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Couette flow with nonNewtonianicoFoam

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Old   September 25, 2008, 09:58
Default Hello, I want to model a Co
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florian
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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
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Old   September 29, 2008, 03:38
Default According to these equations I
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florian
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According to these equations I should have a linear profit

couette laminaire

Can someone help me ?
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Old   December 7, 2010, 05:39
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Hi,
how did you do the Geometry?
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