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Old   June 7, 2010, 15:59
Default Moving fluid vs moving body
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Hi everybody, I have a question for you:
every time I run a simulation the fluid is moving while the body is still. That means that the situation is similar to the one you would find in a wind tunnel with all it's disadvantages.
So I was thinking about moving the body while the rest of the domain is still. The ground should be a wall if the body is a car and the other domain faces could be simmetry plane or a pressure condition could be imposed on them.

Would it be a good idea? Is there something I'm missing? What do you think?

Thanx


Lorenzo
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Old   June 7, 2010, 17:04
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Lorenzo,

In order to eliminate boundary layer of the ground(wall which is under the car) while flow is moving, I give the ground "velocity inlet" boundary condition with "magnitude and direction" option. Also except symmetry plane and outflow, everywhere is velocity inlet.
By this way, I think I get a good approach like the real world.
Hope it makes sense to you.
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Old   June 8, 2010, 03:58
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Yess, that's what I do as well. I was just wondering which would be the difference between setting a case like you described and setting one like I described.
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