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how ot simulate orifice valve

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Old   April 4, 2007, 07:07
Default how ot simulate orifice valve
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ammi reddy
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hi i am simulating a flow through the pipe 2d .their is a orifice in the pipe , sometime 20%opened, some time 25%, 30% and so on......... i can't go for geometry change as a lot of modeling (with diffferent opening )is to be done.how can it be solved. is UDF is require for it ? can u send a related udf ? please reply .

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