Adams bashforth vs Euler

hnemati · June 25, 2013, 06:15

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

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?

June 25, 2013, 06:15	Adams bashforth vs Euler	#1
hnemati Member SAM Join Date: Apr 2012 Posts: 74 Rep Power: 14	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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