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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Porous Media
Импакт фактор: 1.752 5-летний Импакт фактор: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN Печать: 1091-028X
ISSN Онлайн: 1934-0508

Выпуски:
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Journal of Porous Media

DOI: 10.1615/JPorMedia.v8.i1.20
pages 13-30

Numerical Solution of Turbulent Channel Flow Past a Backward-Facing Step with a Porous Insert Using Linear and Nonlinear k-ε Models

Marcelo Assato
Instituto de Aeronáutica e Espaço - IAE, Departamento de Ciência e Tecnologia Aeroespacial - DCTA, São José dos Campos – SP, 1228-904, Brazil
Marcos H. J. Pedras
Instituto de Pesquisa e Desenvolvimento—IP&D, Universidade do Vale do Paraiba—UNIVAP, 12244-000—Sao Jose dos Campos—SP, Brazil
Marcelo J.S. de Lemos
Instituto Tecnologico de Aeronautica - ITA 12228-900 - Sao Jose dos Campos - SP – Brazil
Head of Departamento de Energia (http://mec.ita.br/energia/)Head of Computational Transport Phenomena Laboratory (http://lcft.mec.ita.br/

Краткое описание

This work presents a numerical investigation of turbulent flow past a backward-facing-step channel with a porous insert using linear and nonlinear eddy viscosity macroscopic models. The nonlinear turbulence models are known to perform better than classical eddy-diffusivity models due to their ability to simulate important characteristics of the flow. Turbulence-driven secondary motion and the effects of streamline curvature on turbulence cannot be fully accounted for with simpler isotropic models. Parameters such as porosity, permeability, and thickness of the porous insert are varied in order to analyze their effects on the flow pattern, particularly on the damping of the recirculating bubble after the porous insertion. The numerical technique employed for discretizing the governing equations is the control-volume method. The SIMPLE algorithm is used to correct the pressure field. The classical wall function is utilized in order to handle flow calculation near the wall. Comparisons of results simulated with both linear and nonlinear turbulence models are shown.


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