dear zhaobingtao,
i am sorry i have to answer you in english at this moment.
first of all , i am not in Jiaotong Univercity.
About your quenstion, between the vortex finder and the dust outlet, there should be a cone, and then unit the cone and the vortex finder. You should split it from the main body. Always remember the two should be connected.
I am just wondering what is the split关系, i never heard it.
Don't determine all of the wall of cyclone into the wall condition. you can just define the wall of the vortex finder and the dust outlet( if you concern the separation efficiency).
dear warmsavage,
you'd better use the Stochastic tracking, because of the effect of turbulance. By the way , you should think about the particles which is imcompleted. Maybe you should add it to the 捕集s.
I suggest you should read the documents carefully.
good luck