Flow direction in 2D

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Author Message   paeza Member Username: paeza Post Number: 5 Registered: 07-2009 Posted on Wednesday, March 31, 2010 - 01:23 am:    Dear Dr. Nelson At this moment, I am trying to model the flow of temperature and oxygen through a compost pile. The air flow is coming from the left and right boundaries then it moves up toward the top boundary. I use the continuity equation to determine the flow speed in x and y direction. In my code, the flow direction seem to be wrong and I am not quite sure how to fix it. So it would be nice if you could give me some advices about this. I also attached my code and the flow direction that I want to do. Thank you so much flowtest.pde (3.0 k) flow direction.pdf (33.3 k)   rgnelson Moderator Username: rgnelson Post Number: 1340 Registered: 06-2003 Posted on Friday, April 02, 2010 - 12:37 pm:    On one sidewall of your system, you have used a Natural(psi)=1e-3 boundary condition, and on the other a Value(psi)=1e-3. A constant value of psi means that there can be no flow through the boundary. If you change the Value to a Natural, you will get the flow pattern you want.