convergence problem

Danial1992 · April 13, 2017, 05:13

Dear friends,
I am just modeling a 2D water channel flow, using k-epsilon and one phase model and steady mode. as I set the the inlet with a low velocity (like 0.1 m/s) it doesn't converge. but as I set it high velocity( like 5 m/s) it converge easily. what is the problem? what should I do?

LuckyTran · April 13, 2017, 13:25

Try a different initial guess. I'm assuming the channel flow is already turbulent at 0.1 m/s, but is it possible that 0.1 m/s should be laminar?

Danial1992 · April 14, 2017, 09:54

Quote:

Originally Posted by LuckyTran

Try a different initial guess. I'm assuming the channel flow is already turbulent at 0.1 m/s, but is it possible that 0.1 m/s should be laminar?

I tried laminar but it didn't work.

April 13, 2017, 05:13	convergence problem	#1
Danial1992 Member Danial Join Date: Mar 2017 Posts: 40 Rep Power: 9	Dear friends, I am just modeling a 2D water channel flow, using k-epsilon and one phase model and steady mode. as I set the the inlet with a low velocity (like 0.1 m/s) it doesn't converge. but as I set it high velocity( like 5 m/s) it converge easily. what is the problem? what should I do?

April 13, 2017, 13:25		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,668 Rep Power: 65	Try a different initial guess. I'm assuming the channel flow is already turbulent at 0.1 m/s, but is it possible that 0.1 m/s should be laminar? Danial1992 likes this.

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