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Local Collocation Approach for Solving Turbulent Combined Forced and Natural Convection Problems

Published online by Cambridge University Press:  03 June 2015

Robert Vertnik  and
Božidar Šarler
Robert Vertnik*
Affiliation:
Technical Development, Štore-Steel d.o.o., Železarska 3, SI-3220, Štore, Slovenia
Božidar Šarler*
Affiliation:
Laboratory for Multiphase Processes, University of Nova Gorica, Vipavska 13, SI-5000, Nova Gorica, Slovenia
*
Corresponding author. URL: www.ung.si, Email: [email protected]
Email: [email protected]
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Abstract

An application of the meshless Local Radial Basis Function Collocation Method (LRBFCM) in solution of incompressible turbulent combined forced and natural convection is for the first time explored in the present paper. The turbulent flow equations are described by the low-Re number к – ε model with Launder and Sharma and Abe et al. closure coefficients. The involved temperature, velocity, pressure, turbulent kinetic energy and dissipation fields are represented on overlapping 5-noded sub-domains through the collocation by using multiquadrics Radial Basis Functions (RBF). The involved first and second order partial derivatives of the fields are calculated from the respective derivatives of the RBF’s. The involved equations are solved through the explicit time stepping. The pressure-velocity coupling is based on Chorin’s fractional step method. The adaptive upwinding technique, proposed by Lin and Atluri , is used because of the convection dominated situation. The solution procedure is represented for a 2D upward channel flow with differentially heated walls. The results have been assessed by achieving a reasonable agreement with the direct numerical simulation of Kasagi and Nishimura for Reynolds number 4494, based on the channel width, and Grash of number 9.6×105. The advantages of the represented mesh-free approach are its simplicity, accuracy, similar coding in 2D and 3D, and straightforward applicability in non-uniform node arrangements.

Keywords

76F6076M2576R0576R1065D0565M2265M70Turbulent combined convectiontwo-equation turbulence modelradial basis functioncollocationmeshless methodupward channel flow
Type
Research Article
Information
Advances in Applied Mathematics and Mechanics , Volume 3 , Issue 3 , June 2011 , pp. 259 - 279
Copyright
Copyright © Global-Science Press 2011

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