Imperial College London

ProfessorSpencerSherwin

Faculty of EngineeringDepartment of Aeronautics

Professor of Computational Fluid Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 5052s.sherwin Website

 
 
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Location

 

313BCity and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Moura:2017:10.1007/978-3-319-65870-4_10,
author = {Moura, RC and Mengaldo, G and Peiró, J and Sherwin, SJ},
doi = {10.1007/978-3-319-65870-4_10},
pages = {161--173},
title = {An LES Setting for DG-Based Implicit LES with Insights on Dissipation and Robustness},
url = {http://dx.doi.org/10.1007/978-3-319-65870-4_10},
year = {2017}
}

RIS format (EndNote, RefMan)

TY  - CPAPER
AB - © 2017, Springer International Publishing AG. We suggest a new interpretation of implicit large eddy simulation (iLES) approaches based on discontinuous Galerkin (DG) methods by analogy with the LES-PLB framework (Pope, Fluid mechanics and the environment: dynamical approaches. Springer, Berlin, 2001), where PLB stands for ‘projection onto local basis functions’. Within this framework, the DG discretization of the unfiltered compressible Navier-Stokes equations can be recognized as a Galerkin solution of a PLB-based (and hence filtered) version of the equations with extra terms originating from DG’s implicit subgrid-scale modelling. It is shown that for under-resolved simulations of isotropic turbulence at very high Reynolds numbers, energy dissipation is primarily determined by the property-jump term of the Riemann flux employed. Additionally, in order to assess how this dissipation is distributed in Fourier space, we compare energy spectra obtained from inviscid simulations of the Taylor-Green vortex with different Riemann solvers and polynomial orders. An explanation is proposed for the spectral ‘energy bump’ observed when the Lax-Friedrichs flux is employed.
AU - Moura,RC
AU - Mengaldo,G
AU - Peiró,J
AU - Sherwin,SJ
DO - 10.1007/978-3-319-65870-4_10
EP - 173
PY - 2017///
SN - 1439-7358
SP - 161
TI - An LES Setting for DG-Based Implicit LES with Insights on Dissipation and Robustness
UR - http://dx.doi.org/10.1007/978-3-319-65870-4_10
ER -