Journal ArticleDOI
Separated flow about lifting bodies and impulsive flow about cylinders.
Reads0
Chats0
TLDR
In this paper, the cross-flow drag and normal force coefficients are determined experimentally as a function of the relative displacement of fluid in time-dependent two-dimensional flow, and the evolution with time of the body-wake characteristics are determined from high-speed motion pictures.Abstract:
The analogy between the impulsive flow over circular cylinders and flat plates and the separated flow about slender bodies moving at high angles of attack in the subsonic to moderately supersonic-velocity range is discussed. The cross-flow drag and normal force coefficients are determined experimentally as a function of the relative displacement of fluid in time-dependent two-dimensional flow. The evolution with time of the body-wake characteristics are determined from high-speed motion pictures. The results show that during the growth of symmetrical vortices, the laminar flow drag coefficients of the test bodies reach a value about 25% higher than their corresponding steady flow values. In the supercritical range, records for the drag show considerable disagreement, except that the drag coefficient lies between 0.25 and 0.40.read more
Citations
More filters
Book
Hydrodynamics of High-Speed Marine Vehicles
TL;DR: In this paper, the authors describe a planing vessel with wave resistance and propulsion, and planing vessels with planing, whipping, and springing, as well as a semi-displacement vessel.
Journal ArticleDOI
Some experimental results on sphere and disk drag
TL;DR: In this article, the authors measured the drag on spheres and disks moving rectilinearly through an incompressible fluid and used hydrogen bubble flow visualization to relate these forces to the unsteady wake flows.
Journal ArticleDOI
Inviscid Model of Two-Dimensional Vortex Shedding by a Circular Cylinder
Turgut Sarpkaya,Ray L. Schoaff +1 more
TL;DR: In this paper, a discrete vortex model based on potential flow and boundary-layer interaction, rediscretization of shear layers, and circulation dissipation is developed to determine the characteristics of an impulsively started flow about a circular cylinder.
Journal ArticleDOI
The representation of sheets of vorticity by discrete vortices
R R Clements,David J. Maull +1 more
TL;DR: The first representation of a continuous vortex sheet by discrete vortices was presented by Rosenhead (1932) when he investigated the instability of the surface of discontinuity between two streams of the same density but with velocities equal in magnitude (U) but opposite in direction as mentioned in this paper.
References
More filters
Journal ArticleDOI
Numerical Solution of the Problem of Vortex Street Development
Jacob E. Fromm,Francis H. Harlow +1 more
TL;DR: In this article, a method is described for the solution of time-dependent problems concerning the flow of viscous incompressible fluids in several space dimensions, using a high-speed computer for a finite-difference approximation to the partial differential equations of motion.
Journal ArticleDOI
Boundary layer growth
S. Goldstein,L. Rosenhead +1 more
TL;DR: In this paper, it was shown that the initial motion of a viscous incompressible fluid is irrotational, without circulation, when the fluid is started impulsively from rest.
Journal ArticleDOI
Calculations of unsteady viscous flow past a circular cylinder
TL;DR: In this paper, a numerical solution for the starting flow of a viscous fluid past a circular cylinder at Reynolds numbers 40 and 100 has been obtained for the vorticity equation of the flow.
Journal ArticleDOI
Boundary-Layer Growth
TL;DR: In this article, it is shown that if an infinite plane moves in its own plane in a viscous fluid, the velocity distributions are similar at different times if the velocity V{t] of the plane is of the form V(t) = Atα or V( t) = A ect, where t is the time.