180 Mesh stats points: 30742 faces: 85742 internal faces: 79522 cells: 27544 boundary patches: 3 point zones: 0 face zones: 1 cell zones: 1 Overall number of cells of each type: hexahedra: 27544 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 piston 1326 1400 ok (non-closed singly connected) liner 2710 2858 ok (non-closed singly connected) cylinderhead 2184 2260 ok (non-closed singly connected) Checking geometry... Overall domain bounding box (-0.046 -0.0459845 -0.0089896) (0.046 0.0459845 0.20335) Mesh (non-empty, non-wedge) directions (1 1 1) Mesh (non-empty) directions (1 1 1) Boundary openness (2.0111e-20 -4.34397e-19 6.81738e-20) OK. Max cell openness = 2.54332e-16 OK. Max aspect ratio = 68.0635 OK. Minumum face area = 4.94833e-07. Maximum face area = 8.23324e-05. Face area magnitudes OK. Min volume = 6.14138e-10. Max volume = 2.72275e-07. Total volume = 0.00126259. Cell volumes OK. Mesh non-orthogonality Max: 86.981 average: 37.3601 *Number of severely non-orthogonal faces: 5320. Non-orthogonality check OK. <<Writing 5320 non-orthogonal faces to set nonOrthoFaces Face pyramids OK. Max skewness = 3.89796 OK. Mesh OK. End Code:
/*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.0.1 | | \\ / A nd | Web: www.OpenFOAM.com | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ Build : 2.0.1-51f1de99a4bc Exec : engineFoam Date : Oct 18 2011 Time : 15:47:49 Host : ubuntu PID : 2985 Case : /home/ayhan/OpenFOAM/ayhan-2.0.1/run/tutorials/combustion/engineFoam/kivaTest-fluent-11-10-2011 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 engine time Create mesh for time = -180 Selecting engineMesh layered --> FOAM FATAL ERROR: cannot find cylinderHead patch From function engineMesh::engineMesh(const IOobject& io) in file engineMesh/engineMesh/engineMesh.C at line 90. FOAM exiting Quote:
Quote:
Quote:
Then now engineFoam is working. I am really shame on myself. |
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May 1, 2012, 05:29 |
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#3 |
New Member
Wang
Join Date: Sep 2010
Posts: 6
Rep Power: 16 |
Good Experience!
Thanks for your sharing. |
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August 9, 2015, 09:19 |
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#4 |
Member
Join Date: Jul 2015
Posts: 33
Rep Power: 11 |
Hi ayhan515,
thanks for your shearing. how we can figure the volume of default geometry out and then know the compression ratio and clearance volume in kivaTest ? thanks in advance. |
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August 10, 2015, 06:37 |
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#5 | |
Member
Ayhan Eses
Join Date: Mar 2009
Posts: 35
Rep Power: 17 |
Quote:
Code:
1 cd combustion/engineFoam/kivaTest 2 kivaToFoam 3 engineCompRatio Code:
/*---------------------------------------------------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.4.0 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ Build : 2.4.0-f0842aea0e77 Exec : engineCompRatio Date : Aug 10 2015 Time : 12:29:32 Host : "ayhan-virtual-machine" PID : 3716 Case : /home/ayhan/OpenFOAM/ayhan-2.4.0/run/tutorials/combustion/engineFoam/kivaTest nProcs : 1 sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE). fileModificationChecking : Monitoring run-time modified files using timeStampMaster allowSystemOperations : Allowing user-supplied system call operations // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // Create engine time Create mesh for time = -180 Selecting engineMesh layered deckHeight: 0.085639 piston position: 0 Using dynamicCode for functionObject timeStep at line 58 in "/home/ayhan/OpenFOAM/ayhan-2.4.0/run/tutorials/combustion/engineFoam/kivaTest/system/controlDict.functions.timeStep" Creating new library in "dynamicCode/setDeltaT/platforms/linux64GccDPOpt/lib/libsetDeltaT_7bdeade1ab21a2b1d5fab42a96396cc9eda6b864.so" Invoking "wmake -s libso /home/ayhan/OpenFOAM/ayhan-2.4.0/run/tutorials/combustion/engineFoam/kivaTest/dynamicCode/setDeltaT" wmakeLnInclude: linking include files to ./lnInclude Making dependency list for source file functionObjectTemplate.C Making dependency list for source file FilterFunctionObjectTemplate.C '/home/ayhan/OpenFOAM/ayhan-2.4.0/run/tutorials/combustion/engineFoam/kivaTest/dynamicCode/setDeltaT/../platforms/linux64GccDPOpt/lib/libsetDeltaT_7bdeade1ab21a2b1d5fab42a96396cc9eda6b864.so' is up to date. CA = 0 deltaZ = 0.08423 clearance: 0.001409 Piston speed = 4.2115 m/s Vmax = 0.000631297, Vmin = 7.15569e-05 Vmax/Vmin = 8.82231 End |
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August 10, 2015, 09:45 |
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#6 |
Member
Join Date: Jul 2015
Posts: 33
Rep Power: 11 |
hi ayhan515,
I appreciate u. yes ,I did ,but unfortunately I don't have any idea. I have some question . would you mind helping me? 1) I want to run the bore*stroke=76*66 in different compression ratio e.g.,12 and 20. How can i create this C.R ? 2) When i run bore*stroke = 86*86 for KivaTest ,it runs until -5 not 60 . what's the reason? thanks in advance. |
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