Courant number in transient multiphase flow

pszor · July 26, 2018, 06:58

Hello.

I've read fluent tutorials and it is stated that the Courant number should be between 1 and 10 in transient multiphase flow.

In my opinion, Courant should be always below one for explicit methods. Can you explain to me why it is adviced to use a Courant between those numbers?

Thanks

LuckyTran · July 29, 2018, 11:46

Which multiphase model are you using and are you using an explicit one? If you use an implicit solver then you don't need Co<1 and this number isn't even 1 for every problem.

Everyone has their opinions. You say less than 1 but does that mean 0.001 or 0.99 and also why?

July 26, 2018, 06:58	Courant number in transient multiphase flow	#1
pszor New Member Join Date: Jul 2018 Posts: 1 Rep Power: 0	Hello. I've read fluent tutorials and it is stated that the Courant number should be between 1 and 10 in transient multiphase flow. In my opinion, Courant should be always below one for explicit methods. Can you explain to me why it is adviced to use a Courant between those numbers? Thanks

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July 29, 2018, 11:46		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,763 Rep Power: 66	Which multiphase model are you using and are you using an explicit one? If you use an implicit solver then you don't need Co<1 and this number isn't even 1 for every problem. Everyone has their opinions. You say less than 1 but does that mean 0.001 or 0.99 and also why?