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wallHeatTransferCoeff in chtMultiRefionFoam OF6 not working |
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September 18, 2018, 11:09 |
wallHeatTransferCoeff in chtMultiRefionFoam OF6 not working
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#1 | ||
Senior Member
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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 multi-regio 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 |
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September 19, 2018, 03:50 |
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#2 |
Senior Member
Join Date: Sep 2013
Posts: 353
Rep Power: 21 |
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 … …transfer coefficient for incompressible flow simulated using simpleFoam, pimpleFoam or pisoFoam. This function object calculates this in the following fashion: Code:
wallHeatTransferCoeffBf[patchi] = rho_*Cp_*(nuBf[patchi]/Prl_ + nutBf[patchi]/Prt_); |
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September 19, 2018, 06:21 |
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#3 | |||
Senior Member
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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 OF-6 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 multi-region? Regards |
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September 19, 2018, 09:54 |
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#4 |
Senior Member
Join Date: Sep 2013
Posts: 353
Rep Power: 21 |
As I said, you can't use it with this solver without programming your own utility
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September 17, 2020, 13:17 |
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#5 | |
Member
giovanni
Join Date: Sep 2017
Posts: 50
Rep Power: 9 |
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 { type wallHeatTransferCoeff; libs ("libfieldFunctionObjects.so"); //region fluid; //patches (".*Wall"); rho 997; Cp 4215.7; Prl 1.64; Prt 0.9; } what I have missed? thanks |
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