Industrial scale large eddy simulations (LES) with adaptive octree meshes using immersogeometric analysis

08/28/2020

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by   Kumar Saurabh, et al.

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We present a variant of the immersed boundary method integrated with octree meshes for highly efficient and accurate Large-Eddy Simulations (LES) of flows around complex geometries. We demonstrate the scalability of the proposed method up to 𝒪(32K) processors. This is achieved by (a) rapid in-out tests; (b) adaptive quadrature for an accurate evaluation of forces; (c) tensorized evaluation during matrix assembly. We showcase this method on two non-trivial applications: accurately computing the drag coefficient of a sphere across Reynolds numbers 1-10^6 encompassing the drag crisis regime; simulating flow features across a semi-truck for investigating the effect of platooning on efficiency.