Pulsatile Flow Simulation With CFX

ashtonJ · November 14, 2010, 03:43

Hi everyone

I simulated a pulsatile flow in an artery. A waveform velocity distribution is used as inlet boundary condition. I applied Average Static Pressure as the outlet boundary condition and set it to 93 mmHg. Reference pressure is set to 1 atm. While solving the problem in CFX solver, the following notice is shown:

A wall has been placed at portion(s) of an OUTLET
boundary condition (at 15% of the faces, 5 % of the area)
to prevent fluid from flowing into the domain.

The boundary condition name is: Outlet.
The fluid name is: Fluid 1.

If this situation persists, consider switching to an Opening type boundary condition instead

Please let me know what the problem of my simultion is.

Kind regards
Ashton

ghorrocks · November 14, 2010, 05:57

This is discussed in the CFX documentation and also on this forum a million times. Do a search of the doco and this forum for the answer.

In short an outlet does not allow backflow so the flow was stopped in that section of the outlet. If the backflow is real then use a opening to more correctly model it.

November 14, 2010, 03:43	Pulsatile Flow Simulation With CFX	#1
ashtonJ Senior Member Ashkan Javadzadegan Join Date: Sep 2010 Posts: 255 Rep Power: 17	Hi everyone I simulated a pulsatile flow in an artery. A waveform velocity distribution is used as inlet boundary condition. I applied Average Static Pressure as the outlet boundary condition and set it to 93 mmHg. Reference pressure is set to 1 atm. While solving the problem in CFX solver, the following notice is shown: A wall has been placed at portion(s) of an OUTLET boundary condition (at 15% of the faces, 5 % of the area) to prevent fluid from flowing into the domain. The boundary condition name is: Outlet. The fluid name is: Fluid 1. If this situation persists, consider switching to an Opening type boundary condition instead Please let me know what the problem of my simultion is. Kind regards Ashton

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November 14, 2010, 05:57		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	This is discussed in the CFX documentation and also on this forum a million times. Do a search of the doco and this forum for the answer. In short an outlet does not allow backflow so the flow was stopped in that section of the outlet. If the backflow is real then use a opening to more correctly model it.