finite volume method and finite difference method

harishkamat100 · December 21, 2020, 05:46

Hi
Can we compare the results obtained from the finite volume method (ANSYS fluent) and the finite difference method (MATLAB) for validation. Whether results obtained from both methods will be same?

pakk · December 21, 2020, 12:22

Of course you can compare them. Plot them both, and see if they agree, who is stopping you?

If you are solving the same physical problem, both with proper numerical settings, the results should be the same (within numerical accuracy). Otherwise one of the two methods would be conceptually wrong.

harishkamat100 · December 21, 2020, 23:25

Thank you for the info.
Actually, the following literature mentioned that results won't be the same.
"CFD analysis of journal bearing hydrodynamic lubrication by Bingham lubricant"

pakk · December 21, 2020, 23:52

That just means one of the two does not have proper numerical settings. If they did, they should both approximate reality, and therefore each other.

How to tell if they have proper numerical settings, that is a different, much more difficult story.

December 21, 2020, 05:46	finite volume method and finite difference method	#1
harishkamat100 New Member Harishkumar Join Date: Dec 2018 Location: India Posts: 9 Rep Power: 7	Hi Can we compare the results obtained from the finite volume method (ANSYS fluent) and the finite difference method (MATLAB) for validation. Whether results obtained from both methods will be same?

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December 21, 2020, 12:22		#2
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 26	Of course you can compare them. Plot them both, and see if they agree, who is stopping you? If you are solving the same physical problem, both with proper numerical settings, the results should be the same (within numerical accuracy). Otherwise one of the two methods would be conceptually wrong.

December 21, 2020, 23:25		#3
harishkamat100 New Member Harishkumar Join Date: Dec 2018 Location: India Posts: 9 Rep Power: 7	Thank you for the info. Actually, the following literature mentioned that results won't be the same. "CFD analysis of journal bearing hydrodynamic lubrication by Bingham lubricant"

December 21, 2020, 23:52		#4
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 26	That just means one of the two does not have proper numerical settings. If they did, they should both approximate reality, and therefore each other. How to tell if they have proper numerical settings, that is a different, much more difficult story.