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The LS-STAG immersed boundary/cut-cell method for non-Newtonian flows in quasi-3D geometries

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URI: http://hdl.handle.net/2042/57111
Title: The LS-STAG immersed boundary/cut-cell method for non-Newtonian flows in quasi-3D geometries
Author: Nikfarjam, Farhad; Cheny, Yoann; Botella, Olivier
Abstract: The LS-STAG method is an immersed boundary/cut-cell method for viscous incompressible flows based on the staggered MAC arrangement for Cartesian grids, where the irregular boundary is sharply represented by its level-set function. The 2D version of the LS-STAG method is now well-established, and this talk presents its extension to 3D geometries with translational symmetry in the z direction (subsequently called quasi-3D configurations), which can be viewed as an intermediate step before fully 3D geometries, where both numerical and HPC implementation issues are tackled at this stage of development. The discretization in the 3 basic types of quasi-3D cut-cells is performed by following the principles of the energy-conserving discretization of Cheny & Botella (J. Comput. Phys. Vol. 229, 1043-1076, 2010). We will present applications on the flow of non-Newtonian fluids in a circular duct with sudden expansion, for which experimental results performed in our team are available. Finally, the performance of the LS-STAG code on high-performance parallel computers will be discussed.
Subject: non; incompressible flows; cell method; cut; immersed boundary method; computational fluid dynamics; newtonian fluids; 3D geometries; high performance computing
Publisher: AFM, Association Française de Mécanique
Date: 2015

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