Error in comparison of two cases with a domain at different locations CFD Post

aadicfd · May 13, 2021, 19:16

I have two transient simulation cases for the same model of a radial turbine where one of the domains (the blade) in both the cases is at a different angle because of differences in timesteps. When I do the case comparison, the ANSYS does not show the difference between the two cases, instead, the view with the difference is just a blank screen. Does anyone know the reason for this and how to solve this issue?
Thank you!

Gert-Jan · May 14, 2021, 07:01

I think that if the timesteps don't match, then Post can't compare them. Because the position of your turbine and mesh do not match.

In your case, I think you can only compare the final position (if they are similar) and compare time averaged results. And standard deviation, if you have caculated them.

May 13, 2021, 19:16	Error in comparison of two cases with a domain at different locations CFD Post	#1
aadicfd New Member Aaditya Join Date: Apr 2021 Posts: 19 Rep Power: 5	I have two transient simulation cases for the same model of a radial turbine where one of the domains (the blade) in both the cases is at a different angle because of differences in timesteps. When I do the case comparison, the ANSYS does not show the difference between the two cases, instead, the view with the difference is just a blank screen. Does anyone know the reason for this and how to solve this issue? Thank you!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Post Processing Results: Ansys Workbench 18.2 - Fluent - CFD Post - Porous Body	onlycfd	CFX	4	April 29, 2021 03:02
Post Processing Results: Ansys Workbench 18.2 - Fluent - CFD Post - Porous Body	onlycfd	FLUENT	0	April 28, 2021 23:41
[ICEM] How to generate an unstructured mesh for a 2 fluid domain rotor in ICEM CFD	Hazem24	ANSYS Meshing & Geometry	0	December 21, 2020 06:52
Post processing journal - like .cst in CFD Post	Jiricbeng	FLUENT	0	April 24, 2019 08:08
CFD Post Case Comparison	akarlin	CFX	0	March 3, 2013 20:52

May 14, 2021, 07:01		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	I think that if the timesteps don't match, then Post can't compare them. Because the position of your turbine and mesh do not match. In your case, I think you can only compare the final position (if they are similar) and compare time averaged results. And standard deviation, if you have caculated them.