Inscrição na biblioteca: Guest
Seventh International Symposium on Turbulence and Shear Flow Phenomena
July, 28-31, 2011, Ottawa Convention Centre, Ottawa, Canada

DOI: 10.1615/TSFP7

ASSESSMENT OF LARGE-EDDY SIMULATION BASED ON RELAXATION FILTERING: APPLICATION TO THE TAYLOR-GREEN VORTEX

pages 1-6
DOI: 10.1615/TSFP7.2020
Get accessGet access

RESUMO

Results obtained for a Taylor-Green vortex at a Reynolds number of 3000, using Large-Eddy Simulation (LES) based on Relaxation Filtering (RF), are presented in order to assess the quality of the RF-LES methodology. The RF is applied every time step to the velocity components, using a standard filters of orders k ≥ 4 at a fixed strength σ , to relax subgrid energy from scales at wave numbers close to the grid cut-off wave number. Various combinations of k and σ are considered, for k ranging from 4 to 14 and σ from 0.15 to 1. Error landscapes are obtained by comparing the 643 LES results, filtered in post-processing to an effective resolution of four points per wavelength, to 3843 Direct Numerical Simulation data, filtered at identical resolution. For filters of order k ≤ 6, the LES accuracy is found to be rather poor and varies significantly with the filtering strength σ . However, for higher order filters, i.e. for k > 6, the accuracy is good and nearly independent of the strength σ .

Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa Políticas de preços e assinaturas Begell House Contato Language English 中文 Русский Português German French Spain