h‐adaptive finite element solution of high Rayleigh number thermally driven cavity problem

Mayne, David, Usmani, Asif and Crapper, Martin (2000) h‐adaptive finite element solution of high Rayleigh number thermally driven cavity problem. International Journal of Numerical Methods for Heat & Fluid Flow, 10 (6). pp. 598-615. ISSN 0961-5539

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Abstract

An h‐adaptive finite element code for solving coupled Navier‐Stokes and energy equations is used to solve the thermally driven cavity problem. The buoyancy forces are represented using the Boussinesq approximation. The problem is characterised by very thin boundary layers at high values of Rayleigh number (>106). However, steady state solutions are achievable with adequate discretisation. This is where the auto‐adaptive finite element method provides a powerful means of achieving optimal solutions without having to pre‐define a mesh, which may be either inadequate or too expensive. Steady state and transient results are given for six different Rayleigh numbers in the range 103 to 108 for a Prandtl number of 0.71. The use of h‐adaptivity, based on a posteriori error estimation, is found to ensure a very accurate problem solution at a reasonable computational cost.

Item Type:	Article
Uncontrolled Keywords:	Finite element method, Flow, Temperature
Subjects:	H200 Civil Engineering
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Becky Skoyles
Date Deposited:	08 Jun 2016 09:48
Last Modified:	12 Oct 2019 22:52
URI:	http://nrl.northumbria.ac.uk/id/eprint/27060

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