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

Subgrid-scale Model
Large Eddy Simulation
Flow Simulation
Large eddy simulation
Complex Geometry
Turbulent Flow
Turbulent flow
Dynamic Model
Finite Element
Finite element method
Three-dimensional
Geometry
Three-step Methods
Francis turbines
Turbulent Channel Flow
Backward-facing Step
Complex Fluids
Convection-diffusion Problems
Direct numerical simulation
Energy Transfer

Cite this

Finite element analysis of turbulent flows using LES and dynamic subgrid-scale models in complex geometries. / Wang, Wenquan; Zhang, Lixiang; Yan, Yan; Guo, Yakun.

In: Mathematical Problems in Engineering, Vol. 2011, 712372, 2011.

Research output: Contribution to journalArticle

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