Direct Numerical Simulation of Rotating Cavity Flows Using a Spectral Element-Fourier Method

Pitz, DB, Chew, J, Marxen, O and Hills, NJ (2016) Direct Numerical Simulation of Rotating Cavity Flows Using a Spectral Element-Fourier Method Journal of Engineering for Gas Turbines and Power: Transactions of the ASME.

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Abstract

in a rotor/stator cavity without heat transfer and buoyant flow in a rotor/rotor cavity. The numerical tool used employs a spectral element discretisation in two dimensions and a Fourier expansion in the remaining direction, which is periodic and corresponds to the azimuthal coordinate in cylindrical coordinates. The spectral element approximation uses a Galerkin method to discretise the governing equations, but employs high-order polynomials within each element to obtain spectral accuracy. A second-order, semi-implicit, stiffly stable algorithm is used for the time discretisation. Numerical results obtained for the rotor/ stator cavity compare favourably with experimental results for Reynolds numbers up to Re1 = 106 in terms of velocities and Reynolds stresses. The buoyancy-driven flow is simulated using the Boussinesq approximation. Predictions are compared with previous computational and experimental results. Analysis of the present results shows close correspondence to natural convection in a gravitational field and consistency with experimentally observed flow structures in a water-filled rotating annulus. Predicted mean heat transfer levels are higher than the available measurements for an air-filled rotating annulus, but in agreement with correlations for natural convection under gravity.

Item Type:	Article
Subjects :	Mechanical Engineering
Divisions :	Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :	Name Email ORCID Pitz, DB Chew, J Marxen, O Hills, NJ
Date :	2016
Copyright Disclaimer :	Copyright © 2016 by ASME
Related URLs :	Publisher
Depositing User :	Symplectic Elements
Date Deposited :	28 Oct 2016 07:09
Last Modified :	31 Oct 2017 18:52
URI:	http://epubs.surrey.ac.uk/id/eprint/812647

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