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#1 |
Senior Member
Pedro Oliveira
Join Date: Feb 2018
Location: Portugal
Posts: 109
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Hello to you all again
![]() In my system I have a water cooling system with 0,2 l/s where the water receives the heat from the solids around, which gets to "turbulent" velocities. (Reynolds number). And a container with heated water which evaporates and gets really fast and hot. IŽm tryind to decide wich turbulence models should I use for each situatuion and I canŽt get any conclusion. Do you have any hint which one fits better each situation in particular? Best regards and thanks!! |
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#2 |
Senior Member
urosgrivc
Join Date: Dec 2015
Location: Slovenija
Posts: 365
Rep Power: 12 ![]() |
personaly I would use SST model for the firs case, beacouse you have heat transfer so you need acurate near wall modeling and because it combines omega and epsilon models with 2 blending functions. You can also complicate and add additional 2 equations for (transitional turbulence) intermitency and rethetat, so the flow can be laminar and turbulent (laminar usualy in the proximity of the wals)
For the second case I am not sure as i dont have experience with evaporation in cfx |
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#3 |
Senior Member
Stuart
Join Date: Jul 2009
Location: Portsmouth, England
Posts: 744
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Shear Stress Transport (SST) with the default automatic wall treatment is a good place to start for RANS/URANS simulations. Only once you see the results can you judge if another model should be used instead or if you need to go with a RSM or scale-resolving method.
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#4 |
Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,938
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SST is my working horse in these cases.
Make sure Y+ is around 1 where Prandtl is high (approx 7 at cooling side?). |
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#5 |
Senior Member
Pedro Oliveira
Join Date: Feb 2018
Location: Portugal
Posts: 109
Rep Power: 8 ![]() |
I will use SST and see if I got convergence problems and if it doesnŽt corresponds to the experimetnal values IŽl try another.
Thank you very much guys!!!! Good work to you all |
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