multiRegionFoam -- A Unified Multiphysics Framework for Multi-Region Coupled Continuum-Physical Problems

This paper presents a unified framework, called multiRegionFoam, for solving multiphysics problems of the multi-region coupling type within OpenFOAM (FOAM-extend). It is intended to supersede the existing solver with the same name. The design of the new framework is modular, allowing users to assemb...

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Bibliographic Details
Published in:arXiv.org 2023-07
Main Authors: Alkafri, Heba, Habes, Constantin, Fadeli, Mohammed Elwardi, Hess, Steffen, Beale, Steven B, Zhang, Shidong, Jasak, Hrvoje, Marschall, Holger
Format: Article
Language:English
Subjects:
Boundary conditions
Coupling
Mathematical analysis
Modular structures
Multiphase flow
Tensors
Transport equations
Online Access:Get full text
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Summary:This paper presents a unified framework, called multiRegionFoam, for solving multiphysics problems of the multi-region coupling type within OpenFOAM (FOAM-extend). It is intended to supersede the existing solver with the same name. The design of the new framework is modular, allowing users to assemble a multiphysics problem region-by-region and coupling conditions interface-by-interface. The present approach allows users to choose between deploying either monolithic or partitioned interface coupling for each individual transport equation. The formulation of boundary conditions is generalised in the sense that their implementation is based on the mathematical jump/transmission conditions in the most general form for tensors of any rank. The present contribution focuses on the underlying mathematical model for these types of multiphysics problems, as well as on the software design and resulting code structure that enable a flexible and modular approach. Finally, deployment for different multi-region coupling cases is demonstrated, including conjugate heat, multiphase flows and fuel-cells.
ISSN:2331-8422