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-   -   Non-physical flow: omega is fixed at inlet (http://www.cfd-online.com/Forums/openfoam-solving/109355-non-physical-flow-omega-fixed-inlet.html)

aljazari November 15, 2012 12:18

Non-physical flow: omega is fixed at inlet
 
Hi

This is driving me crazy!

I'm simulating a flow past a transonic aerofoil (RAE 2822), I wrote a small script to generate a blockMeshDict which would then generate a C-Mesh around the aerofoil. Everything except omega at the inlet is fine.

Here's my part of my entry for omega:
Code:

internalField  uniform 242315;

boundaryField
{

    INLET
    {
        type            fixedValue;
        value          $internalField;
    }

This is supposed to be an initial value, the thing is; omega stays as it is told: fixed at the inlet. Here's screenshot:

http://oi45.tinypic.com/34e3k11.jpg

Something even more strange: I have a c-mesh for this same aerofoil converted from Fluent (originally from Numeca), and when I run the simulation using this mesh with the exact same conditions, omega is changing at the inlet, i.e. it is being solved!. Here's a screenshot:

http://oi45.tinypic.com/24wf1jc.jpg

This seems more 'physical'.

Am I correct to say the 1st screenshot doesn't look correct at all. If yes, what is wrong with the mesh/boundaries. Can someone help me?

I have also uploaded the two cases, the first one is using the mesh I generated, (blockMeshDict) is included as well. The second is using the converted Fluent mesh.

*I originally had the two meshes to have the same boundaries but then I decided to create a 'topAndBottom' boundary patch as well in the hope that it will change the behaviour of omega at the inlet.

Case1(block Mesh): http://www.mediafire.com/?bfemuyx2qofh4qh
Case2(fluent mesh): http://www.mediafire.com/?zvz2n15izzb0i1m


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