IJERT-EMS
IJERT-EMS

Numerical Comparison of RANS and LES Turbulence Model for Wind Flow Over a Cube in a Turbulent Channel using OPENFOAM


Numerical Comparison of RANS and LES Turbulence Model for Wind Flow Over a Cube in a Turbulent Channel using OPENFOAM
Authors : Bibhab Kumar Lodh, Ajoy Kumar Das, Navtej Singh
Publication Date: 23-02-2017

Authors

Author(s):  Bibhab Kumar Lodh, Ajoy Kumar Das, Navtej Singh

Published in:   International Journal of Engineering Research & Technology

License:  This work is licensed under a Creative Commons Attribution 4.0 International License.

Website: www.ijert.org

Volume/Issue:   Volume. 6 - Issue. 01 , February - 2017

e-ISSN:   2278-0181

 DOI:  http://dx.doi.org/10.17577/IJERTV6IS020303

Abstract

This paper deals with the turbulent flow over a cube placed in a turbulent channel. Two turbulence model i.e, Reynolds Average Navier Stokes Equation (RANS) and Large Eddy Simulation (LES) are used to compare the results of the various parameters. In case of RANS a 2D model is used and k- ε two equation unsteady state is used to model the flow field whereas in LES 3D model is incorporated and smagorinsky one equation unsteady model is used to find the flow field parameters. The flow domain for RANS 2d case is 60 cm × 30 cm and the 2d cube model (4 cm × 4 cm) is placed at a distance of 20 cm from the entrance at the base of the domain where as for LES 3D case the domain is of the size of 60 cm × 30 cm × 30 cm and the 3D cube model (4cm × 4 cm × 4 cm) is placed at a distance of 20 cm from the entrance at the ground in the centre of the base of the domain. The Reynolds number for the flow in respect of the height of the cube i.e, 4 cm is 65000. For meshing the flow field hexahedral grids were used. Various flow parameters i.e., velocity profile around the cube and flow field, pressure coefficient over the cube, kinetic energy and shear stress, energy spectrum, Drag & lift coefficients, vorticity magnitudes and y+ are being compared with respect to the two incorporated turbulence model. OpenFoam under the Linux Ubuntu is being used for the computational and numerical analysis. PISO algorithm is being employed for LES where as PIMPLE algorithm is used for RANS model.

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