Courant number of 40 but still produce accurate results. How?

Skh · February 20, 2016, 14:26

Hello everyone,

I'm running a 2D Lid-driven cavity flow of Re=1000 at mesh size of 100x100x1. The solver used in this case is pimpleFoam. I set the maxCo to 40 and the results are fast and very accurate when compared to the results from Ghia et al. (1982). I'm struggling to find the reasoning behind this? I thought Courant number should be less or equal to one. However, for my case, it can go up to 40 and still produce an accurate result. I have attached the links to the files of the case. Thank you all for reading this. I hope somebody can help clarify this situation over here. Thanks

Skh · February 22, 2016, 14:29

http://www.cfd-online.com/Forums/star-ccm/111278-courant-number-cfl-number.html

February 20, 2016, 14:26	Courant number of 40 but still produce accurate results. How?	#1
Skh New Member Sia Join Date: Nov 2015 Posts: 2 Rep Power: 0	Hello everyone, I'm running a 2D Lid-driven cavity flow of Re=1000 at mesh size of 100x100x1. The solver used in this case is pimpleFoam. I set the maxCo to 40 and the results are fast and very accurate when compared to the results from Ghia et al. (1982). I'm struggling to find the reasoning behind this? I thought Courant number should be less or equal to one. However, for my case, it can go up to 40 and still produce an accurate result. I have attached the links to the files of the case. Thank you all for reading this. I hope somebody can help clarify this situation over here. Thanks Last edited by Skh; February 22, 2016 at 14:28.

February 22, 2016, 14:29		#2
Skh New Member Sia Join Date: Nov 2015 Posts: 2 Rep Power: 0	http://www.cfd-online.com/Forums/star-ccm/111278-courant-number-cfl-number.html Last edited by Skh; February 22, 2016 at 14:30. Reason: Sorry for repeating discussion.

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