pressure data not saved in cgns file from CFX

rnl · July 24, 2012, 08:26

We've run a transiet simulaton of a wave energy device in CFX 14.0 and are trying to get surface pressure data in a tabular format from teh restuls for each timestep for use in a structural analysis.

We've saved the cgns files for each timestep, and specified surface pressure be saved, but when the cgns files aer opened in tecplot the pressure is read as zero. Any ideas what is going wrong here? Or any ideas on how to get the data out in a useable format for passing on to other people (who don't have ANSYS)?

Cheers
Rach

Felggv · July 24, 2012, 13:59

Wouldn't a curve be useful? Maybe you could plot Pressure - position.

Just a hint.

EDIT: I've just did something that I think would help you. I've created a chart of Temperature - Time and after it's done you can go on the data series tab and export it in *txt format like a table, after you've done that, feel free to plot it using MATLAB or any other software you like.

cfdgremlin · July 25, 2012, 08:01

I don't think the problem is with CFX. I've exported transient CGNS surface data before for passing to a noise analysis program and have not had any problems.

You might want to check that the values in the CGNS files are actually non-zero - you can do this by viewing them in a tool such as ADFViewer (freely available from the CGNS site).

Alternatively, as mentioned above, you might just want a curve of (average) pressure vs time on a surface, in which case create a monitor point and export it from the solver manager at the end of the run.

CG

Aquaman · August 6, 2017, 22:20

I need the surface pressure for noise computation and exported the pressure data in .cgns format. The while data is zero. What should I do to solve this problem?

Quote:

Originally Posted by cfdgremlin

I don't think the problem is with CFX. I've exported transient CGNS surface data before for passing to a noise analysis program and have not had any problems.

You might want to check that the values in the CGNS files are actually non-zero - you can do this by viewing them in a tool such as ADFViewer (freely available from the CGNS site).

Alternatively, as mentioned above, you might just want a curve of (average) pressure vs time on a surface, in which case create a monitor point and export it from the solver manager at the end of the run.

CG

July 24, 2012, 08:26	pressure data not saved in cgns file from CFX	#1
rnl New Member Rachel Join Date: Jul 2012 Posts: 1 Rep Power: 0	We've run a transiet simulaton of a wave energy device in CFX 14.0 and are trying to get surface pressure data in a tabular format from teh restuls for each timestep for use in a structural analysis. We've saved the cgns files for each timestep, and specified surface pressure be saved, but when the cgns files aer opened in tecplot the pressure is read as zero. Any ideas what is going wrong here? Or any ideas on how to get the data out in a useable format for passing on to other people (who don't have ANSYS)? Cheers Rach

July 24, 2012, 13:59		#2
Felggv Member Felipe Gobbi Join Date: Apr 2012 Location: Brazil Posts: 76 Rep Power: 14	Wouldn't a curve be useful? Maybe you could plot Pressure - position. Just a hint. EDIT: I've just did something that I think would help you. I've created a chart of Temperature - Time and after it's done you can go on the data series tab and export it in txt format like a table, after you've done that, feel free to plot it using MATLAB or any other software you like. Last edited by Felggv; July 24, 2012 at 15:17.*

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July 25, 2012, 08:01		#3
cfdgremlin Member Join Date: Dec 2009 Posts: 44 Rep Power: 16	I don't think the problem is with CFX. I've exported transient CGNS surface data before for passing to a noise analysis program and have not had any problems. You might want to check that the values in the CGNS files are actually non-zero - you can do this by viewing them in a tool such as ADFViewer (freely available from the CGNS site). Alternatively, as mentioned above, you might just want a curve of (average) pressure vs time on a surface, in which case create a monitor point and export it from the solver manager at the end of the run. CG