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Adams bashforth vs Euler

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Old   June 25, 2013, 07:15
Default Adams bashforth vs Euler
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Hassan Nemati
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Dears
I am running a DNS code for variable properties. I am using Adams Bashforth 2order for both Momentum and Enthalpy. It crashes, but when I am using Forward_Euler for Enthlpy it works.
Could some one help me why it is happening?
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Old   June 30, 2013, 08:47
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Filippo Maria Denaro
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Quote:
Originally Posted by hnemati View Post
Dears
I am running a DNS code for variable properties. I am using Adams Bashforth 2order for both Momentum and Enthalpy. It crashes, but when I am using Forward_Euler for Enthlpy it works.
Could some one help me why it is happening?
Generally, the AB scheme is used for the convective term whilst the Crank-Nicolson is used for the diffusive term. Stability constraint is improved. Have you checked the correct CFL condition in terms of the sound velocity?
What about the density equation?
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