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convergence unsteady state

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Old   March 24, 2012, 11:38
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andres
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Hi Banty,
look at this... 87 seconds and the tanks still full with air and pressurized... no way...

I started with time step 0.1 then 0.5... then 1 then 5... nothing... results are pretty much the same


Please see pictures of parameters, residuals and results...

I do appreciate your help!
Thank you
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Old   March 28, 2012, 13:31
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banty
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Hello,

something wrong with the solver setting or mesh or even in physical problem modeling because solution is not converging (residuals ~ 10^-1). Would u once check with very fine mesh.
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Old   March 29, 2012, 14:50
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andres
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mesh is ok because I have a 97% of element quality, low skewness, and fine aspect ratio.
A finest mesh will make me require a parallel process...
have you ever tried to solve a discharging process?

if you want to you can design a 52ft high and 12ft diameter. Discharge air from 150psi to a 42" line

Thank you Banty
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