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chtMultiRegionFoam connection between solid and fluid region of heat exchanger

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Old   March 2, 2015, 12:19
Default chtMultiRegionFoam connection between solid and fluid region of heat exchanger
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Hello there!

I hope that someone can help me with something I've been working on for quite a time already.

I'm trying to set up a chtMultiRegionFoam case of a flat plate finned tube heat exchanger with OF 2.3.

As the geometry is a little complicated, I'm starting off to work with a very simple geometry.

What I've done till now is:
1) I created a mesh using the ANSYS Meshing tool. It looks as follows:
https://rwth-aachen.sciebo.de/public...93d55b1e74bb48
It is very much simplified. To the left (coloured brown) there is the plate aka solid region, to the right (coloured blue) there is the fluid region, which represents the air streaming through the heat exchanger.

2) I used the fluent3DMeshToFoam command to implement the mesh into an existing chtMultiRegionFoam case. What I got was a new folder constant/polyMesh in which there are several files (boundary, cellZones etc.). I already had two different cell zones then (solid and fluid).

3) Then I changed the boundaries to symmetry, wall etc.

4) Then I used the command splitMeshRegions -cellZonesOnly -useFaceZones ,which created two new sub-files fluid and solid in the time file. These files each include their own file polyMesh (eg /0.002/fluid/polyMesh/boundary)

5) Then I changed the two patches, which are the contact patches between the solid and the fluid region to the type "mappedWall" in the said files

Quote:
fluid_solid-kontaktbereich-trg
{
type mappedWall;
inGroups 1(wall);
nFaces 3365;
startFace 89746;
sampleMode nearestPatchFace;
sampleRegion solid;
samplePatch solid_fluid-kontaktbereich-src;
}
)
6) Then I changed the boundary conditions in the time files as well and tried to run the whole case with chtMultiRegionFoam

The simulation seems to work, but my problem is that the two regions dare still not. When I set the initial temperatures to 230 K for the fluid region and 270 K for the solid region, there is no change of temperature over time at all in the fluid region. Thus, heat is not transferred between the two regions.

What did I do wrong? Thank you


FYI:
- I use changeDictionaryDict to define the properties of the regions.
- The"exchange" of temperature is defined through compressible::turbulentTemperatureCoupledBaffleMix ed
- checkMesh claims that there are "Two regions, which are not connected by any face" https://rwth-aachen.sciebo.de/public...82401e0b442de6
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Old   December 18, 2019, 00:37
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Vishsel
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Hi all,

How to create patches ''type mappedWall'' between solid and fluid body.. which command to use for creating the patches between solid and fluid body ?

splitMeshRegions -cellZones -overwrite & splitMeshRegions -cellZonesOnly -useFcaeZones --> by using these commands, i am getting only interface between fluid to fluid body or solid to solid body. But not solid to fluid body. And also the mesh was conformal.

Can I know what problem is this??

Thank you in advance..

Last edited by Vishsel; December 18, 2019 at 05:51.
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