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A Fully Implicit Finite Volume Lattice Boltzmann Method for Turbulent Flows

Published online by Cambridge University Press:  21 June 2017

Fatih Çevik*
Affiliation:
Middle East Technical University, Mechanical Engineering Department, Çankaya, Ankara, Turkey Aselsan Inc., MGEO Division, Unmanned and Autonomous Systems Design Department, Akyurt Ankara, Turkey
Kahraman Albayrak*
Affiliation:
Middle East Technical University, Mechanical Engineering Department, Çankaya, Ankara, Turkey
*
*Corresponding author. Email addresses:cevik.fatih@outlook.com (F. Çevik), albayrak@metu.edu.tr (K. Albayrak)
*Corresponding author. Email addresses:cevik.fatih@outlook.com (F. Çevik), albayrak@metu.edu.tr (K. Albayrak)

Abstract

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Almost all schemes existed in the literature to solve the Lattice Boltzmann Equation like stream & collide, finite difference, finite element, finite volume schemes are explicit. However, it is known fact that implicit methods utilizes better stability and faster convergence compared to the explicit methods. In this paper, a method named herein as Implicit Finite Volume Lattice Boltzmann Method (IFVLBM) for incompressible laminar and turbulent flows is proposed and it is applied to some 2D benchmark test cases given in the literature. Alternating Direction Implicit, an approximate factorization method is used to solve the obtained algebraic system. The proposed method presents a very good agreement for all the validation cases with the literature data. The proposed method shows good stability characteristics, the CFL number is eased. IFVLBM has about 2 times faster convergence rate compared with Implicit-Explicit Runge Kutta method even though it possesses a computational burden from the solution of algebraic systems of equations.

Information

Type
Research Article
Copyright
Copyright © Global-Science Press 2017