Turbulence and viscosity of nonNewtonian Fluids
Hello, I use fluent and need to simulate polymer viscosity vs shear rate and the turbulence. I've try with some turbulent models but they want constant viscosity to calculate the turbulence.
Is it possible to copy the non newtonian model in a UDF and then use a turbulent model. I've never try to use UDF until now. Thank you for advice David 
Re: Turbulence and viscosity of nonNewtonian Flui
To use turbulence with nonnewtonian fluid, you need to activate the turbulence model through the command line not through the GUI.
So to resume, you doesns't need to use UDF for your problem. 
Re: Turbulence and viscosity of nonNewtonian Flui
I wrote
define/models/viscous/turbulenceexpert/turbnonnewtonian? but the command is not valide. I received this message "invalid command". Thanks 
Re: Turbulence and viscosity of nonNewtonian Flui
What version of Fluent do you have? in 6.0.12 the command is not available.

Re: Turbulence and viscosity of nonNewtonian Flui
The version is Fluent 6.2.16.
Is it possible to check if I have all the libraries to use the turbulence with the viscosity of non newtonian fluids. 
Re: Turbulence and viscosity of nonNewtonian Flui
Hi David, First select the standard ke model, then use TUI and write define\model\viscous\turbulent expert\ Then you can select
turbnonnewtonian? Enable turbulence for NonNewtonian fluids. nonnewtonianmodification? Enable NonNewtonian modification for LamBremhorst model. Hope that can help  Wael 
Re: Turbulence and viscosity of nonNewtonian Flui
Thank you a lot.
I use it with non newtonian power law. 
Re: Turbulence and viscosity of nonNewtonian Flui
I wanted to define viscosity by this function:
v=v0*exp(b(TT0))*g^n where : v=viscosity b=constant T=temperatur g=shear rate thanks for you kind help 
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