wallHeatTransferCoeff in chtMultiRefionFoam OF6 not working
Hello Everyone,
In chtMultiRegionFoam, I want to calculate heat transfer coefficient. OpenFOAM has introduced "wallHeatTransferCoeff" function object in OF6 to calculate heat transfer coefficient directly. Here is the link I am trying to test this function. Hence, I have only included following function in controlDict to calculate the wall heat transfer coefficient. Quote:
But I am getting following error Quote:
It seems like wallHeatTransferCoeff has not been for chtMultiRegionFoam, but realease note of OF6 specially mentions that it could be used to calculate heat transfer coefficient in multiregio simulation. Did anyone try this function? Am I missing something or making a mistake? I took OF6 multiRegionHeater tutorial, I didn't change anything in tutorial at all Thank you Regards 
This was made for incompressible solvers. Hence your error message. While chtMultiRegion can calculate incompressible flow it is still a compressible solver (which allows the user to set a constant density). If you follow the link you gave to the commit you can read
Code:
wallHeatTransferCoeff: New functionObject to calculate the wall heat … This function object calculates this in the following fashion: Code:
wallHeatTransferCoeffBf[patchi] = 
Hi Bloerb,
Thank you for your reply. Quote:
You are absolutely right, it is mentioned over there that it is for incompressible flow but I couldn't find that it is only for flow using using simple. pimple or pisoFoam. What I could find is: Quote:
It is meant for multiRegion (off course incompressible) and as per my understanding from this link, there is only one solver for multiregion in OF6 i.e. chtMulriRegionFoam (they have combined both chtMulriRegionSimpleFoam and chtMulriRegionFoam in one solver i.e chtMulriRegionFoam) and chtMulriRegionFoam is by default for compressible fluid. Quote:
Then how could we use wallHeatTransferCoeff for multiregion? Regards 
As I said, you can't use it with this solver without programming your own utility

Quote:
Could someone explain the formula used for heat transfer coefficient mentioned above? I want to use it for an incompressioble simulation with water trough pipes . Water is at 100C and the solver used is simpleFoam. I want to visualize the "virtual" heat transfer coefficient at walls . I think that I have set correctly the function object in the controlDict : Code:
wallHeatTransferCoeff1 what I have missed? thanks 
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