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Influence of the numerical schemes on the flow states of a simplified heavy vehicle

DOI: 10.1615/THMT-18.760
pages 731-734

A. Rao
Department of Mechanics and Maritime Sciences (M2), Chalmers University of Technology, Goteborg 41296, Sweden

J. Zhang
Department of Mechanics and Maritime Sciences (M2), Chalmers University of Technology, Goteborg 41296, Sweden

Guglielmo Minelli
Department of Mechanics and Maritime Sciences (M2), Chalmers University of Technology, Goteborg 41296, Sweden

Branislav Basara
AVL LIST GmbH, Advanced Simulation Technologies, Hans List Platz 1, 8020 Graz, Austria

Sinisa Krajnovic
Department of Mechanics and Maritime Sciences (M2), Chalmers University of Technology, Goteborg 41296, Sweden

要約

Recent experiments [1, 2] in the wake of a simplified heavy vehicle (also know as a ground transportation system (GTS)) have shown that the flow topology remains invariant over a large range of Reynolds numbers [3.8 × 104−2.8 × 106]. This allows numerical techniques such as large eddy simulations (LES) to accurately predict the flow topology at low Reynolds numbers, but are computationally expensive. Hybrid RANS/LES turbulence models are an alternative choice where, accurate prediction of the flow is possible on coarser grids ([3, 4]). Numerical simulations are performed using LES and a hybrid turbulence model - partially-averaged Navier−Stokes (PANS) equations at ReH = 3.8 × 104 for a unified tractor-trailer geometry to compare the flow topologies in the near wake. The influence of the numerical schemes on the flow topology in the symmetry plane which is susceptible to bi-stable flow is investigated using PANS, with the results from LES as a baseline for comparison.

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