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Comparison of finite-volume and spectral/hp methods for large-eddy simulation of combustor port flow

journal contribution
posted on 03.08.2022, 07:50 authored by Vishal Saini, Hao XiaHao Xia, Gary PageGary Page

High-order accurate methods provide significant accuracy/cost benefits for well-resolved and geometrically simple scale-resolving turbulent flow simulations. However, the benefit on under-resolved unstructured grids for complex industrial geometries is unclear. The purpose of this work is to contribute to understanding of the benefit of high-order schemes for large-eddy simulations (LES) in practical applications. A crucial requirement is a high-order solver that supports hybrid unstructured grids. In this context, accuracy and cost of a high-order spectral/hphp Nektar++ solver and a standard second-order finite-volume OpenFoam solver are systematically compared for performing LES (with subgrid scale treatments) on two configurations. The first configuration is Taylor–Green vortex, which shows that the accuracy benefit of fifth-order LES depends upon the mesh type and the level of under-resolution. The second configuration is geometrically more complex and represents the dilution port flows of gas turbine combustors. Specifically, the flow consists of crossflow radial jets impinging onto each other, providing a rich variety of features and thus making the case challenging. It is found that, for a given cost, fifth-order LES reproduces the unsteady flow features significantly better and offers moderate improvements in the mean quantities. Moreover, results from a finer 5×5× more costly OpenFoam simulation suggest that, for a similar accuracy, fifth-order LES could be 3-8×3-8× cheaper. 

Funding

EPSRC Centre for Doctoral Training in Gas Turbine Aerodynamics

Engineering and Physical Sciences Research Council

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Proposal for a Tier 2 Centre - HPC Midlands Plus

Engineering and Physical Sciences Research Council

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History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

AIAA Journal

Volume

60

Issue

7

Pages

4367 - 4383

Publisher

American Institute of Aeronautics and Astronautics

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This paper was accepted for publication in the AIAA Journal and the definitive published version is available at https://doi.org/10.2514/1.J060961. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the eISSN 1533-385X to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp.

Acceptance date

28/02/2022

Publication date

2022-04-10

Copyright date

2022

ISSN

0001-1452

eISSN

1533-385X

Language

en

Depositor

Prof Gary Page. Deposit date: 21 July 2022