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How to set a 'farfield' boundary for supersonic external flow in OpenFOAM?

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Old   April 5, 2014, 12:54
Default How to set a 'farfield' boundary for supersonic external flow in OpenFOAM?
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everyone, I want to simulate a forward-facing step flow. Specifically, I want to set the top boundary as far field, so that the shock wave could transmit far away. Could somebody tell me how to set the boundary for the top boundary of this case?
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far field, supersonic external flow

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