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udf_square wave profile

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Old   March 8, 2006, 10:38
Default udf_square wave profile
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Hi How do I generate a square wave profile for a velocity inlet boundary condition?my velocity needs to have a square profile from -20 to 20 and it has a frequency of 200 Hz.I do not know how to write this as a UDF code. Can someone please help me? thanks.

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