Divergence detected in AMG solver

bestniaz · May 26, 2015, 00:35

Dear Friends
I am trying to follow the tutorial as mentioned in the pdf ( http://www.me.metu.edu.tr/courses/me...20Cylinder.pdf )...but there are 2problems occure
My case study is " Unsteady flow over cylinder"
1. during mesh.. warning is " Edge(s) with local min size less than global min size has been defeatured. Please consider use different meshing parameters to preserve features if needed"

2nd error
when i applied the boundary condition i.e. inlet=80m/s, wall=shear stree=0, outlet=pressure 0, and cylinder no slip
when i try to solve it show error "Divergence detected in AMG solver"

the 2nd error is already discussed in forum, but i couldnt find the answer. and still have the same problem...need urgent help
Thanks to all friends in advance for consideration and time.
Best Regards
Niaz

bestniaz · May 26, 2015, 03:14

When I uncheck the "axissymmetric model" and use " 2D plannar" option...then the solution starts but the result is very different from the turtorial.....

May 26, 2015, 00:35	Divergence detected in AMG solver	#1
bestniaz Member N B Khan Join Date: Jan 2014 Posts: 39 Rep Power: 12	Dear Friends I am trying to follow the tutorial as mentioned in the pdf ( http://www.me.metu.edu.tr/courses/me...20Cylinder.pdf )...but there are 2problems occure My case study is " Unsteady flow over cylinder" 1. during mesh.. warning is " Edge(s) with local min size less than global min size has been defeatured. Please consider use different meshing parameters to preserve features if needed" 2nd error when i applied the boundary condition i.e. inlet=80m/s, wall=shear stree=0, outlet=pressure 0, and cylinder no slip when i try to solve it show error "Divergence detected in AMG solver" the 2nd error is already discussed in forum, but i couldnt find the answer. and still have the same problem...need urgent help Thanks to all friends in advance for consideration and time. Best Regards Niaz

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May 26, 2015, 03:14		#2
bestniaz Member N B Khan Join Date: Jan 2014 Posts: 39 Rep Power: 12	When I uncheck the "axissymmetric model" and use " 2D plannar" option...then the solution starts but the result is very different from the turtorial.....