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Issues with creating "regions" for conjugate heat transfer problem!! |
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April 22, 2015, 12:25 |
Issues with creating "regions" for conjugate heat transfer problem!!
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#1 |
Member
VA
Join Date: Mar 2015
Location: ON, Canada
Posts: 30
Rep Power: 11 |
Dear OpenFOAMers,
I am relatively new to the world of OpenFOAM. I am currently working on a problem that involves conjugate heat transfer. I have attached two PDFs that show snapshots of the geometry I am dealing with. I have ONE fluid region and FOUR solid regions surrounding it. The material properties of the solid regions are same except that a heat source is applied to two of these regions. The momentum equations are solved in the fluid region, while the energy equation is solved in both the fluid and solid regions. I created the regions using blockMesh. I have the following issues: 1. In the case of original_geo.pdf, the problem seems to be with the creation of defaultFaces at the interface of the fluid-solid regions i.e. Region 1- Region 3 , Region1-Region 2 and so on. This happens as the regions on either side cannot "see" the face b/w the regions and hence default patches are created. This is not ideal as I need the temperature at the interface to be coupled. 2. As a workaround, I split the fluid region into two regions as shown in "Modified_geo".pdf. However, in this case the velocity is not continuous b/w the two fluid regions. The temperature coupling works fine in this case, though. I am not sure how to work around this issue. Any help/suggestion would be greatly appreciated. Thanks!! |
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April 22, 2015, 19:58 |
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#2 | |
Member
Jace
Join Date: Oct 2012
Posts: 77
Rep Power: 16 |
Quote:
in your blockMesh, create it as if there's 6 regions (basically what you did in the modified geometry), but then inside topoSet, make sure you combine the 2 fluid regions into one. This way, your fluid region will have 4 patches (one shared with each solid region). and patches will be defined properly between regions. Have you tried that? |
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April 23, 2015, 08:54 |
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#3 |
Member
Thiago Parente Lima
Join Date: Sep 2011
Location: Diamantina, Brazil.
Posts: 65
Rep Power: 15 |
Hi vabishek,
I think this tutorial will help you in creating your regions. It is the best tutorial on chtMultiRegion I've found. Tutorial to set up a case for chtMultiRegionFoam in OpenFOAM 2.0.0 Regards,
__________________
Fields of interest: buoyantFoam, chtMultRegionFoam. |
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April 23, 2015, 10:07 |
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#4 | |
Member
VA
Join Date: Mar 2015
Location: ON, Canada
Posts: 30
Rep Power: 11 |
Quote:
Thanks for replying. Yes, I did try that but I was unsuccessful. It probably has to do with how I defined the regions in both blockMesh and toposetDict files. I have attached the files. I have a feeling that the way I define the regions in blockMesh is preventing me from creating the regions using topoSet. I have also attached a log file that contains the error I get when running splitMeshRegions after running blockMesh and topoSet. |
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April 23, 2015, 10:10 |
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#5 | |
Member
VA
Join Date: Mar 2015
Location: ON, Canada
Posts: 30
Rep Power: 11 |
Quote:
Thanks for the link. I also think it is one of the best out of there. It was the first tutorials I went through when I started learning about CHT. I pretty much tried to follow it, but haven't had any luck. |
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April 23, 2015, 17:11 |
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#6 | |
Member
Jace
Join Date: Oct 2012
Posts: 77
Rep Power: 16 |
Quote:
blockMeshDict Code:
/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.2.0 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; object blockMeshDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // convertToMeters 1; vertices ( (-0.00259 0.0578 0.000279) //0 (-0.00114 0.0578 0.000279) //1 (-0.00114 0.069 0.000279) //2 (-0.0031 0.069 0.000279) //3 (0.00114 0.0578 0.000279) //4 (0.00114 0.069 0.000279) //5 (0.00259 0.0578 0.000279) //6 (0.0031 0.069 0.000279) //7 (0.00114 0.0578 0.000803) //8 (0.00259 0.0578 0.000803) //9 (0.0031 0.069 0.000803) //10 (0.00114 0.069 0.000803) //11 (-0.00259 0.0578 0.000803) //12 (-0.00114 0.0578 0.000803) //13 (-0.00114 0.069 0.000803) //14 (-0.0031 0.069 0.000803) //15 (-0.00114 0.0578 0.000889) //16 (0.00114 0.0578 0.000889) //17 (0.00114 0.069 0.000889) //18 (-0.00114 0.069 0.000889) //19 (-0.00259 0.0578 0.000889) //20 (-0.0031 0.069 0.000889) //21 (0.00259 0.0578 0.000889) //22 (0.0031 0.069 0.000889) //23 ); blocks ( hex (13 8 11 14 16 17 18 19) (30 30 30) simpleGrading (1 1 1) hex (1 4 5 2 13 8 11 14) (30 30 30) simpleGrading (1 1 1) hex (12 13 14 15 20 16 19 21) (30 30 30) simpleGrading (1 1 1) hex (8 9 10 11 17 22 23 18) (30 30 30) simpleGrading (1 1 1) hex (0 1 2 3 12 13 14 15) (30 30 30) simpleGrading (1 1 1) hex (4 6 7 5 8 9 10 11) (30 30 30) simpleGrading (1 1 1) ); edges ( ); boundary ( leftWall { type patch; faces ( (0 12 15 3) (12 20 21 15) ); } rightWall { type patch; faces ( (6 9 10 7) (9 22 23 10) ); } topWall { type patch; faces ( //top (20 16 19 21) (16 17 18 19) (17 22 23 18) ); } bottomWall { type patch; faces ( (0 1 2 3) (1 4 5 2) (4 6 7 5) ); } Inlet { type patch; faces ( (0 1 13 12) (12 13 16 20) (1 4 8 13) (13 8 17 16) (4 6 9 8) (8 9 22 17) ); } Outlet { type patch; faces ( (15 14 2 3) (21 19 14 15) (14 11 5 2) (19 18 11 14) (11 10 7 5) (18 23 10 11) ); } ); mergeMatchPairs(); mergePatchPairs(); // ************************************************************************* // Code:
/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.2.0 | | \\ / A nd | Web: www.OpenFOAM.org | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class dictionary; object topoSetDict; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // actions ( // Heater { name block1; type cellSet; action new; source boxToCell; sourceInfo { box (-0.00114 0.0578 0.000803 )(0.00114 0.069 0.000889); } } { name block1; type cellSet; action add; source boxToCell; sourceInfo { box (-0.00114 0.0578 0.000279)(0.00114 0.069 0.000803); } } { name block1; type cellZoneSet; action new; source setToCellZone; sourceInfo { set block1; // name of cellSet } } // leftSolid { name block2; type cellSet; action new; source boxToCell; sourceInfo { box (-0.0031 0.0578 0.000803 )(-0.00114 0.069 0.000889); } } { name block2; type cellZoneSet; action new; source setToCellZone; sourceInfo { set block2; } } // rightSolid { name block3; type cellSet; action new; source boxToCell; sourceInfo { box (0.00114 0.0578 0.000803 )(0.0031 0.069 0.000889); } } { name block3; type cellZoneSet; action new; source setToCellZone; sourceInfo { set block3; } } // topAir { name block4; type cellSet; action new; source boxToCell; sourceInfo { box (-0.0031 0.0578 0.000279 )(-0.00114 0.069 0.000803); } } { name block4; type cellZoneSet; action new; source setToCellZone; sourceInfo { set block4; } } // bottomWater is all the other cells { name block5; type cellZoneSet; action clear; } { name block5; type cellSet; action add; source cellToCell; sourceInfo { set block1; } } { name block5; type cellSet; action add; source cellToCell; sourceInfo { set block2; } } { name block5; type cellSet; action add; source cellToCell; sourceInfo { set block3; } } { name block5; type cellSet; action add; source cellToCell; sourceInfo { set block4; } } { name block5; type cellSet; action invert; } { name block5; type cellZoneSet; action new; source setToCellZone; sourceInfo { set block5; } } ); // ************************************************************************* // blockMesh topoSet splitMeshRegions -cellZones -overwrite paraFoam -touchAll and view with paraview. Good luck. |
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April 23, 2015, 17:23 |
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#7 | |
Member
VA
Join Date: Mar 2015
Location: ON, Canada
Posts: 30
Rep Power: 11 |
Quote:
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