Distribution in the inlet boundary condition

BalanceChen · May 25, 2011, 09:10

Hi all, I am doing a whole cycle simulation of a compressor stage using ANSYS CFX12.0, the inlet boundary condition is Total Pressure, but this total pressure is not merely a value, it is a circumferential distribution. Does CFX can figure it out, how? Thank you firstly,

Sincerely,

BalanceChen

ghorrocks · May 25, 2011, 18:56

If you know the circumferential distribution then you can apply that as a boundary condition.

If you do not know the distribution you cannot use this boundary condition. Obviously if you do not know the pressure you cannot define a pressure boundary.

BalanceChen · May 25, 2011, 21:06

I am sorry that i did not put the question clearly. In fact I know the pressure distribution, and I wonder how to apply this circumferential distribution as a boundary.

pratikmehta · May 27, 2011, 03:50

All you have to do is to define a function like a XY plot that will define the pressure distribution as you want & use it as an boundary condition. Other way could be to use step function to define your inlet boundary total pressure settings.

I hope this helps

cheers
Pratik

BalanceChen · May 27, 2011, 03:54

Thank you very much, pratikmehta, I will make a try.

May 25, 2011, 09:10	Distribution in the inlet boundary condition	#1
BalanceChen Member Join Date: Sep 2010 Posts: 45 Rep Power: 15	Hi all, I am doing a whole cycle simulation of a compressor stage using ANSYS CFX12.0, the inlet boundary condition is Total Pressure, but this total pressure is not merely a value, it is a circumferential distribution. Does CFX can figure it out, how? Thank you firstly, Sincerely, BalanceChen

May 25, 2011, 18:56		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,729 Rep Power: 143	If you know the circumferential distribution then you can apply that as a boundary condition. If you do not know the distribution you cannot use this boundary condition. Obviously if you do not know the pressure you cannot define a pressure boundary. BalanceChen likes this.

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May 25, 2011, 21:06		#3
BalanceChen Member Join Date: Sep 2010 Posts: 45 Rep Power: 15	I am sorry that i did not put the question clearly. In fact I know the pressure distribution, and I wonder how to apply this circumferential distribution as a boundary.

May 27, 2011, 03:50		#4
pratikmehta Member Pratik Mehta Join Date: Mar 2009 Posts: 32 Rep Power: 17	All you have to do is to define a function like a XY plot that will define the pressure distribution as you want & use it as an boundary condition. Other way could be to use step function to define your inlet boundary total pressure settings. I hope this helps cheers Pratik

May 27, 2011, 03:54		#5
BalanceChen Member Join Date: Sep 2010 Posts: 45 Rep Power: 15	Thank you very much, pratikmehta, I will make a try.