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Contours Showing Differences in CFD-Post

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Old   April 10, 2014, 23:32
Default Contours Showing Differences in CFD-Post
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Ali Sarami
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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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Old   April 10, 2014, 23:57
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Quote:
Originally Posted by a.sarami View Post
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.
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Old   April 11, 2014, 00:06
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Ali Sarami
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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
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Old   April 11, 2014, 02:21
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Lance
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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.
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