Non uniform pressure ansys in CFX.

sivaji · August 26, 2011, 03:33

Dear All,
I was completed NACA rotor ansys with uniform pressure at inlet in CFX.I got results, which were almost matched with experimental data. Now i want to do same ansys with non uniform pressure at inlet. If anyone of us know about this process plz share with me and guide me for getting best results.my mailing address is sivajiganesh9@gmail.com. thank you for spending your valuable time.

sivaji · August 26, 2011, 04:52

Quote:

Originally Posted by sivaji

Dear All,
I was completed NACA rotor ansys with uniform pressure at inlet in CFX.I got results, which were almost matched with experimental data. Now i want to do same ansys with non uniform pressure at inlet. If anyone of us know about this process plz share with me and guide me for getting best results.my mailing address is sivajiganesh9@gmail.com. thank you for spending your valuable time.

ghorrocks · August 26, 2011, 06:37

What type of pressure distribution do you want to apply?

sivaji · August 26, 2011, 06:45

Quote:

Originally Posted by ghorrocks

What type of pressure distribution do you want to apply?

Thanq for responding sir, The profile is varied along the radius from Hub to shroud (i.e. i want to take more points near hub and casing and). Its looks curvature at hub & shroud.

ghorrocks · August 26, 2011, 07:02

If you have an expression as a function of position then you can either define a CEL expression or use a 1D or 3D interpolation function.

sivaji · August 26, 2011, 07:13

I dnt have any expression as a function of position, in CFX help file i read as by importing of .CSV file for running this case. I had assumed some points (Pressure values) at hub and casing BCZ i know the Static Pressure range, by plotting graph the Pressure Vs Radius its given curvature which was similar to what i want.But its not running properly after few iterations solutions stops.

ghorrocks · August 26, 2011, 22:12

So is your problem that you cannot implement the varying pressure boundary, or that your model does not converge?

sivaji · August 27, 2011, 00:18

The profile is loading normally but its not creating any results file (i.e. .res file)

sivaji · August 29, 2011, 05:36

Dear Glenn, the inlet pressure profile is loading normally but its not creating any results file (i.e. .res file). I stuked with this case.

ghorrocks · August 29, 2011, 18:42

If it does not produce a res file then either:

1) You told it not to.
2) The solver crashed
3) The solver had a problem reassembling the final results, this sometimes happens in parallel runs.

If it is 1) then well, you can sort that one out.

If it is 2 or 3 then you will need to post the output file (as an attachment) on the forum for us to help you.

August 26, 2011, 03:33	Non uniform pressure ansys in CFX.	#1
sivaji New Member Join Date: Dec 2010 Posts: 6 Rep Power: 15	Dear All, I was completed NACA rotor ansys with uniform pressure at inlet in CFX.I got results, which were almost matched with experimental data. Now i want to do same ansys with non uniform pressure at inlet. If anyone of us know about this process plz share with me and guide me for getting best results.my mailing address is sivajiganesh9@gmail.com. thank you for spending your valuable time.

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August 26, 2011, 06:37		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	What type of pressure distribution do you want to apply?

August 26, 2011, 07:02		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	If you have an expression as a function of position then you can either define a CEL expression or use a 1D or 3D interpolation function.

August 26, 2011, 07:13		#6
sivaji New Member Join Date: Dec 2010 Posts: 6 Rep Power: 15	I dnt have any expression as a function of position, in CFX help file i read as by importing of .CSV file for running this case. I had assumed some points (Pressure values) at hub and casing BCZ i know the Static Pressure range, by plotting graph the Pressure Vs Radius its given curvature which was similar to what i want.But its not running properly after few iterations solutions stops.

August 26, 2011, 22:12		#7
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	So is your problem that you cannot implement the varying pressure boundary, or that your model does not converge?

August 27, 2011, 00:18		#8
sivaji New Member Join Date: Dec 2010 Posts: 6 Rep Power: 15	The profile is loading normally but its not creating any results file (i.e. .res file)

August 29, 2011, 05:36		#9
sivaji New Member Join Date: Dec 2010 Posts: 6 Rep Power: 15	Dear Glenn, the inlet pressure profile is loading normally but its not creating any results file (i.e. .res file). I stuked with this case.

August 29, 2011, 18:42		#10
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	If it does not produce a res file then either: 1) You told it not to. 2) The solver crashed 3) The solver had a problem reassembling the final results, this sometimes happens in parallel runs. If it is 1) then well, you can sort that one out. If it is 2 or 3 then you will need to post the output file (as an attachment) on the forum for us to help you.