A higher-order unsplit 2D direct Eulerian finite volume method for two-material compressible flows based on the MOOD paradigms

摘要

A higher-order unsplit multi-dimensional discretization of the diffuse interface model for two-material compressible flows proposed by R. Saurel, F. Petitpas and R. A. Berry in 2009 is developed. The proposed higher-order method is based on the concepts of the Multidimensional Optimal Order Detection (MOOD) method introduced in three recent papers for single-material flows. The first-order unsplit multi-dimensional Finite Volume discretization presented by SPB serves as foundation for the development of the higher-order unlimited schemes. Specific detection criteria along with a novel decrementing algorithm for the MOOD method are designed in order to deal with the complexity of multi-material flows. Numerically, we compare errors and computational times on several 1D problems (stringent shock tube and cavitation problems) computed on 2D meshes with the second- and fourth-order MOOD methods using a classical MUSCL method as reference. Several simulations of a 2D shocked R22 bubble in the air are also presented on Cartesian and unstructured meshes with the second- and fourth-order MOOD methods, and qualitative comparisons confirm the conclusions obtained with 1D problems. These numerical results demonstrate the robustness of the MOOD approach and the interest of using more than second-order methods even for locally singular solutions of complex physics models. Copyright (c) 2014 John Wiley & Sons, Ltd.