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help with setting up overset mesh

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Old   May 14, 2017, 09:12
Default help with setting up overset mesh
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Calvin Wong
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Hi,

I am quite new to CFD and Fluent (had minimal experience with CFX previously) so please forgive me for the simple questions. Currently I am trying to model propeller flow in a box in 3D and I was advised that overset mesh is a good option. However, I cant find a lot of resources on overset mesh setup. This video is pretty much the only thing I can find, and the Fluent user guide is just not enough to help me with understanding the setup. So, I have divided my simulation in 2 stages and have the following questions:

Stage 1: just rotating a propeller in a fluid domain (air), no enclosure
1. I have 2 meshes, a cylinder of air as background mesh, and the propeller as the component mesh. In "cell zone conditions", I should define the air as type "fluid" and the propeller as type "solid" right? But overset doesnt support solid cell zone!! what have I done wrong here?

2. How do I add motion to my propeller mesh? I know that in "cell zone conditions" you can select mesh motion? But sometimes its greyed out and I dont know why.

3. Just trying to understanding the video I linked in this post, physically, what's the difference between "boundary-1" and "wing-1" in the video. Is "wing-1" the surface of the wing? isnt it also the boundary zone? How come one set to overset and the other is wall?

4. In general, if you could point me to some links to some tutorials or documents beside the Fluent user guide, that would be great too.

Stage 2: repeat stage 1 but put the propeller in a container/box
5. To simplify this situation, lets say I am just putting a stationary wall (large rectangular block) near the propeller for now. This is wall/block considered as the background mesh, or the component mesh? Or in general, everything that is stationary can just be the background mesh??

6. I know that sliding mesh is an alternative but there might be larger interpolation error between moving and stationary mesh interfance compare to the overset mesh, is that right?

Any help would be appreciated!!

Thanks,
Calvin
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