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High pressure tank discharge

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Old   March 5, 2015, 16:05
Default High pressure tank discharge
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Dear all,

I'm modelling the discharge of a high pressure tank to the atmosphere. The tank is very long, has 5mm diamater and is suddenly opened to atmosphere. I've already made some tests with an experimental unit at 70 bar and now I'm modelling it in Fuent ussing an axisymmetric model, with density based solver.

I'm having lots of trouble with the timestep as the solution blows up for timestep sizes bigger than 1e-6s. With this timestep, the simulation takes too long.

Does anybody has any idea on how to increase timestep size?
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Old   March 23, 2021, 02:19
Default Did you find the answer?
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If you found the answer please update it on the feed.
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Old   March 23, 2021, 05:27
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I think the time step is calculated using CFL condition . with 70 bar, the flow has a very high velocity and you are not able to increase timestep size
and why you modelling the full discharge????
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compressible flow, discharge, timestep size, transient flow

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