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Yongmann M. Chung
School of Engineering and Centre for Scientific Computing University of Warwick Coventry CV4 7AL, UK

Paul G. Tucker
Fluid Dynamics Research Centre, School of Engineering, The University of Warwick, Coventry; Whittle laboratory, University of Cambridge, UK


The turbulent flow and heat transfer inside an electronic system is computed with large-eddy simulation (LES) using three subgrid-scale models. The flow is highly oscillatory and flow separation takes place in several regions. Accurate prediction of the internal turbulent flow and thermal fields is important in the cooling of electronics. The one-equation linear subgrid-scale (SGS) model of Yoshizawa and the non-linear SGS model of Kosovic as well as the Smagorinsky model are used to calculate the residual stress tensor. The results are compared with Laser Doppler Anemometry (LDA) measurements along with Unsteady Reynolds Averaged Navier-Stokes (URANS) computations. The LES convincingly reproduces a highly oscillatory turbulent flow. Compared to URANS predictions, the LES results give better agreement with turbulence measurements. The oneequation subgrid-scale models produces better results than the Smagorinsky model in terms of heat transfer.