# A STRANGE PROBLEM!!!

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 March 19, 2003, 07:59 A STRANGE PROBLEM!!! #1 Fanadam Guest   Posts: n/a Hi, everybody! I'm facing a strange problem! If I set the initial velocity of the jet at the inlet is 600m/s, everything is OK. But if I change the value to 900m/s, the system will stop working and prompt me " Deivergence detected in AMG solver, X-momentum". I don't know how to solve it, and 900m/s is necessary. Who can help me? Thanks a million!!!

 March 19, 2003, 08:12 Re: A STRANGE PROBLEM!!! #2 kaiser Guest   Posts: n/a this problem is very common, ordinary, and traditional! lol!To solve it, change some parameters, even the solution control.

 March 19, 2003, 09:51 Re: A STRANGE PROBLEM!!! #3 mateus Guest   Posts: n/a You can also try to increase velocity in smaller steps untill you reach 900 m/s...

 March 19, 2003, 11:34 Re: A STRANGE PROBLEM!!! #4 Ming Guest   Posts: n/a You can decrease relaxation factor to a small value like 0.7 or even 0.5 in solution control.

 March 19, 2003, 20:11 Re: A STRANGE PROBLEM!!! #5 Fanadam Guest   Posts: n/a Hi, Kaiser, Ming and Mateus, thank you very much for your advice. I've changed the under relaxation factor, the discretization number of momentum and even the residuals, but nothing can make contribution. really, I can not image!!!

 March 20, 2003, 03:54 Re: A STRANGE PROBLEM!!! #6 kaiser Guest   Posts: n/a my final suggestion is to remodel ur problem, and provide more resonable grids.

 April 13, 2003, 14:58 Aerothermal example #8 Kaiser Guest   Posts: n/a Is there any good example of any aerothermal model. I need to solve a transient energy equation first. Then keep the result from the first run and then run the k-e turbulence model steady state and then do a transient thermal model again.

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