Finite element analysis of laminar and turbulent flows using LES and subgrid-scale models
Numerical simulations of laminar and turbulent flows in a lid driven cavity and over a backward-facing step are presented in this work. 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 physic...
| Authors: | , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2006 |
| Country: | Brasil |
| Institution: | Universidade Federal do Rio Grande (FURG) |
| Repository: | Repositório Institucional da FURG (RI FURG) |
| Language: | English |
| OAI Identifier: | oai:repositorio.furg.br:1/5049 |
| Online Access: | http://repositorio.furg.br/handle/1/5049 |
| Access Level: | Open access |
| Keyword: | Laminar and turbulent flows Large eddy simulation Finite elements Subgrid-scale model |
| Summary: | Numerical simulations of laminar and turbulent flows in a lid driven cavity and over a backward-facing step are presented in this work. 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 heat transfer. The filtered Navier–Stokes equations are used to simulate large scales, however they are supplemented by subgrid-scale (SGS) models to simulate the energy transfer from large scales toward subgridscales, where this energy will be dissipated by molecular viscosity. Two SGS models are applied: the classical Smagorinsky s model and the Dynamic model for large eddy simulation (LES). Both models are implemented in a three-dimensional finite element code using linear tetrahedral elements. Qualitative and quantitative aspects of two and three-dimensional flows in a lid-driven cavity and over a backward-facing step, using LES, are analyzed comparing numerical and experimental results obtained by other authors. |
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