Fluent Residual Problem

lehoanganh07 · December 9, 2013, 07:01

Hi everyone,

I am running my simulation in 3-D Nozzle.
I choose K-Omega Low Reynold Turbulence model for turbulence
Solution method: SIMPLE, transient time
Gradient: Green Gauss Cell base
Pressure: Linear
Momentum: Second order Upwind(TVD Scheme)
Kinetic Turbulent omega equation:First order upwind
anll relaxasion value set to 0.8 (referent from book Introduction Finit volume method)
But the continuity residua will grow up to 1e+04, and after 100 step the error appare: AMU error.
Could you give me sugesion about this problem

shahid nadeem · December 9, 2013, 07:57

This error may occur due to bigger mesh sizes try to give smaller mesh size and also check the value of pressure at the reference value section give it as .9 or .8 and try

lehoanganh07 · December 9, 2013, 10:29

Thank you for your suggestion, shahid
What do you mean about: pressure referent to .9 or .8
Actually, the big grid size may be one of the reason because Fluent shown the warning about hight ratio in the grid

shahid nadeem · December 10, 2013, 00:30

sorry not the pressure the momentum value which we get in the solution controls in fluent. I Dont know exactly what it is but once i got the same error of AMU and when i checked the solution control the momentum value was zero due to which i was getting the error.

Thank You

shahid nadeem · December 10, 2013, 00:43

hey leho do you have any idea about the error : Geometry would result in an non-manifold bodies

December 9, 2013, 07:01	Fluent Residual Problem	#1
lehoanganh07 Member le hoang anh Join Date: Oct 2012 Posts: 96 Rep Power: 13	Hi everyone, I am running my simulation in 3-D Nozzle. I choose K-Omega Low Reynold Turbulence model for turbulence Solution method: SIMPLE, transient time Gradient: Green Gauss Cell base Pressure: Linear Momentum: Second order Upwind(TVD Scheme) Kinetic Turbulent omega equation:First order upwind anll relaxasion value set to 0.8 (referent from book Introduction Finit volume method) But the continuity residua will grow up to 1e+04, and after 100 step the error appare: AMU error. Could you give me sugesion about this problem

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December 9, 2013, 07:57		#2
shahid nadeem Member Nazim Join Date: Oct 2013 Posts: 93 Rep Power: 12	This error may occur due to bigger mesh sizes try to give smaller mesh size and also check the value of pressure at the reference value section give it as .9 or .8 and try

December 9, 2013, 10:29		#3
lehoanganh07 Member le hoang anh Join Date: Oct 2012 Posts: 96 Rep Power: 13	Thank you for your suggestion, shahid What do you mean about: pressure referent to .9 or .8 Actually, the big grid size may be one of the reason because Fluent shown the warning about hight ratio in the grid

December 10, 2013, 00:30		#4
shahid nadeem Member Nazim Join Date: Oct 2013 Posts: 93 Rep Power: 12	sorry not the pressure the momentum value which we get in the solution controls in fluent. I Dont know exactly what it is but once i got the same error of AMU and when i checked the solution control the momentum value was zero due to which i was getting the error. Thank You

December 10, 2013, 00:43		#5
shahid nadeem Member Nazim Join Date: Oct 2013 Posts: 93 Rep Power: 12	hey leho do you have any idea about the error : Geometry would result in an non-manifold bodies