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back flow at pressure out flow boundary condition

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Old   December 8, 2009, 00:42
Default back flow at pressure out flow boundary condition
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I am a new member. I am using Mixing plane model for a case related to turbo-machinery application. I modeled the mixing pair as Pressure out let and Velocity inlet . I am getting reverse flow at pressure outlet boundary condition and hence the flow is not developing down stream.
How to set back pressure parameters (explain in detail). Further, suggest other measures/modifications.
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