Density correction function for turbulent viscosity

Bando · January 20, 2015, 04:20

Hello there!

I am simulating cavitating flow in nozzles and i would like to modify the calculationg of the turbulent viscosity.

with the normal formula mu_turb = C_mu*k*k/eps the turbulent viscosity will be overpredicted in the 2-phase region and thus completely change the dynamic behaviour of the cavitation cloud.

One common way of reducing the turbulent viscosity in the 2-phase region is to introduce a function within the formula of the turbulent viscosity:

mu_turb = f(rho)*C_mu*k*k/eps

where $f(roh)=rho_v+(\frac{rho_v-rho}{rho_v-rho_l})^{10}*(rho_l-rho_v)$

with l and v denoting liquid and vapour.

so at the moment i don't really know where and how i can modify the equation. I would be really thankfull for any kind of suggestions.

zlw306 · July 9, 2017, 03:44

Im face the same problem. It seems can be modified in fluent.i also want to know whether it can be realised in starccm+.

Sent from my iPhone using CFD Online Forum mobile app

January 20, 2015, 04:20	Density correction function for turbulent viscosity	#1
Bando New Member Join Date: Jun 2012 Posts: 6 Rep Power: 14	Hello there! I am simulating cavitating flow in nozzles and i would like to modify the calculationg of the turbulent viscosity. with the normal formula mu_turb = C_mukk/eps the turbulent viscosity will be overpredicted in the 2-phase region and thus completely change the dynamic behaviour of the cavitation cloud. One common way of reducing the turbulent viscosity in the 2-phase region is to introduce a function within the formula of the turbulent viscosity: mu_turb = f(rho)C_mukk/eps where $f(roh)=rho_v+(\frac{rho_v-rho}{rho_v-rho_l})^{10}(rho_l-rho_v)$ with l and v denoting liquid and vapour. so at the moment i don't really know where and how i can modify the equation. I would be really thankfull for any kind of suggestions.

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July 9, 2017, 03:44		#2
zlw306 New Member Liwei Zhang Join Date: Jun 2017 Posts: 10 Rep Power: 9	Im face the same problem. It seems can be modified in fluent.i also want to know whether it can be realised in starccm+. Sent from my iPhone using CFD Online Forum mobile app