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Location of coordinate origin (UDF consideration)?

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Old   January 31, 2007, 19:53
Default Location of coordinate origin (UDF consideration)?
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For 2D cartesian simulation(H*D), the symmetry line should be placed on the postion of D/2 or 0.0. That is:

centerling Case 1: -D/2 --- 0.0 ----D/2 (involving negative value) Case 2: 0.0 --- D/2 ----D (completely positive)

Which one is better with considering that I will define a inlet velocity profile by UDF? Or both are the same for UDF internal treatment?

Thanks in advance for your help.

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