CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM Running, Solving & CFD (http://www.cfd-online.com/Forums/openfoam-solving/)
-   -   Couette flow with nonNewtonianicoFoam (http://www.cfd-online.com/Forums/openfoam-solving/58517-couette-flow-nonnewtonianicofoam.html)

floooo September 25, 2008 09:58

Hello, I want to model a Co
 
Hello,

I want to model a Couette flow.
With a newtonian flow all work fine, the velocity profile fell linear.
But when I use a nonNewtonian Flow the solution converge towards a bad result.

My 2D model is a rectangle 80mmx8mm

- The top wall velocity is 0
The bottom wall velocity is 0,21 m/s

dimensions [0 1 -1 0 0 0 0];

internalField uniform (0 0 0);

boundaryField
{
frontAndBackPlanes
{
type empty;
}

outlet
{
type zeroGradient;
}

inlet
{
type zeroGradient;
}
top
{
type fixedValue;
value uniform (0 0 0);
}
bottom
{
type fixedValue;
value uniform (0.21 0 0);
}
}

- inlet pressure 1Pa/rho

dimensions [0 2 -2 0 0 0 0];

internalField uniform 1;

boundaryField
{
frontAndBackPlanes
{
type empty;
}
outlet
{
type fixedValue;
value uniform 1;
}

inlet
{
type zeroGradient;
}
top
{
type zeroGradient;
}
bottom
{
type zeroGradient;
}
}


nuo=250 m2/s
gamma0=1 s-1
n=0.4

I plot the result :
http://www.imagup.com/imgs/1222358528.html

Why my pressure profile is not constant.

Thanks,
Florian

floooo September 29, 2008 03:38

According to these equations I
 
According to these equations I should have a linear profit

couette laminaire

Can someone help me ?

T.D. December 7, 2010 06:39

Hi,
how did you do the Geometry?


All times are GMT -4. The time now is 09:01.