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how to use Up Stream boundary condition in open channel Flow

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Old   April 18, 2010, 14:38
Unhappy how to use Up Stream boundary condition in open channel Flow
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mohammad sadegh jafarinik
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hi all
i have a problem to modelling open channel flow ,when i put the pressure inlet for Up Stream boundary condition that means i put the depth of water in channel ,but after the running , at 2 or 3 meter down the Up Stream boundary condition the depth is decrease and all the computation be incorrect.any one can help me?
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