Unsteady Viscous Flow around an Oscillating Aerofoil : 1st Report, Numerical Analysis, Part 1

厚, 岡島; 浩之, 高田; 強, 浅沼

doi:10.1299/kikai1938.37.2300

Cited by 4 publications

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“…Arie the condition (28) was applied was taken to be a hundred times the height of the obstacle throughout the present study. This distance is judged to be appropriate in view of the findings of Okajima et al (1971). Moreover, there are two facts supporting the use of a boundary with an even smaller radius than that in the case of a circular or elliptical cylinder in a uniform stream.…”

Section: Resultsmentioning

confidence: 92%

Viscous shear flow past small bluff bodies attached to a plane wall

Kiya

Arie

1975

J. Fluid Mech.

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Numerical solutions of the Navier-Stokes equations are presented for two-dimensional viscous flow past semicircular and semielliptical projections attached to a plane wall on which a laminar boundary layer has developed. Since the major axis is in the direction normal to the wall and is chosen to be twenty times as long as the minor axis in the present case, the flow around the semielliptical projection will approximately correspond to that around a normal flat plate. It is assumed that the height of each obstacle is so small in comparison with the local boundary-layer thickness that the approaching flow can be approximated by a uniform shear flow. Numerical solutions are obtained for the range 0·1-100 of the Reynolds number, which is defined in terms of the undisturbed approaching velocity at the top of the obstacle and its height. The geometrical shapes of the front and rear standing vortices, the drag coefficients and the pressure and shear-stress distributions are presented as functions of the Reynolds number. The computed results are discussed in connexion with the data already obtained in the other theoretical solutions and an experimental observation.

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Section: Resultsmentioning

confidence: 92%

Viscous shear flow past small bluff bodies attached to a plane wall

Kiya

Arie

1975

J. Fluid Mech.

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“…However, only a few studies have been made for a circular cylinder oscillating in a uniform flow. Bishop & Hassan (1964), Jones (1968) and some others measured the lift and drag forces acting on a, circular cylinder made to oscillate in a direction perpendicular to the stream, and recently Okajima, Takata & Asanuma (1971, 1972 studied experimentally and numerically the viscous flow around a torsionally oscillating circular cylinder. I n these studies, the existence of aeroelastic resonance was confirmed.…”

Section: Introductionmentioning

confidence: 99%

Stability of a circular cylinder oscillating in uniform flow or in a wake

1973

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The lift and drag forces were measured on both a single circular cylinder and tandem circular cylinders in uniform flow at Reynolds numbers from 40 to 104, to investigate the stability of an oscillating cylinder. A cylinder (the downstream one in the tandem case) was made to oscillate in either the transverse or longitudinal direction (perpendicular or parallel to the stream). In the case of a single cylinder, its oscillation causes the so-called synchronization in a frequency range around the Strouhal frequency (transverse mode) or double the Strouhal frequency (longitudinal mode). The aerodynamic damping for transverse oscillation becomes negative in the synchronization range. In the case of tandem cylinders, at low Reynolds numbers in the pure Kármán range synchronization was observed to occur only when the downstream cylinder oscillated inside the vortex-formation region of the upstream one, and at high (low subcritical) Reynolds numbers synchronization occurred irrespective of the cylinder spacing in either oscillating mode. In the tandem case, too, the transverse oscillation of the downstream cylinder becomes unstable in the range of synchronization.

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