Problem understanding rhoPisoFoam

MatP · May 14, 2010, 11:30

Hey i'm a newbie in Openfoam and try to understand the solution scheme of the solver rhoPisoFoam.

On of the first equations to be solved is the continuity equation for density included by rhoEqn.H.

Now my question is what is solved by that equation and why i have to do so. Later on in pEqn.H the same headerfile is included once more. Why?

Maybe somebody can help me understanding this.

Thx Matthias

alberto · May 15, 2010, 13:21

The first time you find an updated density at the new time, based on the old flux (see the flux is not recomputed, but the conservative one at old time is used).

In the pEqn, you find the updated density at the new time using the conserved flux at the current time.

Best,

May 14, 2010, 11:30	Problem understanding rhoPisoFoam	#1
MatP New Member Matthias P Join Date: May 2010 Posts: 16 Rep Power: 15	Hey i'm a newbie in Openfoam and try to understand the solution scheme of the solver rhoPisoFoam. On of the first equations to be solved is the continuity equation for density included by rhoEqn.H. Now my question is what is solved by that equation and why i have to do so. Later on in pEqn.H the same headerfile is included once more. Why? Maybe somebody can help me understanding this. Thx Matthias

May 15, 2010, 13:21		#2
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	The first time you find an updated density at the new time, based on the old flux (see the flux is not recomputed, but the conservative one at old time is used). In the pEqn, you find the updated density at the new time using the conserved flux at the current time. Best, __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

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