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 October 27, 1998, 11:02 Re: Convergence problems - steady/unsteady #2 John C. Chien Guest   Posts: n/a (1). use " first order " to get solution to converge, then (2). continue on with " second and higher " scheme, (3). watch carefully the nature of the oscillation and especially the location of oscillation. (4). use under-relaxation factors to slow down the change between iterations. (5). refine your mesh in the area where you have oscillations. (6). Maybe the higher order schemes you use simply are less stable than the first order scheme. (6). oscillation is not a bad thing because most of the time, it is trying to tell something. So you can do something about it.

 October 28, 1998, 11:35 Re: Convergence problems - steady/unsteady #3 Jonathan Zerihan Guest   Posts: n/a Many thanks - I am a beginner in this field, but am learning quickly!!

 October 28, 1998, 11:51 Re: Convergence problems - steady/unsteady #4 John C. Chien Guest   Posts: n/a Learning is one simple way to keep your brain young and healthy. To keep ourself alive, we all have to keep learning. My answers to your question are simply suggestions only. ( There is no guarantee that it's the right answer. )

 October 30, 1998, 13:00 Re: Convergence problems - steady/unsteady #5 Andrew Chernousov Guest   Posts: n/a The poor convergence to steady state of higher-order schemes with limiters can be significantly improved, see ref.: Venkatakrishnan V. Convergence to steady state solutions of the Euler equations on unstructured grids with limiters. // J. Comput. Phys. 1995. v. 118. N 1. P. 120-130.

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