..., is also prone to the pressure drag at higher moving speeds [ 70 ]. Fig. 22 Palau Nautilus ( Nautilus belauensis ) [ 71 ] Palau Nautilus (Nautilus belauensis) [71] Fig. 23 Planar cross section of Pearly Nautilus ( Nautilus pompilius ) [ 72 ] Planar cross section of Pearly Nautilus...

...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. drag lift aerosolization dustiness computational fluid dynamics National Institute for Occupational Safety...

... 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...

... investigated in CFD was not optimized, downforce and drag were slightly increased from those of the plane-surface diffuser by 1% and 0.4%, respectively due to the pressure–velocity behavior of the curved section. Fig. 29 Midplane time-averaged streamwise velocity ( u ) profiles within the sub...

... 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...

... Drag Lift Unsteady flows Wakes Flow past rotating cylinders is one of the widely studied problems in fluid dynamics. It gives valuable insights into the flow control aspects of bluff body flows. Some researchers have used rotating cylinders as lifting surfaces by utilizing the magnus effect...

... 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. Fig. 19 Instantaneous streamwise flow velocity: unactuated...

...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...

... ] was not considered here. A comparison is attempted between the present solution and the numerical solution of Wang and Tong [ 26 ].Their pipe diameter was 0.025 m, but they did not specify the length of the bubble. 17 02 2017 05 11 2017 Bubbly flows Drag Fluid transients Gas-liquid...

...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...

.... Assoc. Editor: Daniel Livescu. 12 04 2017 02 09 2017 Complex flows Drag Duct Rotating fluids Channel Pipe flows Ball valve, as a necessary component in the pipeline system, is commonly used to regulate flow rate and flow direction or control the stopping and starting...

... AOA at Re = 4 × 10 4 for U b /U of 0, 2, 4, and 6: ( a ) lift coefficient C L , ( b ) drag coefficient C D , ( c ) lift-to-drag ratio C L /C D , and ( d ) C L max and Stall AOA The control strategy depends on simple boundary layer physics. Usually, due to friction, the flow...

... ] or the Sigal-Danberg [ 7 ] based correlation. A f = 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...

...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...

... to carry approximately 80% of the total lift load. The top surface caused a pitching moment reversal associated with nonlinearity in the lift curve. c = chord C d = drag coefficient (= d /(0.5 ρU 2 S )) C dmin = minimum drag coefficient C do = drag coefficient...