Finite element analysis of turbulent flows using LES and dynamic subgrid-scale models in complex geometries

Wenquan Wang, Lixiang Zhang, Yan Yan, Yakun Guo

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

An innovative computational model is presented for the large eddy simulation (LES) of multidimensional unsteady turbulent flow problems in complex geometries. The main objectives of this research are to know more about the structure of turbulent flows, to identify their three-dimensional characteristic, and to study physical effects due to complex fluid flow. The filtered Navier-Stokes equations are used to simulate large scales; however, they are supplemented by dynamic subgrid-scale (DSGS) models to simulate the energy transfer from large scales toward subgrid-scales, where this energy will be dissipated by molecular viscosity. Based on the Taylor-Galerkin schemes for the convection-diffusion problems, this model is implemented in a three-dimensional finite element code using a three-step finite element method (FEM). Turbulent channel flow and flow over a backward-facing step are considered as a benchmark for validating the methodology by comparing with the direct numerical simulation (DNS) results or experimental data. Also, qualitative and quantitative aspects of three-dimensional complex turbulent flow in a strong 3D blade passage of a Francis turbine are analyzed.
Original languageEnglish
Article number712372
Number of pages20
JournalMathematical Problems in Engineering
Volume2011
DOIs
Publication statusPublished - 2011

Fingerprint Dive into the research topics of 'Finite element analysis of turbulent flows using LES and dynamic subgrid-scale models in complex geometries'. Together they form a unique fingerprint.

  • Cite this