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CFL limits in AcuSolve

Junta_20361

Hello expert,

I'm doing a transient simulation: filling tank.

My tank is very big and the estimated filling process should take 7 hours to complete.

How should i choose the time step for my transient analysis?
7 hours = 25200s.
If i take the time step is 30 sec. the largest CFL number is 30000 >> i think this is not acceptable.
So may i know what is the limits of CFL number in AcuSolve?
I'm using Spalart - Allmaras turbulence model.

I couldn't find any document about this limits. and AcuSolve brochure even saying that it doens't depend on CFL.
But there should be some limit, right?

Thanks!

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v2020.2

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Ravi Teja Chaganti

Hi,

Usually you can go up to a CFL number of 10. Given that, looks like 7hrs is too long to simulate. Can I know what the objective of this simulation is?

Thanks,

Ravi

Junta_20361

Hi,

Usually you can go up to a CFL number of 10. Given that, looks like 7hrs is too long to simulate. Can I know what the objective of this simulation is?

Thanks,

Ravi

hi Ravi,

Thanks for your response.

I want to simulate our filling process.

The inlet gas is H2 while the initial tank is filled with air.

I need to check after filling for 7 hours, how much oxygen is remained inside the tank.

If there is much oxygen inside the tank, it is dangerous because of explosion.