hai friends, i am working with mutiphase flow in packed bed reactor. my column size is 30(id),1m long,packings are 3mm cylnder racings and spheres , random packing.. in tat while drawing geometry i am getting problem with packing materials.... how to draw the packing material... please help..

Are you unable to use porous media condition?

thank u for responding sir, i am doing my project on cfd simulation of packed bed reactor.. i drawn the outer geometry with given dimensions .. now wat is the procedure to draw porous media condition... some of my friends suggested tat particle tracking.. i think its not suited for this packing section.. please give brief suggestion thank u sir shankar