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UDF for DPM velocity, relative or real one?

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Old   January 26, 2011, 16:11
Default UDF for DPM velocity, relative or real one?
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Litao
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Hey, folks,

I just noticed this problem, is the velocity UDF used for DPM module a relative speed to fluid, or it is already the actual speed,

that is, like, P_VEL(p)[i], what will get?


thx!!
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Old   June 14, 2012, 09:48
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Na Zhao
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Quote:
Originally Posted by Zeallt View Post
Hey, folks,

I just noticed this problem, is the velocity UDF used for DPM module a relative speed to fluid, or it is already the actual speed,

that is, like, P_VEL(p)[i], what will get?


thx!!

so zeallt, do you solve the problem? because i have the same question now and i find that if the velocity in injection set the same with the boudary condition , the simulation results are not acceptable.

Na
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Old   February 27, 2015, 15:40
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B_Kia
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it will get the velocity of the particle , not relative velocity!
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Old   March 4, 2015, 18:41
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Rastko Jovanovic
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P_VEL(p)[i] gives particle velocity (not relative velocity) components.
i takes values 0,1,2 corresponding to x-, y-, z- velocity components.
Refer to DEFINE DPM_SPRAY_COLLIDE udf example, there is an expression for relative velocity calculation in it.
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