pisoFoam error - Courant blows up

leonidassr · May 12, 2014, 04:30

Hey all,
I am having trouble with my LES on a 10 million node grid.
after many iterations (more than 10000), my solution blows up.
I have started running from a steady solution obtained from a k-omega SST simulation.

While my velocity residuals are approximately of the order of 1e-5, the courant seems to increase bit by bit and after some time it blows up.
This also leads the velocity residuals and the time step continuity errors to blow up as well.

Do you have any clue where the origin of the problem might be? Some advice?

nimasam · May 13, 2014, 09:31

general tips for general question

,
use first order scheme and when you reach a converged solution changed it into second order scheme

May 12, 2014, 04:30	pisoFoam error - Courant blows up	#1
leonidassr New Member Leonidas Siozos-Rousoulis Join Date: Jan 2013 Location: Brussels, Belgium Posts: 11 Rep Power: 13	Hey all, I am having trouble with my LES on a 10 million node grid. after many iterations (more than 10000), my solution blows up. I have started running from a steady solution obtained from a k-omega SST simulation. While my velocity residuals are approximately of the order of 1e-5, the courant seems to increase bit by bit and after some time it blows up. This also leads the velocity residuals and the time step continuity errors to blow up as well. Do you have any clue where the origin of the problem might be? Some advice?

May 13, 2014, 09:31		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,266 Blog Entries: 1 Rep Power: 24	general tips for general question , use first order scheme and when you reach a converged solution changed it into second order scheme __________________ My Personal Website (http://nimasamkhaniani.ir/) Telegram channel (https://t.me/cfd_foam)

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