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Old   July 1, 2007, 07:16
Default Boundary Conditions
  #1
Sameer
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Dear All.

I am trying to simulate a multiphase-multicomponent problem. In my problem there is a cylinder with two inlets ( each at upper and lower ends) and same way two outlets . Cylinder is continuously stirred. I know the mass flowrates at inlets. What conditions should I define at outlets? Awaiting for your valuable suggestions.

Thanks.

Sameer
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Old   July 2, 2007, 01:22
Default Re: Boundary Conditions
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priya
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you can give the static pressure at the outlet.

In CFX if u see u could see a valid combinations of BC just follow that.

It would be better if ur able to determine the velocity at one of the outlet.

U havent specified what kind of flow it is either sub sonic or supersonic. based on that too it differs
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Old   July 2, 2007, 04:12
Default Re: Boundary Conditions
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Sameer
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Hi Priya.

Thanks for your suggestions. The flow in my problem is sub- sonic. I know the velocities at both outlets; but will it be a robust combination if i define mass flowrate at inlet and velocity at outlet?

Regards

Sameer
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Old   July 3, 2007, 00:55
Default Re: Boundary Conditions
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priya
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rather than giving more robust condition robust condition solves better. I too have faced a similar kind of prob but with single inlet and 2 outlet. robust gives better

If u want to determine pr variation from the inlet its better to give total pressure at the inlet and velocity at the outlet and solve
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