Open AccessTowards DES/DDES computation of the flow field and heat transfer adopting elliptic relaxation and local correlation based transition approaches
Author(s) -
Valerio D’Alessandro,
Luca Giammichele,
Camilla Lops,
R. A. Ricci
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1599/1/012042
Subject(s) - reynolds averaged navier–stokes equations , turbulence , large eddy simulation , context (archaeology) , computation , relaxation (psychology) , nusselt number , flow (mathematics) , physics , detached eddy simulation , mechanics , heat transfer , reynolds number , statistical physics , computer science , mathematics , geology , algorithm , psychology , paleontology , social psychology
As Large–Eddy Simulation (LES) shall remain too expensive in the following few decades for the ever increasing number of engineering complexities, researches have shifted much of the attention and effort to hybrid formulations incorporating Reynolds–Averaged Navier– Stokes (RANS) equations and LES in a certain ways. The long term goal of this research activity is to develop accurate hybrid RANS/LES methods. These approaches are particularly appealing in massively separated flows since they offer good prediction performance and they can be considered a good trade–off, in terms of computational resources, if compared with standard LES techniques. In particular with this work we want to deeply investigate Detached–Eddy Simulation (DES) based on: (i) elliptic relaxation turbulence model; (ii) Spalart Allmaras local correlation based transition model (LCTM). Specifically, we analyze v 2 –f DES approach for the convective heat transfer around a sphere at Re = 5000 (with Pr = 0.71) and we compare these results with the so called delayed version of the model. At the same time we also investigate the LCTM version of the SA model, in the DES context.