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May 8, 2018, 10:16	external disturbance	#1
zese Senior Member Zese Join Date: Sep 2013 Posts: 102 Rep Power: 12	Hi everyone, I'm gonna simulate fluid flow in a pipe which an external disturbance in the form of azimuthally spinning waveform (exp(i(theta)-i(omega*t)) is imposed in a special location of the pipe. I have no idea how to set this condition in CFX using UDF. I will be grateful if you help me.

May 8, 2018, 15:13		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,804 Rep Power: 32	You can use the CFX Expression Language (CEL). There are several tutorials illustrating how to use CEL for boundary conditions

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