We study the dynamics and horizontal layering of homogeneous stably stratified turbulence (SST) from the point of view of two-point correlation spectra. We retain the most complete spectral description that is available in this axisymmetric setting, by computing the angular-dependent spectra, so that we observe the anisotropy of the flow at each scale — that is at a given wavenumber — and for e...

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...

In this study, the effect of different blade shapes on aerodynamic performance NACA series airfoils under a wide variety working conditions at Reynolds number Re = 700,000 was explored. The SST k-ω turbulence model used for CFD method to investigate leading edge erosion airfoils. results indicated that an optimal thickness range exists considering erosion. If airfoil too thin or thick, increase...

External heat transfer predictions are performed for two-dimensional turbine blade cascades. The Reynolds averaged Navier-Stokes equations with algebraic (Baldwin-Lomax) and two-equation (low-Re k ?) turbulence closures are solved with an explicit Runge-Kutta time-marching nite volume method. Comparisons with measurement for subsonic and transonic cascades show good agreement in some cases, but...

Prevailing high-speed air-breathing propulsion systems invariably banks on coaxial jets which plays a vigorous role in stabilization of flames and combustion emission. Coaxial jets have applications in supersonic ejectors, noise control techniques and enhancement of mixing. Coaxial jet nozzles regulate spreading rates by developing virtuous mean flow and shortening primary flow potential core l...

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 ...

Shock wave/boundary layer interaction (SWBLI) is a highly critical problem that occurs in aircraft transonic or supersonic flow. This study performed CFD analysis of the ramp flow freestream Mach number 2.79. To secure reliability analysis, adaptive mesh refinement using gradient p sensor was used. Through this, grid sufficient resolution obtained for region shock wave, expansion and separation...