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csmistry September 14, 2009 07:22

rotating domain
 
i want to simulate rotating sphere...for rotating mesh option the domain required is fluid and my sphere is solid !!!!!!!! what to do.

one of senior collegue has given me advice of tangential velocity how to impliment it... in non of the tutorial this idea is given...

guide me

ghorrocks September 14, 2009 18:34

If the sphere does not translate but only rotates then use a fixed mesh with tangential velocities applied to the sphere surface. You can use a CEL expression to do this. Make a function which evaluates UVW velocity as a function of XYZ location on the surface and apply it as a moving wall.

paulo September 15, 2009 13:03

Hi,

There is also another way. When you select the sphere as a 'wall' boundary condition, you can set the velocity of it (in the BC setup window), as a rotating wall, giving the angular velocity and the axis of rotation.

Best Regards,

Paulo Rocha

Mehul157@yahoo.com September 16, 2009 00:35

Hi CSMistry,

It seems to me that , you are trying to simulate the rotational effects of the solid ball in the fluid. If I am understanding your problem correctly , then my advice is that you please form one peusdo domain around your sphere. This will act as the fluid interface. I have done similar kind of simulations , but in my case I was using the agitator body instead of sphere. Anyway after creating the peudo domain , mesh the sphere and the rest of the body seperately. Define the solid sphere with the body point and assign it as orphen in meshing. the solid will not be meshed from inside, only surface will be meshed. Now during Pre stage you import both separately meshed items individually and assign the sphere as rotating and the otherone as steady.


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