50 research outputs found
The study of base heating by radiation from exhaust gases final report, oct. 1, 1963 - sep. 30, 1964
Base heating by radiation from exhaust gase
Experimental Investigation and Large-Eddy Simulation of the Turbulent Flow past a Smooth and Rigid Hemisphere
Computations carried out on the German Federal Top-Level Computer SuperMUC at LRZ Munich under the contract number pr84na.International audienceThe objective of the present paper is to provide a detailed experimental and numerical investigation on the turbulent flow past a hemispherical obstacle (diameter D). For this purpose, the bluff body is exposed to a thick turbulent boundary layer of the thickness δ = D/2 at Re = 50,000. In the experiment this boundary layer thickness is achieved by specific fences placed in the upstream region of the wind tunnel. A detailed measurement of the upstream flow conditions by laser-Doppler and hot-film probes allows to mimic the inflow conditions for the complementary large-eddy simulation of the flow field using a synthetic turbulence inflow generator. These clearly defined boundary and operating conditions are the prerequisites for a combined experimental and numerical investigation of the flow field relying on the laser-Doppler anemometry and a finite-volume Navier-Stokes solver for block-structured curvilinear grids. The results comprise an analysis on the unsteady flow features observed in the vicinity of the hemisphere as well as a detailed discussion of the time-averaged flow field. The latter includes the mean velocity field as well as the Reynolds stresses. Owing to the proper description of the oncoming flow and supplementary numerical studies guaranteeing the choice of an appropriate grid and subgrid-scale model, the results of the measurements and the prediction are found to be in close agreement
Turbulent kinetic energy budgets in a model canopy: comparisons between LES and wind-tunnel experiments
Closure to “Discussion of ‘The Effect of Mass Injection on Heat Transfer From a Partially Dissociated Gas Stream’” (1967, ASME J. Heat Transfer, 89, pp. 213–216)
State PMVI program evaluation. Final report.
National Highway Traffic Safety Administration, Washington, D.C.Mode of access: Internet.Author corporate affiliation: Chilton Company, Radnor, Pa.Report covers the period March 1977-Aug 1978. Released May 1979. Contract amount - $202,228Subject code: DFSubject code: DOCSubject code: DZN*NOOSubject code: FGDSubject code: RCGB*D