|Statement||W.F. Xing and G. Marenbach.|
|Series||NASA technical memorandum -- NASA TM-77854., NASA technical memorandum -- 77854.|
|Contributions||Marenbach, G., United States. National Aeronautics and Space Administration.|
|The Physical Object|
Vortex Shedding Characteristics of the Wake of a Thin Flat Plate with a Circular Trailing Edge The near and very near wake of a thin flat plate with a circular trailing edge are investigated with direct numerical simulations (DNS). Data obtained for two different Reynolds numbers (based on plate thickness, D) are the main focus of this study. On the side of the gap to which the flow is deflected, called the narrow-wake side, periodic vortex shedding is detected at the outer edges of the wake shear layer and the gap flow. previous paper12 where it has been shown that this planar symmetric vortex shedding may exist upto a Reynolds number of about Figure 3a shows the frequency spectra corresponding to the temporal variation of the transverse velocity component at one location in the near wake. The spectra indicates a vortex shedding Strouhal number of 0. study is concerned about the periodic vortex shedding formed in the wake of an objects placed in triangular rigid narrow channels. This basic experimental study will help to understand the frequency of vibration due to formation of vortex shedding and its coincident with natural frequency of the object. This in turn will help to calculate the periodic force which becomes spatially correlated to.
Onset of periodic flow from the small cylinder induces oscillatory forces on the body, which may trigger flow-induced vibration, and in turn alter the vortex shedding on the main cylinder. For the investigation of velocity gradient effects, the simplest case of a non-uniform flow is the uniform shear flow, which has a linear distribution of the. Periodic vortex shedding phenomenon for various separation distances between two plane turbulent parallel jets Spatio-temporal linear stability analysis of stratified planar wakes: Velocity and density asymmetry effects. Physics of Fluids, Vol. 28, No. 4 The effect of a wake-mounted splitter plate on the flow around a surface-mounted. K. Chen, T. Colonius, and K. Taira, "The Leading-Edge Vortex and Quasi-Steady Vortex Shedding on an Accelerating Plate" Physics of Fluids, 22, , , K. Taira, C. W. Rowley, and T. Colonius, "Feedback Control of High-Lift State for A Low-Aspect-Ratio Wing," 48th AIAA Aerospace Sciences Meeting and Exhibit, Orlando, FL, Jan. When vortex shedding is attenuated, the integral length scale Lu grows more slowly in the streamwise direction, this being verified both for FSG17 and for SSG+SP. In the production region, there is a correlation between the vortex shedding energy and the skewness and the flatness of the velocity fluctuations. When vortex shedding is not.
Get this from a library! Periodic vortex shedding in the supersonic wake of a planar plate. [W F Xing; G Marenbach; United States. National Aeronautics and Space Administration.]. Reynolds number is in the periodic vortex shedding regime and less than where the three- dimensional modes A or B [5,6] can appear in the circular cylinder wakes. The control of end effects was monitored by a small water stream created by suction through two pipes (visible. The vortex shedding frequency was observed in the spectra of pressure fluctuations on both faces of the plate, while a lower frequency spectral peak was only evident on the leeward pressure fluctuations. Local sharp peaks of low pressure in the separated shear layers coincide with increases in the leeward face pressure fluctuations. The Effect of Aspect Ratio on the Three-Dimensional Vortex Formation of Rotating Flat-Plate Wings. Vortex Shedding and Wake Structure of a Plunging Wing. Vortex-wake characteristics of a supersonic transport wing planform at Mach