Hi: I simulation particle flow in tube. sometimes particle will hit wall and will get bad result in particle residence time. Can anyone tell me when particle hit wall , how it to do particle trajectory calculation ? Do you have good way to solve this problem when particle hit wall?

Once you have defined your injection of particles and ran a ParticleTrack, you can set the Wall Properties in Define/BoundaryConditions. You will be able to set a law for particles behaviour on the wall. Of course, the law used to define the rebound of particles may vary from one material to another.

Hi: I have set when particle hit wall,and it will rebound. But I really surprised that particle seems hit wall and it will run out off wall . I check particle¡¦s position , It seems that particle ¡¥s mass of center will hit wall , then it will rebound . I think it is not correct . Particle will hit wall , but I think it should not to be particle ¡¥s mass of center . I think particle should hit wall when particle ¡¥s outer surface touch wall. I want get information of particle ¡¥s residence time . But this way seems will not get correct residence time, computer will calculation residence time until particle ¡¥s mass of center hit wall.

Sometimes particle will hit wall and walk along wall in low velocity with particle¡¦s mass of center. All of above will not induce correct result ,especially in my big particle. Can you tell me some good way to improved my result .

Thanks!!!