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no convergence for cylinder under external pressure
Posted Feb 7, 2014, 9:25 a.m. EST Computational Fluid Dynamics (CFD), Structural Mechanics Version 4.4 1 Reply
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I have a 2D model of a cylinder tube.
External pressure acts on the outer wall of the cylinder, a different pressure on the inner wall.
The analysis does not converge:
I get an error message:
"Failed to find a solution for the initial parameter./Maximum number of Newton iterations reached./There was an error message from the linear solver./The relative error (3.9e+002) is greater than the relative tolerance./Returned solution is not converged./ - Feature: Stationary Solver 1 (sol1/s1)"
What is missing, to make it converge?
I include a model file.
I got the same problem with a 3D modeling of a cylinder tube, if I put the base on a "Roller" foundation, while it does converge, if I use "fixed constraint".
External pressure acts on the outer wall of the cylinder, a different pressure on the inner wall.
The analysis does not converge:
I get an error message:
"Failed to find a solution for the initial parameter./Maximum number of Newton iterations reached./There was an error message from the linear solver./The relative error (3.9e+002) is greater than the relative tolerance./Returned solution is not converged./ - Feature: Stationary Solver 1 (sol1/s1)"
What is missing, to make it converge?
I include a model file.
I got the same problem with a 3D modeling of a cylinder tube, if I put the base on a "Roller" foundation, while it does converge, if I use "fixed constraint".
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1 Reply Last Post Feb 12, 2014, 5:05 a.m. EST
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Posted:
1 decade ago
With increasing experience I found the solution for 2-D myself: I need to insert a "fixed constraint" at two "points" or a "roller" on one surface segment.