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-   -   Now newtonian convergence (http://www.cfd-online.com/Forums/cfx/23690-now-newtonian-convergence.html)

Gustavo February 28, 2007 10:08

Now newtonian convergence
 
Hi, Im simulating a steady flow in a tube. As its a 'well-behaved' flow, i used extruded 2d simulation. For the newtonian fluid I got great results. But for the non-newtonian fluid it either doesnt converge or the results arent physically correct. How can can I get a good result? I've tried chganging the mesh, altering the inlet velocity, using other turbulence models and nothing worked. Thanks

opaque February 28, 2007 10:22

Re: Now newtonian convergence
 
Dear Gustavo,

What "non-newtonian model" are you using?

Opaque


Gustavo February 28, 2007 11:26

Re: Now newtonian convergence
 
Visc=k*y^(n-1), and I also bound the equation with a min and a max, just like in the tutorial.

opaque February 28, 2007 11:40

Re: Now newtonian convergence
 
Dear Gustavo,

I assume that "y" mean shear strain rate, and not "y coordinate".. Correct?

Opaque..


Gustavo February 28, 2007 19:27

Re: Now newtonian convergence
 
Yes...


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