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- W2187777122 abstract "Simulations of the three-dimensional turbulent ∞ow and heat transfer adjacent to a large (3 meter) high temperature (up to 860 K) vertical ∞at plate and in a large-scale methane ∞ame have been made and compared with experimental data. Results are obtained with a Reynolds averaged Navier-Stokes (RANS) v 2 i f model, a direct numerical simulation (DNS), and a detached eddy simulation (DES) model. The preliminary results are encouraging, with respect both to heat transfer and to the prediction of large-scale structures in these highly buoyant ∞ow flelds. 1. Motivation and objectives Although radiation is the dominant heat-transfer mechanism in flres, turbulent convection to or from a surface can be signiflcant. The convective regime typically encountered in flres is turbulent mixed convection. Due to large surfaces and large temperature differences, the Grashof number in flres can be quite high, e.g. 1:0£ 10 12 , and the efiects of variable properties can be signiflcant. Turbulent mixed-convection heat transfer from a large (3 meter) vertical, high-temperature (Tsurface up to 860K) surface was studied experimentally by Siebers, Schwind & Mofiat (1983). In that study, local and average heat transfer coe‐cients as well as boundary layer proflles of velocity and temperature were obtained; these quantities can be used for validation of computer models of turbulent convection heat transfer dint conditions commonly encountered in flres. The present work describes three approaches that use difierent formulations to solve the Navier-Stokes and energy equations to predict the ∞ow and heat transfer from a large, high temperature vertical surface. These three methods are: 1) a RANS formulation using the v 2 if model in an unstructured-control-volume flnite-element code to predict the steady ∞ow and heat transfer; 2) a DNS formulation of the unsteady free convection turbulent boundary layer on the high-temperature plate; and 3) a DES formulation that uses time flltering to allow large-scale time-dependent structures to be captured. Preliminary results were obtained during the summer program and are described in the following sections of this report." @default.
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- W2187777122 date "2002-01-01" @default.
- W2187777122 modified "2023-09-26" @default.
- W2187777122 title "Modeling convection heat transfer and turbulence with flre applications: a high temperature vertical plate and a methane flre" @default.
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