We discuss multinumerics and multiphysics coupling of multiphase flow models under IPARS (Integrated Parallel Accurate Reservoir Simulator) framework. The framework allows a researcher to focus on a particular flow model or numerical algorithm while it provides solutions to implementation issues like memory management, solvers, input/output and portability between platforms. Additionally, it accounts for structural discontinuities and allows for irregular geometry regions and domain decomposition with matching or nonmatching grids.

The novel approach which we present here is one of multiphysics and multinumerics in which different numerical and physical models are coupled across interface. The coupled codes simulate the flow and transport in a porous reservoir which can be decomposed into several parts, based on the number and type of fluid phases and components which flow there. The interface coupling comprises a set of matching or approximately matching conservation equations and constitutive laws. In particular, we discuss the coupling of a black-oil model with a two-phase model and a single-phase model. Our approach allows for efficient use of computational resources in a heterogeneous computing environment while it does not compromise the accuracy of the computations.

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1999-2000 Reactive Flow and Transport Phenomena