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Vertical Axis Turbine Simulation

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Old   July 24, 2013, 06:51
Default Vertical Axis Turbine Simulation
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dalecooper
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Hello,

I have been doing some simulations with vertical axis turbines in Fluent. In order to achieve good results I have tried using the Inflation option in Ansys Meshing module around the different airfoils in the turbine. But I found a problem in Fluent that says: 'Divergence detected in AMG solver'. When I disable the Inflation option the problem disappears.

I have tried different meshing methods as quadrilaterals and triangles as well as refining the mesh using sphere of influence around every airfoil, but still I haven't found a proper solution to the divergence error.

Thanks in advance and best regards.
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Old   July 24, 2013, 07:42
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Paritosh Vasava
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Are you working with dynamic mesh or moving frame of reference?
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Old   July 24, 2013, 07:57
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Quote:
Originally Posted by vasava View Post
Are you working with dynamic mesh or moving frame of reference?

I'm working with sliding mesh techique. I have defined two interfaces to separate the rotating airfoils zone and the non moving mesh zones of my domain.

I have obtained some good results with the quad mesh, but when I use the triangle mesh the results are completely different and the computational time increases too much.
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Old   July 24, 2013, 08:53
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The divergence message is because the pressure distribution is not correctly predicted.

You can check the pressure distribution and check if there is abnormal pressure distribution in some region. You can improve or refine mesh in that region.

If the pressure distribution is ok then you can lower the under relaxation factor for few iterations until the pressure is back to normal.
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