Contours Showing Differences in CFD-Post

a.sarami · April 10, 2014, 23:32

Dear Friends,

I have simulated two different states (with different boundary conditions) for a single mesh in CFX. So I have two different .res files each for one state.

Now, I would like to plot contours in CFD-Post showing the difference in WallShearStress between state 1 and state 2. For example something like that:

(WSS1-WSS2) / WSS1 * 100 ---> (Percentage Difference)

See, I would like CFD-Post to calculate the above parameter for each point of my mesh and plot the contours accordingly.

Would you please help me how to do that?

Thank you

Antanas · April 10, 2014, 23:57

Quote:

Originally Posted by a.sarami

Dear Friends,

I have simulated two different states (with different boundary conditions) for a single mesh in CFX. So I have two different .res files each for one state.

Now, I would like to plot contours in CFD-Post showing the difference in WallShearStress between state 1 and state 2. For example something like that:

(WSS1-WSS2) / WSS1 * 100 ---> (Percentage Difference)

See, I would like CFD-Post to calculate the above parameter for each point of my mesh and plot the contours accordingly.

Would you please help me how to do that?

Thank you

Load two cases into CFD-post (use "Keep current cases loaded" checkbox) and use "Case comparison" in outline tree.

a.sarami · April 11, 2014, 00:06

Thank you Antanas for your message. But this gives me only the differences (WSS1-WSS2) not the percentage differences ( (WSS1-WSS2)/WSS1*100). I need to see the percentage differences.
Best

Lance · April 11, 2014, 02:21

You can make your own variable that shows %-difference with the Wall Shear Stress.Difference variable. See documentation on how to make a new variable.

Note that for a vectorial variable the <variable>.Difference is not the difference in magnitude between file 1 and 2. Again, see the documentation.

April 10, 2014, 23:32	Contours Showing Differences in CFD-Post	#1
a.sarami Member Ali Sarami Join Date: Jun 2010 Posts: 34 Rep Power: 15	Dear Friends, I have simulated two different states (with different boundary conditions) for a single mesh in CFX. So I have two different .res files each for one state. Now, I would like to plot contours in CFD-Post showing the difference in WallShearStress between state 1 and state 2. For example something like that: (WSS1-WSS2) / WSS1 * 100 ---> (Percentage Difference) See, I would like CFD-Post to calculate the above parameter for each point of my mesh and plot the contours accordingly. Would you please help me how to do that? Thank you

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April 11, 2014, 00:06		#3
a.sarami Member Ali Sarami Join Date: Jun 2010 Posts: 34 Rep Power: 15	Thank you Antanas for your message. But this gives me only the differences (WSS1-WSS2) not the percentage differences ( (WSS1-WSS2)/WSS1*100). I need to see the percentage differences. Best

April 11, 2014, 02:21		#4
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 22	You can make your own variable that shows %-difference with the Wall Shear Stress.Difference variable. See documentation on how to make a new variable. Note that for a vectorial variable the <variable>.Difference is not the difference in magnitude between file 1 and 2. Again, see the documentation.