computational fluidization of irregular particles using fluent 6.3
 

i have done phase holdup analysis of gas-liquid-solid fluidized bed using regular sized particles in fluent 6.3. Standard k-ε dispersed eulerian multiphase model with standard wall functions were used.now while using for irregular particles,which model should be used. i want to know if it can be done without using udf and if possible how to enter the average sphericity value when udf is not used. please help me out :)