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Polyhedra and sliding mesh?

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Old   March 27, 2009, 18:30
Default Polyhedra and sliding mesh?
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Ewan
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I am doing some simulation in mixing tank using FLUENT. Because the impeller is a close clearance impeller, it has very small gap between the impeller and the tank wall. The impeller blades are quite thin too. All these create a lot of trouble for grid generation. Usually, there would be a couple of grids have a skewness of higher than 0.9 (less than 0.95, though), and a dozen of grids higher than 0.85. Using smaller mesh size doesn't really help reducing the skewness. If I run sliding mesh method on this mesh, usually there would be some convergence problem sooner or later, probably due to the left-handed faces created during the movement of the rotating zone. I tried converting the whole domain to polyhedra mesh. It would run fine and much faster because of much less grids. However, I found that the velocity profile is not physically reasonable on the interface between the rotating zone and the stationary zone. So I was wandering whether I could use polyhedra with sliding mesh, is there any compatability problem? It is also welcome if anyone know how to reduce the skewness effectively without using too much grids. I am already getting about 2 million grids at the moment.

P.S.: I checked the FLUENT user's guide on the polyhedra limitations. It does not say anything on sliding mesh or MRF. FLUENT model compatibility chart didn't say anything about polyhedra mesh either.
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Old   March 28, 2009, 19:10
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Currently, polyhedral mesh cannot be used in any moving or sliding mesh model
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Old   March 29, 2009, 11:31
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I agree with panda, Fluent user guide is clear at this point: for now, no capability for sliding mesh with polyhedra mesh ...

Greetings,

Freeman
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Old   July 3, 2009, 04:36
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Could either of you point me to where in the user guide it says that the polyhedral approach can't be used with sliding meshes? I can only find reference to deforming/dynamic meshes, not sliding meshes.
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Old   February 21, 2012, 07:00
Default sliding mesh , plz help
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hello
i am not able to apply sliding mesh in train moving in tunnel. can any body help me.
my email sheikhnasir39@gmail.com
thanks
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