CFL limits in AcuSolve

Junta_20361
Junta_20361 New Altair Community Member
edited December 2020 in Community Q&A

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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Answers

  • Ravi Teja Chaganti
    Ravi Teja Chaganti New Altair Community Member
    edited December 2020

    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
    Junta_20361 New Altair Community Member
    edited December 2020
    Ravi Teja Chaganti said:

    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.

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