To simulate the effect of free st ream turbulence on turbulent spot formation, experiments were conducted on the interaction of localized three-dimensional disturbances with the harmonic waves in a laminar boundary layer on a flat plate. Experiments conducted in three-dimensional diverging flow (but zero pressure gradient) show, while individually the disturbances decay downstream, their intera...

whelming. On the other hand, the development of efficient numerical methods for solution of the Navier–Stokes equaEfficient preconditioned multigrid methods are developed for both inviscid and viscous flow applications. The work is motivated tions remains one of the ongoing challenges in the field by the mixed results obtained using the standard approach of scalar of computational fluid dynamic...

mixed convection is a fundamentally significant heat transfer mechanism that occurs in selection industrial and technological applications. in this study, first the laminar mixed convection inside rectangular enclosure with moving wall and aspect ratio=10 is modeled and then the results are compared with other investigate. after showing varity of results, the investigation is continued with tur...

Regurgitation in the heart diastolic phase represents a critical flow condition associated with many heart valve design considerations. The finite volume method, the Low-Reynolds-Number k-ω turbulent model and sliding mesh model are employed to solve and compare the complex flow field and the torque in each case. The end results expected from a cardiovascular CFD analysis are not limited only t...

A flap can be used as a high-lift device, in which a downward deflection results in a gain in lift at a given geometric angle of attack. To characterize the aerodynamic performance of a deflected surface in compressible flows, the present study examines a naturally developed turbulent boundary layer past the convex and concave corners. This investigation involves the analysis of mean and fluctu...

Entropy (temperature) fluctuations produced by turbulent flames generate noise when they are accelerated the flow. This so-called entropy is an important contributor to core in modern aeroengines and several semi-analytical models exist literature for its prediction. All these assume flow be inviscid. In present paper, contribution of viscosity on generation scattering through a nozzle investig...

Turbulent drag reduction in wall-bounded flows is investigated experimentally by considering the dynamic effects provoked by large variation of anisotropy in the velocity fluctuations. It is shown that high drag reduction is obtained when the velocity fluctuations near the wall reach the statistically axisymmetric state with invariance under rotation about the axis aligned with the mean flow. D...

This paper presents the development of a three-dimensional high-order solver with unstructured spectral difference method. The solver employs the formulations of Sun et al. It is implemented on unstructured hexahedral grid elements. It is firstly validated using test problems of 2D and 3D subsonic inviscid flows past a circular cylinder. The spectral difference method constructs element-wise co...