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which BC for getting outlet pressure in a channel flow

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Old   February 8, 2015, 09:43
Default which BC for getting outlet pressure in a channel flow
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Hi all, i have just started studying ansys fluent. what i have to find is the pressure drop in a microchannel with a specified velocity inlet and length of pipe. Nothing is known about outlet conditions. the outlet pressure need not be atmospheric. In such a case what should be my outlet boundary condition? how can i get the outlet pressure. when i m applying pressure outlet BC with zero gauge pressure i m always getting zero gauge pressure at outlet, but i need the actual pressure at outlet....somebody plz help me
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Old   February 8, 2015, 15:39
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Why are you interested in the absolute pressure at the outlet if you're aiming at the pressure drop in the pipe?r
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Old   February 9, 2015, 00:56
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sorry, now i understand even my question was wrong.....when i changed the outlet pressure values with pressure outlet BC the pressure drop remained the same. i m interested only in the pressure drop. But initially i thought wen i m fixing inlet velocity and channel dimensions i m fixing inlet pressure also....thats why asked such a question....do you want to add anything more?
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Old   February 9, 2015, 14:59
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Correct. You don't want to overcostrain your system. If you impose a pressure at the outlet the pressure at the inlet will be calculated in order to have a certain (imposed) velocity at that location.
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