Physical Model

isaac_h · November 14, 2023, 03:10

Hi!

I'm doing a conjugate heat transfer analysis och my fluid temperature will vary, so for different cases my Reynolds number will vary from around 1000 to 6000 (pipeflow). What model would you use? I have now used the k-omega SST, but since in some cases the flow will be more laminar, I am not sure if this is the right approach.

As I understand it, it is not a good idea to switch model in between cases, for example if i would use the laminar model for R<2300 and the k-omega for everything above. My pipe has a smooth bend , but my region of interest is after the entry length after this bend. I have also added roughness inside my pipe to get the right pressure drop for the k-omega model.

Any insight on how to think here?

isaac_h · November 14, 2023, 03:13

Also, I have looked into the transition sst model, but it is more suiteble for aerodynamics and not so much for pipeflow if i understand it correctly?

November 14, 2023, 03:10	Physical Model	#1
isaac_h New Member Join Date: Oct 2023 Posts: 10 Rep Power: 2	Hi! I'm doing a conjugate heat transfer analysis och my fluid temperature will vary, so for different cases my Reynolds number will vary from around 1000 to 6000 (pipeflow). What model would you use? I have now used the k-omega SST, but since in some cases the flow will be more laminar, I am not sure if this is the right approach. As I understand it, it is not a good idea to switch model in between cases, for example if i would use the laminar model for R<2300 and the k-omega for everything above. My pipe has a smooth bend , but my region of interest is after the entry length after this bend. I have also added roughness inside my pipe to get the right pressure drop for the k-omega model. Any insight on how to think here?

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November 14, 2023, 03:13		#2
isaac_h New Member Join Date: Oct 2023 Posts: 10 Rep Power: 2	Also, I have looked into the transition sst model, but it is more suiteble for aerodynamics and not so much for pipeflow if i understand it correctly?