We consider a family of high accuracy, approximate deconvolution models of turbulence. For body force driven turbulence, we prove directly from the models equations of motion the following bounds on the model’s time averaged energy dissipation rate, < "ADM >, and helicity dissipation rate, < ADM (w) >; < "ADM > 2 U3 L +Re 1 U3 L (1 + ( L )) , and j < ADM (w) > j U3 L2 + p 2Re 1 2 (1 + 2 L2 ) 1 ...

Shock waves generated at different parts of vehicle interact with the boundary layer over the surface at high Mach flows. The adverse pressure gradient across strong shock wave causes the flow to separate and peak loads are generated at separation and reattachment points. The size of separation bubble in the shock boundary layer interaction flows depends on various parameters. Reynolds-averaged...

The turbulent dispersion of non-evaporating droplets in an axisymmetric round jet issuing from a nozzle is investigated both experimentally and theoretically. The experimental data set has a well-defined inlet boundary with low turbulence intensity at the nozzle exit, so that droplet dispersion is not affected by the transport of nozzle-generated fluctuating motion into the jet, and is influenc...

The shape of the air flow in the interior is heavily influenced by the air distribution system and the way air enters and exits. By numerically simulating flow by computational fluid dynamics, one can determine the flow pattern and temperature distribution and, with the help of the results, provide an optimal design of the air conditioning system. In this study, a chamber was first constructed ...

The lag model proposed by Olsen and Coakley is incorporated into the baseline two-equation k-ω turbulence model to simulate the transonic and supersonic turbulent separated flow. The performances of the lagged k-ω turbulence model is assessed by computing two transonic airfoil flow cases, the RAE2822 Case 10 and the 18% thick double circular arc airfoil, and a separated nozzle flow. The computa...

A number of numer~cal simulations of rack storage fires have been carr~ed out, with various fuel types and burner outputs. Both the standard buoyancy-modified k E turbulence model and a recently developed turbulence model which significantly improves the consideration of the buoyancy effect on turbulence and turbulent transport, were used to study the turbulence of the buoyant flow. The flamele...

This reports the study on the flow behaviour, heat transfer and contamination distribution in a room. For this purpose the 3-D incompressible Navier-Stokes equations, energy equation and a mass transfer equation which model the concentration of contamination have been applied. For turbulence simulation the two equation standard k-  turbulence model was employed. By means of SIMPLE algorithm the...

A one-equation linear turbulence model and a two-equation nonlinear explicit algebraic stress model (EASM) are applied to the ow over a multielement airfoil. The e ect of the K-" and K-! forms of the two-equation model are explored, and the K-" form is shown to be de cient in the wallbounded regions of adverse pressure gradient ows. A new K-! form of EASM is introduced. Nonlinear terms present ...

Application of the Aventech AIMMS20AQ airborne probe for turbulence measurements during the Convective Storm Initiation Project K. M. Beswick, M. W. Gallagher, A. R. Webb, E. G. Norton, and F. Perry School of Earth, Atmosphere and Environmental Sciences, University of Manchester, UK School of Earth and Environment, University of Leeds, UK Received: 13 November 2006 – Accepted: 11 January – Publ...