Acoustic Courant Number for Supersonic analysis

Sparsh · October 6, 2015, 14:56

I'm doing a supersonic transient analysis for which my time step is 0.001s resulting acoustic courant number in CFX is 999.
would it be advisable to decrease my time step and increasing coefficient loops to 5+?
1) domain is 15x10x10 'unit' lengths
2) supersonic analysis

ghorrocks · October 6, 2015, 18:47

CFX is an implicit solver and the Courant number is not a limiting parameter. You choose a time step size which gives you accurate results and converges properly. Don't worry about the Courant number.

October 6, 2015, 14:56	Acoustic Courant Number for Supersonic analysis	#1
Sparsh New Member Sparsh Join Date: Jul 2015 Location: Moscow Posts: 10 Rep Power: 11	I'm doing a supersonic transient analysis for which my time step is 0.001s resulting acoustic courant number in CFX is 999. would it be advisable to decrease my time step and increasing coefficient loops to 5+? 1) domain is 15x10x10 'unit' lengths 2) supersonic analysis

October 6, 2015, 18:47		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	CFX is an implicit solver and the Courant number is not a limiting parameter. You choose a time step size which gives you accurate results and converges properly. Don't worry about the Courant number. Sparsh likes this.

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