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LES and RANS investigations into buoyancy-affected convection in a rotating cavity with a central axial throughflow

Sun, Zixiang, Lindblad, K, Chew, John and Young, C (2007) LES and RANS investigations into buoyancy-affected convection in a rotating cavity with a central axial throughflow Journal of Engineering for Gas Turbines and Power, 129 (2). pp. 318-325.

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Abstract

The buoyancy-affected flow in rotating disk cavities, such as occurs in compressor disk stacks, is known to be complex and difficult to predict. In the present work, large eddy simulation (LES) and unsteady Reynolds-averaged Navier-Stokes (RANS) solutions are compared to other workers’ measurements from an engine representative test rig. The Smagorinsky-Lilly model was employed in the LES simulations, and the RNG k- turbulence model was used in the RANS modeling. Three test cases were investigated in a range of Grashof number Gr=1.87 to 7.41 108 and buoyancy number Bo=1.65 to 11.5. Consistent with experimental observation, strong unsteadiness was clearly observed in the results of both models; however, the LES results exhibited a finer flow structure than the RANS solution. The LES model also achieved significantly better agreement with velocity and heat transfer measurements than the RANS model. Also, temperature contours obtained from the LES results have a finer structure than the tangential velocity contours. Based on the results obtained in this work, further application of LES to flows of industrial complexity is recommended.

Item Type: Article
Authors :
NameEmailORCID
Sun, ZixiangZixiang.Sun@surrey.ac.ukUNSPECIFIED
Lindblad, KUNSPECIFIEDUNSPECIFIED
Chew, JohnJ.Chew@surrey.ac.ukUNSPECIFIED
Young, CUNSPECIFIEDUNSPECIFIED
Date : 2007
Uncontrolled Keywords : LES, RANS, Buoyancy-Affected Convection, Rotating Cavity, Central Axial Throughflow
Depositing User : Symplectic Elements
Date Deposited : 20 Jul 2017 10:45
Last Modified : 20 Jul 2017 10:45
URI: http://epubs.surrey.ac.uk/id/eprint/804194

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