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[GAMBIT] Moving Mesh on a Savonius VAWT

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Old   August 13, 2010, 04:23
Default Moving Mesh on a Savonius VAWT
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Hi guys,
i have a question about the geometry of a 2d savonius with moving mesh.
I am developing a chart of the various coefficients (cd,cl,cm) for different incidence angles with a
velocity of 20 m/s (inlet).
I have already made the static study with a mesh of about 2 millions cells : my vawt is large about 2,4m
and my domain is 20mx20m.
Now to make the moving mesh,what have i to do?I know i have to make a smaller domain near the profile (about 2,5x2,5m)
with gambit,but i am not sure.
Once i have made the inner domain and splitted the faces how i proceed?I have read the tutorial about the moving mesh for
fluent but i have not well understood how proceed.
Thanks guys,regards,
Richard
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Old   August 16, 2010, 02:39
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Maxime Perelli
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The question is: do you want to use Moving Mesh or Sliding Mesh?
With Sliding Mesh you can define interface between rotor and stator. It will be easier than Moving Mesh
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Old   August 16, 2010, 04:00
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Max you always come in my help (i have not forgotten your help in my mesh making of the 2d Savonius),so thanks again.
Yes, i am going to use the sliding mesh using interfaces.
Reading around i have planned to make 2 different geometries (and then use t-grid to create the final mesh) :
1)A large disc with a hole inside with the outer edge of the inner circle setted as interface and the outer edge of the large disc setted as velocity inlet.I meshed it with a quad map.
2)A disc of the same size of the inner circle with the "s" profile of my savonius inside and i'd like to mesh it with a simple tri-pave but i have the problem (suggested by you in the other post) of the different mesh size.You suggest me to use the size function,but since i have never used it,have you some suggestions?Thanks as ever,regards
Richard
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Old   August 16, 2010, 05:14
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Ok then it is not moving mesh (no layering - smoothing or remeshing).
Pay attention that mesh on interfaces should be on the same order regarding cell size
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