How is pEqn().flux() calculated?

kk415 · September 9, 2018, 01:54

For my better understanding of the PISO I want to understand how pEqn().flux() used for updating phi is calculated. I searched in many threads but didn't find something yet. Can anyone suggest a thread or explain the calculation.

Thanks in advance.

mAlletto · September 16, 2018, 07:29

You can find a description in

Description of flux() method

The basic idea behind the use of the pEqn.flux() function in the framework of the simple algorithm is to have a flux field consistent with the derivation of the pressure equation:

For the derivation of the pressure equation one assumes that the sum of the phase velocity fluxes vanishes (divergence free flow).

Once the pressure equation is solved, the phase fluxes are updated once to be consistent with the derivation of the pressure equation.

September 9, 2018, 01:54	How is pEqn().flux() calculated?	#1
kk415 Senior Member krishna kant Join Date: Feb 2016 Location: Hyderabad, India Posts: 133 Rep Power: 10	For my better understanding of the PISO I want to understand how pEqn().flux() used for updating phi is calculated. I searched in many threads but didn't find something yet. Can anyone suggest a thread or explain the calculation. Thanks in advance.

September 16, 2018, 07:29		#2
mAlletto Senior Member Michael Alletto Join Date: Jun 2018 Location: Bremen Posts: 615 Rep Power: 15	You can find a description in Description of flux() method The basic idea behind the use of the pEqn.flux() function in the framework of the simple algorithm is to have a flux field consistent with the derivation of the pressure equation: For the derivation of the pressure equation one assumes that the sum of the phase velocity fluxes vanishes (divergence free flow). Once the pressure equation is solved, the phase fluxes are updated once to be consistent with the derivation of the pressure equation. kk415 likes this.

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