Experimental analysis of a confined transitional plume with respect to subgrid-scale modelling

R.J.M. Bastiaans, C.C.M. Rindt, A.A. Steenhoven, van

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Free convection flow of water induced by a small prismatic heat source in a confined space is studied in the present paper. The forcing of the flow is in the range of Rayleigh numbers where a spatial transition from laminar to turbulent flow can be observed. Velocity measurements were performed by means of Particle Tracking Velocimetry (PTV ) From the velocity data a resolved and a subgrid field is obtained by means of spatial filtering. These data are analysed with respect to modelling consequences in Large-Eddy Simulation (LES) , constituting an a priori test. A statistically steady flow has been obtained with a converged temporal mean and standard deviation as function of space. A low correlation of time mean model stresses with exact stresses is found. In the transitional region the inter-scale kinetic energy transfer, taken over a wavenumber corresponding to the laminar plume width, is found to possess a relative large standard deviation. In this region backscatter and forward scatter of kinetic energy, with respect to the mentioned wavenumber, are of equal importance. Application of a dynamic model to the filtered data yields a qualitative good representation of the exact inter-scale kinetic energy transfer.
Originele taal-2Engels
Pagina's (van-tot)3989-4007
Aantal pagina's41
TijdschriftInternational Journal of Heat and Mass Transfer
Nummer van het tijdschrift23
StatusGepubliceerd - 1998

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