Problem on boundry of two phase flow
hi,all I have trouble to define an outlet of gassolid two phase flow, which gas phase can pass through while solid phase can't. How can i achieve this.

Re: Problem on boundry of two phase flow
I assume that you are talking about an eulereuler solution. I had a similar problem once (in CFX4.4), I think I solved the problem by setting ambient conditions for the solid phase to zero and solved the problem as transient. (I had to solve it transient because I only had one outlet and the solver will try in a steady state to equalize inletoutlet.) Hope it helps

Re: Problem on boundry of two phase flow
Thank you for your suggestion. you are right, i am talking about an eulereuler solution and my problem is similar with the one you once meet. But my problem still remains. My problem is as follow: Gassolid flow goes into a tank through an inlet and there is an outlet which only gas can pass through. so the solid remains in the tank. But i do not know how to difine such an outlet in CFX4.4. I have tried several times with different method. 1. I define INLET and MASS FLOW BOUNDARY as the inlet and outlet and define the flux of the MASS FLOW BOUNDARY as 1*1.0 and 1*0.0. The result is both gas and solid phase pass through the MASS FLOW BOUNDARY. 2. I define PRESSURE and MASS FLOW BOUNDARY as the inlet and outlet and define the flux of the MASS FLOW BOUNDARY as 1*1.0 and 1*0.0. The result is no solid came into the tank through the inlet. 3. I define INLET and MASS FLOW BOUNDARY as the inlet and PRESSURE and define the normal velocity of the oulet as zero by using USRBCS. The result is both gas and solid phase pass through the MASS FLOW BOUNDARY. 4. I want to define the outlet as Porous walls. But I do not know how to define.
Best regards! 
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