Investigation of flow and Acoustic analysis over a Generic Mirror. | [Proceedings 6th International Bhurban Conference on Applied Sciences and Technology • 2009]

Author(s):

1. Imran Afgan: Institute of Avionics and Astronautics, Air University, E-9, Islamabad, Pakistan

2. Kursad M. Guleren: Cumhuriyet University, Mechanical Engineering Department, Sivas, Turkey

3. Rizwan Riaz: College of Aeronautical Engineering, National University of Sciences and Technology, Risalpur, Pakistan

4. Dominique Laurence: The University of Manchester, Mechanical Aerospace and Civil Engineering Department, Manchester, United Kingdom

Abstract:

The flow around a generic side mirror of a car is numerically investigated via Large Eddy Simulation (LES) incorporating polyhedral meshes. The flow Reynolds number (Re) based on cylinder diameter and free stream velocity is 3.2 x 105 and the aspect ratio (AR) defined as height to radius of the cylinder is 3. The current study has three main objectives; to show the advantage of the use of polyhedral mesh in modeling such a complex geometry, to understand the flow physics and to predict the fluctuating pressure spectra for noise prediction. LES has been chosen because of its suitability for bluff body flows with small effects of boundary layers. An unstructured (polyhedral) mesh is easier, more flexible and far less time consuming to generate than a fully conforming structured mesh for such a complex geometry. It is seen that central differencing scheme holds better kinetic energy conservation properties on polyhedral cells than on non-conforming tetrahedral cells. Three different grids were tested with local prismatic layer refinements near solid walls. The flow was found to be subjected to strong three dimensional effects with an upstream laminar separation. The stagnation point was found to be located at zero degrees for both the cylinder and the sphere.

Page(s): 304-314

DOI: DOI not available

Published: Journal: Proceedings 6th International Bhurban Conference on Applied Sciences and Technology , Volume: 1, Issue: 0, Year: 2009

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