Issue in simulation of open channel flow with high viscosity fluid

soleymm1 · July 20, 2015, 13:42

Hi ,

I am trying to simulate the flow of a high viscous fluid (about 1-10 Pa-s) in an open channel. I made the model and ran it for the case of water at first and the software was able to converge the simulation easily. However, by increasing the dynamic viscosity to the real value for my fluid which is about 1-10 Pa-s, it can not converge the model for some reason. Anyone had this problem before ? I really need to know what I can do for high viscous fluid simulation in open channels. Thanks a lot

Jefferson2010 · December 2, 2017, 10:41

I think this is because you are using an explicit scheme for time advancement.
You can try to use an implicit time scheme.

me3840 · December 3, 2017, 02:44

You have to give more information. How do you know it's not converging?

July 20, 2015, 13:42	Issue in simulation of open channel flow with high viscosity fluid	#1
soleymm1 New Member Mohammadreza Join Date: Jul 2015 Posts: 1 Rep Power: 0	Hi , I am trying to simulate the flow of a high viscous fluid (about 1-10 Pa-s) in an open channel. I made the model and ran it for the case of water at first and the software was able to converge the simulation easily. However, by increasing the dynamic viscosity to the real value for my fluid which is about 1-10 Pa-s, it can not converge the model for some reason. Anyone had this problem before ? I really need to know what I can do for high viscous fluid simulation in open channels. Thanks a lot

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December 2, 2017, 10:41		#2
Jefferson2010 New Member Join Date: Jan 2017 Posts: 4 Rep Power: 9	I think this is because you are using an explicit scheme for time advancement. You can try to use an implicit time scheme.

December 3, 2017, 02:44		#3
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 25	You have to give more information. How do you know it's not converging?