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chtMultiRegionSimpleFoam for forced convection.

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Old   August 29, 2021, 04:21
Default chtMultiRegionSimpleFoam for forced convection.
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Mandeep Shetty
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Hello,
I have read that chtMultiRegionSimpleFoam is a blend of buoyantsimplefoam and laplacefoam. I don't see any problem...but still wanted to confirm this can be used for forced convection as well as natural convection problem? Also, is there a blend of rhosimplefoam and laplacefoam?
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Old   August 29, 2021, 06:02
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Uwe Pilz
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I experimented with buoyantsimplefoam a while ago. Results for free convection are great and agreed with theoretical results.
I was never happy with combination of forced and free convection. Mosty, at some edge a region of unnatural high velocity occurred which captured all of the region until the case exploded.

My be, another combination of schemes and solvers, together with relaxation may cure this. All in all I felt it is not a stable case for this solver.
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Old   August 29, 2021, 09:30
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Quote:
Originally Posted by piu58 View Post
I experimented with buoyantsimplefoam a while ago. Results for free convection are great and agreed with theoretical results.
I was never happy with combination of forced and free convection. Mosty, at some edge a region of unnatural high velocity occurred which captured all of the region until the case exploded.

My be, another combination of schemes and solvers, together with relaxation may cure this. All in all I felt it is not a stable case for this solver.
Thank you. Which CHT solver do you think is good for forced convection?
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Old   August 29, 2021, 15:53
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The most used and most time-tested solver is pimpleFoam. But you cannot take free convection into account with that.
I solution could be that you run two simulations and decide which type of convection influences the boundary layer most. There are some regions, of course, where both appear. You have to think about a method of blending them.
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Old   August 29, 2021, 23:29
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Quote:
Originally Posted by piu58 View Post
The most used and most time-tested solver is pimpleFoam. But you cannot take free convection into account with that.
I solution could be that you run two simulations and decide which type of convection influences the boundary layer most. There are some regions, of course, where both appear. You have to think about a method of blending them.
I want to run multiregion case so are you suggesting chtMultiregionFoam but switching from PISO to pimple?
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