# Urgent help

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 October 18, 2004, 21:52 Urgent help #1 ahourri Guest   Posts: n/a Does fluent has limits in its computation? Can't get convergence and mass balance with hydrogen flow (mass flow rate 7e-5 kg/s and velocity 0.022 m/s)in transient mode. My model works with 100 times the same mass flow rate. Any idea will be greatly appreciated

 October 19, 2004, 02:47 Re: Urgent help #2 SAM Guest   Posts: n/a describe u physicl model

 October 19, 2004, 04:27 Re: Urgent help #3 dumb Guest   Posts: n/a use double precision if u think it is a prob of ur value too low.

 October 19, 2004, 08:00 Re: Urgent help #4 SAM Guest   Posts: n/a mass is extensve property. unlike the termprature and pressure please coudl u describe ur problem.i.e physical model, boundary conditions, any assumption. like symetry or periodic regards

 October 19, 2004, 10:33 Re: Urgent help #5 Satyam Guest   Posts: n/a Use double precision solver

 October 19, 2004, 14:30 Re: Urgent help #6 ahourri Guest   Posts: n/a My set up is a rectangular configuration with walls everywhere and three windows. One window in the ground is set as mass flow rate, one in the ceiling is a pressure outlet and another one in the front wall as pressure inlet. I am modeling a very simple gas dispersion problem. I am using parallel computers network.

 October 19, 2004, 20:11 Re: Urgent help #7 dumb Guest   Posts: n/a mass flow inlet and pressure inlet and one pressure outlet, ... together they seems to be creating problem ... u might want to consider another combination ..or try increasing number of iterations per time step (they should be quite large to get these together workign well) ...

 October 20, 2004, 21:04 Re: Urgent help #8 ahourri Guest   Posts: n/a I changed the mass flow rate to pressure inlet which gives 7.1e-5 Pa at the pressure inlet (5.3e-7 Torr). I don't know if the NS equations still hold at that low pressure.

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