Question about interFoam Solver

Kahnbein.Kai · August 25, 2019, 12:50

Hey Froum,
i got two general questions about interFoam Solver in OpenFOAM.

At the openFoamWiki about interFoam, i did not receive an answer to my question. Here is the Link: https://openfoamwiki.net/index.php/InterFoam

On the Wiki site is written, that (interFoam) is a solver.

Which method uses interFoam ? Out of a Book, there are three main groups of solvers.
Central methods
Lax-Wendorff method

Runge-Kutta mehtod

ADF method

Upwind mehtods
Flux-Vector-Splitting method

Flux-Difference-Splitting method

High-Resulution methods
Upwind TVD method

Central TVD method

Is it possible to name the method that uses interfoam ?

2. I use SimScale to simulate my cases, for multiphase simulations, they use interfoam. In the Numerics folde, i can choose another solvers (??) for U, modified pressure, modified pressure final and so on. The Solvers are Mules,GAMG, PCG, PBiCG and smooth Solver.
Why i have to choose these solvers, i think, i used interfoam ?
I dont understand the context between interfoam and these other slovers.

Greetz Kai

Santiago · August 25, 2019, 17:58

It seems to me that you are confusing linear solvers with numerical schemes. And even in the sub-categories you intermix different things. Don't know which kind of book you have!!

The method interfoam implements for the solution of multiphase flows is called Volume of Fluid (VoF), First proposed by Hirt somewhere in the 70's. Several flavors exist: the one interfoam has is called "MULES", a cousin of CICSAM.

Kahnbein.Kai · August 26, 2019, 16:36

Hello Santiago, thank you for your reply

. yes, i think i mixt up a few things. My Book is Numerische Strömungsberechnung from Stefan Lecher. As i understand from this page: https://www.openfoam.com/documentati.../fvSchemes.php Schemes have to defined, how to solve interpolations, gradient and divergence operations and so on, and the order of these operations. Standard is Gaussian finite volume integration. Is this right ? And the Preconditioner are to tranform a numerical problem in a more suitable way. The multi-phase solver is Mules, but for the other values, i have to choose other solvers. It depends i. e. of the matrix structure (symmertric or asymmertic). mh, i think im slowly understand it. Best regards Kai

August 25, 2019, 12:50	Question about interFoam Solver	#1
Kahnbein.Kai Member Join Date: Feb 2018 Posts: 58 Rep Power: 8	Hey Froum, i got two general questions about interFoam Solver in OpenFOAM. At the openFoamWiki about interFoam, i did not receive an answer to my question. Here is the Link: https://openfoamwiki.net/index.php/InterFoam On the Wiki site is written, that (interFoam) is a solver. Which method uses interFoam ? Out of a Book, there are three main groups of solvers. Central methods Lax-Wendorff method Runge-Kutta mehtod ADF method Upwind mehtods Flux-Vector-Splitting method Flux-Difference-Splitting method High-Resulution methods Upwind TVD method Central TVD method Is it possible to name the method that uses interfoam ? 2. I use SimScale to simulate my cases, for multiphase simulations, they use interfoam. In the Numerics folde, i can choose another solvers (??) for U, modified pressure, modified pressure final and so on. The Solvers are Mules,GAMG, PCG, PBiCG and smooth Solver. Why i have to choose these solvers, i think, i used interfoam ? I dont understand the context between interfoam and these other slovers. Greetz Kai

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August 25, 2019, 17:58		#2
Santiago Senior Member Santiago Lopez Castano Join Date: Nov 2012 Posts: 354 Rep Power: 15	It seems to me that you are confusing linear solvers with numerical schemes. And even in the sub-categories you intermix different things. Don't know which kind of book you have!! The method interfoam implements for the solution of multiphase flows is called Volume of Fluid (VoF), First proposed by Hirt somewhere in the 70's. Several flavors exist: the one interfoam has is called "MULES", a cousin of CICSAM.

August 26, 2019, 16:36		#3
Kahnbein.Kai Member Join Date: Feb 2018 Posts: 58 Rep Power: 8	Hello Santiago, thank you for your reply . yes, i think i mixt up a few things. My Book is Numerische Strömungsberechnung from Stefan Lecher. As i understand from this page: https://www.openfoam.com/documentati.../fvSchemes.php Schemes have to defined, how to solve interpolations, gradient and divergence operations and so on, and the order of these operations. Standard is Gaussian finite volume integration. Is this right ? And the Preconditioner are to tranform a numerical problem in a more suitable way. The multi-phase solver is Mules, but for the other values, i have to choose other solvers. It depends i. e. of the matrix structure (symmertric or asymmertic). mh, i think im slowly understand it. Best regards Kai