Please use this identifier to cite or link to this item: https://doi.org/10.1002/fld.226
Title: Efficient computation of natural convection in a concentric annulus between an outer square cylinder and an inner circular cylinder
Authors: Shu, C. 
Zhu, Y.D. 
Keywords: Concentric annulus
Differential quadrature method
Natural convection
Issue Date: 20-Feb-2002
Citation: Shu, C., Zhu, Y.D. (2002-02-20). Efficient computation of natural convection in a concentric annulus between an outer square cylinder and an inner circular cylinder. International Journal for Numerical Methods in Fluids 38 (5) : 429-445. ScholarBank@NUS Repository. https://doi.org/10.1002/fld.226
Abstract: In this work, the natural convection in a concentric annulus between a cold outer square cylinder and a heated inner circular cylinder is simulated using the differential quadrature (DQ) method. The vorticity-stream function formulation is used as the governing equation, and the coordinate transformation technique is introduced in the DQ computation. It is shown in this paper that the outer square boundary can be approximated by a super elliptic function. As a result, the coordinate transformation from the physical domain to the computational domain is set up by an analytical expression, and all the geometrical parameters can be computed exactly. Numerical results for Rayleigh numbers range from 104 to 106 and aspect ratios between 1.67 and 5.0 are presented, which are in a good agreement with available data in the literature. It is found that both the aspect ratio and the Rayleigh number are critical to the patterns of flow and thermal fields. The present study suggests that a critical aspect ratio may exist at high Rayleigh number to distinguish the flow and thermal patterns. Copyright © 2002 John Wiley and Sons, Ltd.
Source Title: International Journal for Numerical Methods in Fluids
URI: http://scholarbank.nus.edu.sg/handle/10635/85090
ISSN: 02712091
DOI: 10.1002/fld.226
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