توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Experimental Study of Flow Control on Bluff Body using Piezoelectric Actuators
اطلاعات انتشار: Journal Of Applied Fluid Mechanics، نهم،شماره۲، ۲۰۱۶، سال
تعداد صفحات: ۱۲
Active flow control is experimentally investigated on a car–type bluff body. The actuation is based on a synthetic jet actuator placed at the top of the Ahmed body rear window. In the present paper, a synthetic jet characterization is presented, the frequencies and the optimal amplitudes with regard to the spatial evolution are analyzed. All the measurements are carried out in a wind tunnel at Reynolds numbers based on the body length between 106 and 3106. The bluff body shows a maximum drag reduction of 10% when optimal control is applied. Independent effect of the reduced frequency and the momentum coefficient actuation parameters on the drag reduction are also detailed in the present paper. This reduction induces changes in the flow field due to the piezoelectric actuation. The flow topology modification is investigated via particle image velocimetry measurements in order to estimate the flow response to a local excitation and to understand the mechanism involved in the aerodynamic drag control.

۲Turbulent Plane Impinging Jet–Physical Insight and Turbulence Modeling
اطلاعات انتشار: Journal Of Applied Fluid Mechanics، نهم،شماره۳، ۲۰۱۶، سال
تعداد صفحات: ۷
A 3D numerical simulation using large eddy simulation (LES) method is performed for a submerged turbulent water slot jet impinging normally on a flat plate with a nozzle–to–plate distance of 10 jet width and a Reynolds number of 16000 and the results are compared with the existing experimental data. The numerical platform is an open source CFD code based on the field operation and manipulation C++ class library for continuum mechanics (OpenFOAM) and is used to simulate the flow and represent the mean and instantaneous flow field characteristics. Also, simulations are performed with two different subgrid–scale (SGS) models, one–equation based subgrid–scale model and localized dynamic smagorinsky model. Evaluating the different subgrid–scale (SGS) models, a priori and a posteriori test is done. Comparison between results obtained using the SGS models and experimental data shows that the simulation results using localized dynamic Smagorinsky model are more compatible with the experimental data compared with those that obtained from the kinetic energy one–equation model especially in regions close to the impingement wall and in free jet region.
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