Hello
I am solving sub-cooled boiling flow with CFX. I do not want to use single phase wall function. I want to solve the viscous sub-layer. Is it possible? If so which turbulence model is suitable? Which points should I take into account?
Thank you
yes you can solve it. there are 4 or 5 models by using them you can solve the problem. these models are- k epsilon model, k omega model, LES, RANS, DNS.
there is no such criteria for choosing these models. you have to go through the literature for best choosing the model which is best suited for solving your problem.
Prashant Saini : That k-epsilon is a suitable model to resolve the viscous sublayer is simply wrong, at least for ANSYS CFX. In k-epsilon model the so-called scalable wall functions are used at any time, and with no regard to the near-wall mesh resolution. If someone would like to resolve the viscous sublayer, than SST model with automatic wall functions or pure LES with correspondingly very high grid resolution are the best choices.
Sibel Tas : I think we had discussed this already once in the past on a meeting. In my honest opinion it is not possible, if the RPI wall boiling model is applied (and another wall boiling model is currently not existing in the code). The reason is the following:
For resolving the viscous sub-layer, e.g. with SST model and automatic wall functions, you need to apply a very fine mesh near the wall with y+
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