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Showing 1 to 14 of 14 for “"no-slip condition"”.
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Sviluppo e validazione di un modello di film fluido per simulazioni CFD di motori a combustione interna
… implementation of the model. The major phenomena taken into account in the present model are: wall film formation by impinging spray; body forces, such as gravity or acceleration of the wall; shear stress at the interface with the gas and no slip condition on the wall; momentum contribution …
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Efeitos viscosos em cilindros imersos em fluidos não-newtonianos
… of a bi-dimensional interface immersed in a non-Newtonian fluid, whose rheological behaviour can be described by the power law model. Arbitrary values of the flow behaviour index (n) were considered and results for three different values are presented, including the case of a Newtonian fluid …
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THE VERTICAL STRUCTURE OF ESTUARINE TIDAL CURRENTS
… favorably with field data. Two lower boundary conditions are investigated; the usual no-slip condition, and a near bottom stress condition. The current velocity solution of the eddy viscosity model, using the latter boundary condition, is a linear function of bottom stress and surface slope. …
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Oscillations of a Fluid in a Channel
… we choose it to be $\frac{\pi}{2}$. As boundary conditions, we consider that the walls are impenetrable together with a perfect slip condition, and a no slip condition for the bottom. The main aim of this paper is to analyse the qualitative behavior of the flow (oscillations of periodic …
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Riblets in the viscous sublayer : Optimal Shape Design of Microstructures
… has established that a smooth surface has not necessarily minimal drag: Many experiments by different laboratories, e.g. NASA and DLR Berlin, indicate that an extra surface layer with tiny grooves aligned in the stream-wise direction can be used to reduce the drag. The aim of this project …
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Stress distributions around hydrofoils using computational fluid dynamics
… of the results when one of the boundary conditions is changed. Surprisingly, it was discovered that the FREE slip condition along the foil is much closer to reality than the NO slip condition. Another examination was stretching horizontally the foil and checking the pressure distribution …
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Influence of side walls and undulated topography on viscous gravity-driven film flow
… new effects emerge in the flow, which cannot be observed in flows over a flat incline. Eddies can separate from the main flow at the lee side of the undulation for kinematic reasons, or induced by inertial effects. In biological systems these eddies are dead water areas, which are cut off …
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Forces on a wall-bound leukocyte due to flowing red blood cells
… small but finite resistance to bending. The no-slip condition is applied both on the leukocyte and the vessel walls. The tube diameters for all cases are less than 20 microns. We will show that at these scales the cellular character of blood significantly affects the forces that the leukocyte …
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Rotating gravity current and channel flows
… by Benjamin (1968) to include energy loss in the non-rotating gravity current theory. The governing equations and numerical solutions for the three flow geometries are presented. For shallow currents the energy loss theory predicts that the Froude number tends to 2* irrespective of the rotation …
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The Influence of Occupational Footwear on Slip Responses
Falls in the workplace most often occur due to slips and unsuitable footwear. While industry standardized occupational footwear (OF) is required for the safety of occupational activities, little is known about how OF influences how individuals respond to an unexpected slip. Therefore, the purpose …
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An experimental study of a turbulent wing-body junction and wake flow
… geometry was formed by joining a 3:2 elliptic nose to a NACA 0020 tail section at their respective maximum thickness locations. The author's measurements were taken with approach flow conditions of Reθ = 6,300, and δ/T = .513, where T is the maximum body thickness. The results clearly show the …
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Meshless Direct Numerical Simulation of Turbulent Incompressible Flows
… were found when writing the boundary conditions. In all methods analyzed, it was found that it is basically impossible to satisfy the exact set of boundary conditions and all formulations use a reduced set, valid for parabolic flows only. For example, for segregated methods, boundary …
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The Development and Applications of a Numerical Method for Compressible Vorticity Confinement in Vortex-Dominant Flows
… added to the inviscid formulation, but with the no-slip condition enforced. This produced an unsteady separated flow that agreed well with experimental data and existing LES and RANS calculations. The next case described is the flow over a cubic protuberance on the floor of a channel. This flow …
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Elliptical Rolling Link Toggle Mechanisms for Passive Force Closures with Self-Adjustment
… are characteristic of such mechanisms, stress conditions are identified and principles for joint stability with variable, precision outputs are discussed. Finally, application is made to self-adjusting passive force closures with a case study of the MUSCLE Brake (Multi-toggle Self-adjusting …