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Heat transfer prediction from large eddy simulation of a rotating cavity with radial inflow

Onori, Michel, Amirante, Dario, Hills, Nicholas J. and Chew, John W. (2019) Heat transfer prediction from large eddy simulation of a rotating cavity with radial inflow In: Turbo Expo 2019: Turbomachinery Technical Conference & Exposition, 17-21 Jun 2019, Phoenix Convention Center, Phoenix, AZ, USA.

GT2019-90450.pdf - Accepted version Manuscript

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The paper describes a Large Eddy Simulation (LES) conducted for a non adiabatic rotating cavity with a radial inflow introduced from the shroud. The dimensionless mass flow rate of the radial inflow is Cw = 3500 and the rotational Reynolds number, based on the cavity outer radius, is equal to Req =1:2 x 106. The time averaged local Nusselt number on the heated wall is compared with the experimental data available from the literature, and with those derived from the solution of two Unsteady Reynolds Averaged Navier-Stokes (URANS) eddy viscosity models, namely the Spalart-Allmaras and the k-w SST model. It is shown that the Nusselt number is underpredicted in the lower part of the disc and over-predicted in the outer region by both URANS models, whereas the LES provides a much better agreement with the measurements. The behaviour results primarily from a different flow structure in the source region, which, in the LES, is found to be considerably more extended and show localized buoyancy phenomena that the URANS models investigated do not capture.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Hills, Nicholas
Chew, John
Date : 22 February 2019
Funders : Rolls-Royce plc
Copyright Disclaimer : Copyright 2019 by Rolls-Royce plc
Related URLs :
Depositing User : Diane Maxfield
Date Deposited : 06 Jun 2019 15:45
Last Modified : 06 Sep 2019 09:37

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