udf of body-force and the step of couple compute
 

Dear all: My udf for particle body force is: #include "udf.h" #include "dpm.h" #include "surf.h" #define C1 0.00000000000000000000000148 DEFINE_DPM_BODY_FORCE(p_b_force,p,i) { real bforce; if(i==1) bforce=0.0; else if(i==0) bforce=C1*P_POS(p)[0]*P_POS(p)[0]; return (bforce/P_MASS(p)); }

when I compiled it into Fluent6.2,and couple compute it between the gas and particle(disctete phase),I couldn`t see the tracking particle deflexion. The track just is a beeline.Dosen`t the force effect on the particle? Who have been do these works before? Can you tell me how to set the couple compute between the gas and particles?????? I want to know where is the error? Thanks so much!