# UDF problem!

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 March 10, 2003, 04:58 UDF problem! #1 ann Guest   Posts: n/a Hi, I simulate gas-solid two-phase flow using discrete phase model. I want to simulate a body force on particles using UDF. But in the force expression, there are varibles about gas phase such as gas velocity, gas density. My C code using UDF is as following: #include "udf.h" #include "dpm.h" DEFINE_DPM_BODY_FORCE(forcerot, p, i) { float forcerot; forcerot=C_R(c,t)/P_RHO(p)*x[0]*C_V(c,t); return(forcerot); } where P_RHO(p) (particle density) can obtain, but C_R(c,t) (gas density)£¬x[0] (x component of location)£¬ C_V(c,t) (y component of gas velocity) are unknown. How can I get the values of these variables? Thanks for any help in advance! Regards, ann

 March 12, 2003, 21:42 Re: UDF problem! #2 hedonists Guest   Posts: n/a I have the same problem, too. I tried to write a UDF of the drag force, taking into account the slip correction factor which is a function of local Pressure and Temperature. And I could not obtain the pressure values for the current particle position. For your problem, I guess you can assume the gas temperature to be equal to the particle temperature, and you can obtain the particle temperature using the Macro P_T(p).

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