...Puxuan Li; Matthew Campbell; Ning Zhang; Steve J. Eckels This study proposes a numerical model to collect and analyze relationships between flow structures and drag forces on a microfin enhanced surface. We utilized a large eddy simulation (LES) with a localized, dynamic kinetic energy, subgrid...

... and drag are compared with the results on the flat substrate. Enhanced drag and significantly enhanced lift are observed as the test particle is situated near the summit of the hill. A detailed grid refinement analysis [ 69 ] is carried out on successively refined grids to estimate the error...

... Aerodynamics Compressible flows Drag Free shear layers Gas dynamics Supersonic flows Transonic flows Unsteady flows Wakes Base and afterbody flow constitute an important class of separated flows that govern the performance and stability of an aerospace vehicle. Investigations into the base...

... lock-in error as the difference between Triantafyllou's fish Strouhal number and the tangent of the vortex-shedding angle, an experiment is discussed for measuring the minimum drag of live fish. Contributed by the Fluids Engineering Division of ASME for publication in the J OURNAL OF F LUIDS E...

... of the curved diffuser is that any local flow separation and reattachment could give locally reduced skin friction and consequently lower drag. Figure 28 indicates, however, an absence of flow separation along the centerline of both plane and curved diffuser ramp surfaces. The substantial decrease in skin...

... analysis are also carried out for the pitching blade. The performance of the investigated turbulence models is evaluated at various critical points on the hysterias loop of lift and drag coefficients. The predictions of the investigated turbulence models are in good agreement at lower angle of attack, i.e...

... LUIDS E NGINEERING . Manuscript received October 3, 2017; final manuscript received May 18, 2018; published online June 26, 2018. Assoc. Editor: Samuel Paolucci. 03 10 2017 18 05 2018 Aerodynamics Computational fluid dynamics Drag Lift Unsteady flows Wakes Flow past...

... configuration is actuated by means of a synthetic jet boundary condition. Overall, the effect of the actuation is beneficial. The actuation of the AFC decreases drag, stabilizes the flow, and reduces the size of the side recirculation bubble. Partially‐averaged Navier–Stokes were employed for the numerical...

...Upender K. Kaul; Nhan T. Nguyen A Reynolds-averaged Navier–Stokes (RANS) computational study was conducted to investigate the effect of various variable camber continuous trailing edge flap (VCCTEF) configurations on the lift and drag of a NASA generic transport model (GTM) wing section. Out...

... width, ( 19.28 mm ≤ W ≤ 25.75 mm ), and angle of attack, ( 0 deg ≤ ψ ≤ 12.6 deg ). A total of six wheels and five tires were tested. Coefficient of drag area ( C d A ) and coefficient of side force area ( C s A ) versus angle of attack (ψ) were measured using a multi-axis force transducer. Wind tunnel...

...Xin Zhang; Xili Duan; Yuri Muzychka Flow drag reduction induced by chemical additives, more commonly called drag-reducing agents (DRAs), has been studied for many years, but few studies can manifest the mechanism of this phenomenon. In this paper, a new mathematical model is proposed to predict...

... = liquid dynamic viscosity ν = liquid kinematic viscosity ρ = density σ = surface tension C a = capillary number ( C a = μ U / σ ) C D = drag coefficient C m = virtual mass coefficient Eo = Eötvös...

...Michell Luiz Costalonga; Bruno Venturini Loureiro; Edson J. Soares We analyze the use of water solutions of Xanthan Gum (XG) for drag reduction (DR) in annular spaces. We provide a direct quantitative comparison between the DR in an annulus and that in straight tubes. We can fairly compare the data...

... Drag Flows in biological systems Fluid-structure interaction Naval hydrodynamics Turbulence Unsteady flows The world is becoming acoustically noisier. For example, due to the rapid rise in shipping, the low-frequency ambient acoustic noise in the ocean is increasing at an average rate...

... of ASME for publication in the J OURNAL OF F LUIDS E NGINEERING . Manuscript received April 12, 2017; final manuscript received September 2, 2017; published online October 19, 2017. Assoc. Editor: Daniel Livescu. 12 04 2017 02 09 2017 Complex flows Drag Duct Rotating fluids...

... = forward projected surface area of a single roughness element A s = windward wetted surface area of the element C = a constant in the velocity profile, Eq. (4) C D = form drag coefficient C f = 2 τ w / ρu 2 s , skin friction coefficient k = height...

...; published online September 20, 2017. Assoc. Editor: Hui Hu. 20 03 2017 06 08 2017 Aerodynamics Boundary layers Drag Experimental techniques Lift Measurement techniques PIV Turbulence Vortices Fluid mechanics As the unmanned aerial vehicles avoid risks to humans...

...Shiyang Hou; Jibin Hu; Zengxiong Peng The drag torque caused by the viscous shear in open multiplate wet clutches has been studied in most available literature whose focus is placed on low circumferential speed. However, the drag torque increases drastically in the high circumferential speed range...

...; final manuscript received May 2, 2017; published online July 19, 2017. Assoc. Editor: Feng Liu. 11 07 2016 02 05 2017 Aerodynamics Drag Lift Low Reynolds number flows are associated with a range of unique fluidic phenomena [ 1 ]. Notable are the presence of laminar...

... layers Drag Gas dynamics Measurement techniques PIV Fluid mechanics Wall shear stress τ w is an important fluid flow parameter in many engineering applications. It serves as a scaling parameter in wall bounded flows, manifests itself in the formation of viscous drag on moving bodies...