Results 181 to 190 of about 4,435 (226)
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Problems in Forced Unsteady Fluid Mechanics.
1981Abstract : Forced unsteady fluid flows are examined from the point of view of positive implications of the time dependency. Particular problems examined in a forced unsteady mode are jets, wind tunnels, wings, ramps and diffusers, dump combustors and vortex structure.
David Bougine +4 more
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Unsteady Fluid Forces Acting on a Pitching Foil
Journal of Fluid Machinery, 2005An oscillating foil can produce a driving force through the generation of a reversed vortex street, and it can be expected to be a new highly effective propulsion system. A simple pitching foil model was made and it was operated within a water channel.
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Direct Measurement of Unsteady Fluid Dynamic Forces for a Hovering Dragonfly
AIAA Journal, 2005An experimental study of the aerodynamics of a dragonfly in hovering flight is conducted. Measurements are made on a mechanical flapping wing apparatus that simulates, in water, the Reynolds number and reduced frequency of the tandem wing configuration on a dragonfly.
Manabu Yamamoto, Koji Isogai
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Unsteady fluid-dynamic force solely in terms of control-surface integral
Physics of Fluids, 2005In experimental aerodynamics (and hydrodynamics) it is well known that, if the flow past a solid body is steady, then the total force on the body can be conveniently estimated by the measured flow data on an appropriate control surface alone. We now show that, for the first time, the steady-flow condition can be removed provided that the flow is ...
Wu, Jie-Zhi, Pan, Ze-Liang, Lu, Xi-Yun
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Prediction of fluid forces acting on a hand model in unsteady flow conditions
Journal of Biomechanics, 2008The aim of this study was to develop a method to predict fluid forces acting on the human hand in unsteady flow swimming conditions. A mechanical system consisting of a pulley and chain mechanism and load cell was constructed to rotate a hand model in fluid flows. To measure the angular displacement of the hand model a potentiometer was attached to the
Shigetada, Kudo +4 more
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Propulsive Vortical Patterns and Unsteady Fluid Forces of a Flapping Airfoil
Volume 1: Fora, Parts A, B, C, and D, 2003It is known that a flapping airfoil can produce a thrust force through the generation of a reversed Ka´rma´n vortex street and this can be expected to be a new highly effective propulsion system. A flapping airfoil model was made and it was operated within a water channel.
Chang-Jo Yang +2 more
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Force acting on a particle in unsteady flow of a pseudoplastic fluid
Journal of Applied Mechanics and Technical Physics, 2016The accelerated flow of a pseudoplastic fluid around a quiescent sphere at Reynolds numbers Re = 0–200 and dimensionless acceleration Ga = 10–104 is studied by numerical simulation. It is shown that the analytical expression of the added mass force for an ideal fluid is appropriate for a pseudoplastic fluid. An expression for calculating the hereditary
O. B. Bocharov, Ya. S. Ignatenko
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Unsteady Forced Convection Heat Transfer for Power Law Fluids in a Pipe
2010 14th International Heat Transfer Conference, Volume 2, 2010This paper studied the problem of forced convection heat transfer for power law fluids in a pipe which was affected by the varying inlet temperature. The fluid flow was hydrodynamically fully-developed and laminar while the effects of viscous dissipation and the power law kinematic viscosity on heat transfer were considered.
Botong Li, Liancun Zheng, Xinxin Zhang
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Unsteady Fluid Flow and Force on an Obstruction in a Pipe
Fluids Engineering, 2000Abstract An unsteady fluid flow in a pipe with an orifice or an obstruction is studied. The velocity in the pipe and the force on the obstruction are calculated numerically. Several different forcing functions are considered for this unsteady flow system: a sinusoidal forcing function, a step forcing function, and a ramp forcing function.
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Computational Methods for Unsteady Fluid Force Predictions Using Moving Mesh Large Eddy Simulations
43rd AIAA Aerospace Sciences Meeting and Exhibit, 2005The o w around a stream-wise oscillating circular cylinder in a steady uniform o w is computed using large eddy simulations (LES). A nite volume method with capability to handle moving meshes is employed. The results are used for comparison with experiments for validation of the algorithms.
Mattias Liefvendahl, Eric Lillberg
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