000014484 001__ 14484
000014484 005__ 20161115100153.0
000014484 04107 $$aeng
000014484 046__ $$k2016-08-21
000014484 100__ $$aSherwin, Spencer
000014484 24500 $$aOn the Riemann flux performance in DG-based implicit LES at very high Reynolds numbers

000014484 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014484 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014484 506__ $$arestricted
000014484 520__ $$2eng$$aWe discuss the effect of the Riemann flux in implicit large eddy simulations carried out with the discontinuous Galerkin (DG) method at very high Reynolds numbers. The study is based on a set of computations of the inviscid TGV (Taylor-Green vortex) test problem spanning different grid sizes and polynomial orders. Inviscid cases have been chosen so that the isolated effects of the Riemann solver could be assessed in a scenario that mimics that of under-resolved computations at very high Reynolds numbers. Comparisons are made mainly between the Lax-Friedrichs and Roe solvers and significant differences are found, especially for higher-order solutions. An explanation based on dispersion-diffusion (eigensolution) analysis [1] is proposed as to why Riemann solvers that take into account the complete set of physical eigenvalues consistently via upwinding are expected to display a more accurate and robust behaviour for DG-based implicit LES over a wider range of Mach numbers.

000014484 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014484 653__ $$a

000014484 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014484 720__ $$aSherwin, Spencer
000014484 8560_ $$ffischerc@itam.cas.cz
000014484 8564_ $$s201211$$uhttps://invenio.itam.cas.cz/record/14484/files/TS.FM04-2.02.pdf$$yOriginal version of the author's contribution as presented on CD,  page 661, code TS.FM04-2.02
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000014484 962__ $$r13812
000014484 980__ $$aPAPER