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-   -   Problem with solving for incompressible flow (http://www.cfd-online.com/Forums/openfoam-solving/59924-problem-solving-incompressible-flow.html)

susana November 23, 2006 07:12

Hi All, I am a new user of
 
Hi All,
I am a new user of OpenFOAM amd have a problem and will really appreciate any help.

I modified the simpleFoam (incompressible, steady-state) tutorial to include a momentum sink (function of velocity) and tried to solve for velocity U and pressure p . I am solving for a fixed velocity inlet and zero gradient outflow on slip walls. I am getting the right pressure drop but there is a fluctuation in the velocity values at the inlet and outlet in the answer and I dont understand why. I am attaching the output from paraview. http://www.cfd-online.com/OpenFOAM_D...your_image.gif

Thanks in advance,
Susan.

susana November 24, 2006 04:01

Hi All, I am a new user of Op
 
Hi All,
I am a new user of OpenFOAM amd have a problem and will really appreciate any help.

I modified the simpleFoam (incompressible, steady-state) tutorial to include a momentum sink (function of velocity) and tried to solve for velocity U and pressure p . I am solving for a fixed velocity inlet and zero gradient outflow on slip walls. I am getting the right pressure drop but there is a fluctuation in the velocity values at the inlet and outlet in the answer and I dont understand why. I am attaching the output from paraview. http://www.cfd-online.com/OpenFOAM_D...your_image.gif

Thanks in advance,
Susan.

susana November 24, 2006 04:07

Sorry, I tried to upload the i
 
Sorry, I tried to upload the image file twice but it does not even prompt me on netscape (7.0) . Am I doing something wrong?

dmoroian November 24, 2006 04:32

You can not do that for the mo
 
You can not do that for the moment. See no picture

Dragos

olwi November 24, 2006 21:17

Did you include the momentum s
 
Did you include the momentum sink/source also in the equation for pressure correction? I think you should... If you derive the equation for pressure, you'll see your source/sink there, too.

/Ola


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