Investigation of near continuum flowfield past a sphere at hypervelocity using Navier Stokes equations. | [Proceedings 6th International Bhurban Conference on Applied Sciences and Technology • 2009]

Author(s):

1. Shahid Ahmad: Centres of Excellence in Science and Applied Technologies (CESAT), Islamabad, Pakistan

2. Sajid Raza Chaudhary: Centres of Excellence in Science and Applied Technologies (CESAT), Islamabad, Pakistan

3. Shahid Ahmad: Faculty of Mechanical Engineering, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, Pakistan

4. Javed Ahmed Chattha: Faculty of Mechanical Engineering, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, Pakistan

Abstract:

A numerical study of hypersonic rarefied flow past a sphere at Mach number 12.92 has been carried out using Navier Stokes equations based calculations under test conditions representing near-continuum flow regime. Validity of continuum flow model for Knudsen number, Kn of 0.009 has been investigated by comparing results of present numerical study with low density wind tunnel[1] test results and with DSMC[2] calculations. Moreover, present numerical study reveals that flow recirculation or steady vortex does not exist in the near wake for near-continuum flow regime of Kn = 0.009. This agrees to DSMC[2] predictions and provides a reasonable correction to previous prediction of presence of a steady vortex made by Navier Stokes calculations[3] under similar test conditions.

Page(s): 350-363

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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