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hnemati June 25, 2013 06:15

Adams bashforth vs Euler
 
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?

FMDenaro June 30, 2013 07:47

Quote:

Originally Posted by hnemati (Post 435784)
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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