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Old   June 3, 2004, 04:53
Default DPM problem!
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welch
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when i calculate a liquid-gas flow, i have to add different forces on the bubbles when they are at different positions. how can i do that?

some one told me that the buoyant force of the bubbles under a sloped static solid wall could be represented by imposing the horizontal gravity acceleration conponent on the plane directly under the wall, but i still don't know how to add the gravity acceleration component on a given plane, it seemed that only in the "operating conditions window" that the gravity acceleration can be defined, by it is refer to the whole system,not to a fixed plane. would you please tell me how to do with these problems?

thanks!
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Old   June 3, 2004, 05:33
Default Re: DPM problem!
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Lior
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Maybe you can do it by defining in the Boundary conditions, under Momentum - the wall velocity or forces acting on the wall. Check it out, might help.
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Old   June 3, 2004, 22:01
Default Re: DPM problem!
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welch
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but it doesn't do. i should add the force on the discrete phase, not the continuous, there are no way to add different force to the bubbles when they are at different positions, right?
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Old   June 4, 2004, 05:17
Default Re: DPM problem!
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Lior
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Maybe there is, by using a UDF. Maybe read abuot UDFs and their use for this purpose. I think it is applicable.
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Old   June 6, 2004, 21:49
Default Re: DPM problem!
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welch
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thanks!using udfs is a way to go,but i still don't know how to add different force on the same bubble with udf when the bubble was at the different positions .
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Old   June 11, 2004, 18:17
Default Re: DPM problem!
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Podila
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Hello I am not clear with forces?? Are they the Drag , lift so on. They can be done in the interactions panel if thats what u are looking for! Podila
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Old   June 13, 2004, 22:06
Default Re: DPM problem!
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welch
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it might help, i'll try, thanks a lot.
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