Mesh size refining for a simulation of flow around a generic train model

Ishak, I. A. and Mat Ali, Mohamed Sukri and Shaikh Salim, Sheikh Ahmad Zaki (2018) Mesh size refining for a simulation of flow around a generic train model. Wind and Structures, 24 (3). pp. 223-247. ISSN 1598-6225

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Abstract

By using numerical simulation, vast and detailed information and observation of the physics of flow over a train model can be obtained. However, the accuracy of the numerical results is questionable as it is affected by grid convergence error. This paper describes a systematic method of computational grid refinement for the Unsteady Reynolds Navier-Stokes (URANS) of flow around a generic model of trains using the OpenFOAM software. The sensitivity of the computed flow field on different mesh resolutions is investigated in this paper. This involves solutions on three different grid refinements, namely fine, medium, and coarse grids to investigate the effect of grid dependency. The level of grid independence is evaluated using a form of Richardson extrapolation and Grid Convergence Index (GCI). This is done by comparing the GCI results of various parameters between different levels of mesh resolutions. In this study, monotonic convergence criteria were achieved, indicating that the grid convergence error was progressively reduced. The fine grid resolution’s GCI value was less than 1%. The results from a simulation of the finest grid resolution, which includes pressure coefficient, drag coefficient and flow visualization, are presented and compared to previous available data.

Item Type: Article
Uncontrolled Keywords: Grid Convergence Index; generic train; CFD simulation; OpenFOAM; flow physics
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TJ Mechanical engineering and machinery > TJ210.2-211.47 Mechanical devices and figures. Automata. Ingenious mechanisms. Robots (General)
Divisions: Faculty of Engineering Technology > Department of Mechnical Engineering Technology
Depositing User: UiTM Student Praktikal
Date Deposited: 03 Jan 2022 04:41
Last Modified: 03 Jan 2022 04:41
URI: http://eprints.uthm.edu.my/id/eprint/4997

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