Different visualization between Fluent and ANSYS CDF post processing results

Gianmario28 · December 4, 2020, 13:38

Good morning to everyone,

I'm trying to model an underexpandend jet impinging a cylindrical obstacle in a square box that is reduced to 1/4 for symmetry.
I make my simulation with ANSYS Fluent and it reaches the convergence criteria. When I visualize the contour plot of the velocity the solution is consistent and I can see the formation of the Mach disk, as predicted by theoryvel_fluent.png.
Meanwhile, when I visualize the same contour plot in CFD post-processing result I obtain a wrong solution when it is possible to see a discontinuity in the velocity fieldvel_CFDpost.jpg.
I don't understand because I have this difference, someone can help me?
Thank you,

Gianmario

AlexanderZ · December 6, 2020, 23:30

use the same range for both pictures

Gianmario28 · December 7, 2020, 04:23

Hi Alexander, thank you for your reply.
I try to use the same range, but the problem persists. Especially the discontinuities in the velocity flow filed shows in the CFD post-processing.
Thank you for your time!

December 4, 2020, 13:38	Different visualization between Fluent and ANSYS CDF post processing results	#1
Gianmario28 New Member Gianmario Ledda Join Date: Oct 2018 Posts: 6 Rep Power: 7	Good morning to everyone, I'm trying to model an underexpandend jet impinging a cylindrical obstacle in a square box that is reduced to 1/4 for symmetry. I make my simulation with ANSYS Fluent and it reaches the convergence criteria. When I visualize the contour plot of the velocity the solution is consistent and I can see the formation of the Mach disk, as predicted by theoryvel_fluent.png. Meanwhile, when I visualize the same contour plot in CFD post-processing result I obtain a wrong solution when it is possible to see a discontinuity in the velocity fieldvel_CFDpost.jpg. I don't understand because I have this difference, someone can help me? Thank you, Gianmario

December 6, 2020, 23:30		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	use the same range for both pictures __________________ best regards ****************************** press LIKE if this message was helpful

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December 7, 2020, 04:23		#3
Gianmario28 New Member Gianmario Ledda Join Date: Oct 2018 Posts: 6 Rep Power: 7	Hi Alexander, thank you for your reply. I try to use the same range, but the problem persists. Especially the discontinuities in the velocity flow filed shows in the CFD post-processing. Thank you for your time!