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October 29, 2011, 13:25 |
Help me please
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#1 |
New Member
Lubomir
Join Date: Oct 2011
Posts: 1
Rep Power: 0 |
Hi Guys.
I have an unsolvable problem. I am beginner in CFD. I would like to model Karman vortex trail - school experiment. Real experiment: Pipe is placed in center of river. Behind the pipe are generated Karman vortexes. I know the velicity inlet. That´s all. The problem: I have mesh(Gambit) of this problem, 2D solution. What are the boundary types for outlet and for two side edges? I tried calculation but after 12000 iterations were no convergence - still oscilated. I am not sure if I set all the parameters right. Can You help me? Please give me advise what,where and how I must set Thanks. |
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October 30, 2011, 15:25 |
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#2 |
Member
anonym
Join Date: Mar 2009
Posts: 65
Rep Power: 17 |
Boundary conditions for outlet: outflow or pressure-outlet (with the proper pressure value)
The walls should be simply wall Since the simulation of Kármán vortexes is transient, you should go for time-dependent simulation. Did you do that? From the oscillating residuals I guess you didn't. |
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