# absolute pressure limit

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 October 24, 2007, 06:59 absolute pressure limit #1 Jianfeng Zou Guest   Posts: n/a Dear everyone. I run a 3D case with fluent. After 100+ iterations, the solver present 'absolute pressure limited to 1.0 in xx cells on zone xx'. Ideal gas was used. How should I do? Should I refine my grid system. If the computation continues, a resonable solution will be achieved finally?

 October 24, 2007, 12:13 Re: absolute pressure limit #2 AJK Guest   Posts: n/a let the simulation run for a while and this error may go away or else you need to make ur mesh fine in that particular area or use grid adaption technique

 October 24, 2007, 19:13 Re: absolute pressure limit #3 Venkatesh V Guest   Posts: n/a If you are running transient problem reduce the time step. If you are running steady state reduce the under relaxation factors. I think currently your Min absolute pressure 1. I would suggest you set that to reasonable valve. I would suggest you to set resonable limits for all the values. Thanks Venkatesh V

 October 24, 2007, 21:02 Re: absolute pressure limit #4 Jianfeng Zou Guest   Posts: n/a Dear AJK and Venkatcsh V, I am simulating a turbulence diffusion hydrogen flame(the incoming air is supersonic and the fuel is sonic). I found the low pressure (about the pressure limit 1.0 Pa) locate mainly in the near region around the hydrogen jet. Besides mesh finement, using small time step size, etc, what else should I do to the boundary condition or initial condition? Bye the way, after 100+ iterations with pressure limit warning, my calculation seem to be steady, anyway.

 October 25, 2007, 02:56 Re: absolute pressure limit #5 goldenland Guest   Posts: n/a When I simulate the supersonic gas flow in the nozzle, I met the same problem. In this case, I change the limitation value of the absolute pressure(solve->control->limits...->absolute pressure) to a very small value. In my case, the problem is solved. So you can try yours. Good luck.

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