2 edition of study of vortex shedding around bluff bodies in stratified fluid flow found in the catalog.
study of vortex shedding around bluff bodies in stratified fluid flow
D. A. MacBean
Written in English
Project - University of Surrey, 1995.
|Statement||D. A. MacBean.|
|Contributions||University of Surrey. Department of Mechnical Engineering.|
Hydrodynamic Damping, Flow-Induced Oscillations, and Biharmonic Response T. Sarpkaya Mechanical Engineering, Naval Postgraduate School, Cited by: The vortex shedding from two circular cylinders of different diameters in a tandem arrangement is numerically investigated at a Reynolds number of and The studied Reynolds number based on the diameter of the downstream main cylinder. The diameter of the downstream main cylinder was kept constant, and the diameter ratio between the upstream control cylinder and Author: Yong Tao Wang, Zhong Min Yan, Hui Min Wang.
UNSTEADY VISCOUS VORTEX WITH FLOW TOWARD THE CENTER* by Robert G. Deissler Lewis Research Center SUMMARY An analysis was made of a strong unsteady vortex that consists of an annular region, in which the flow is tangential and radial, and a core region, in which a uniform axial flow is also Size: KB. ! 1!!!!! HENRI!BÉNARD:!THERMAL!CONVECTION!AND!VORTEX!SHEDDING! José!Eduardo!Wesfreid*! Physique)et)Mécanique)des)Milieux)Hétérogènes,)CNRS,)ESPCI,)PSL)Research Cited by: 1.
The article entitled “Features of the turbulent flow around symmetric elongated bluff bodies” (Chapter 2) is co-authored by my two co-supervisors and Ms. Emanuela Palombi. Ms. Palombi is a former student of my co-supervisors. She and I performed the initial PIV experiments on the symmetric bluff bodies featured in this article. Ms. Flow Around Immersed Bodies - We see that when a solid body is held in the path of a moving fluid and is completely immersed in it, the body will be subjected to some pressure or force. Conversely, if a body is moved with a uniform velocity through a fluid at rest, it offers some resistance to the moving body or the body has to exert some force to maintain its steady .
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At KC=16 the vortex shedding pattern is likely to be unstable. This acute sensitivity to changing KC number makes the flow around a circular cylinder in oscillatory flow particularly difficult to predict.
No review of bluff bodies in oscillatory flow or waves would be complete without some discussion of the applicability of Morison's equation. Vortex Shedding from Oscillating Bluff Bodies. Annual Review of Fluid Mechanics Figure 4: Configuration of a lamellar fluid when a shear flow is applied.
The shear velocities are v = 0 (a), v = (b), and v = (c) (Gonnella et al ). Simulation of the flow around a pickup truck using a ghost-cell method (Kalitzin et al. Cited by: In this paper the various types of vortex generation and the related response characteristics of bluff bodies are described.
The vortices are, in general, generated by a certain stimulation, leading to one- or two-shear layer instability; the related unsteady forces could excite flexible structures such as tall towers, tall buildings and long-span by: Study of the vortex shedding flow around a body near a moving ground Article (PDF Available) in Journal of Wind Engineering and Industrial Aerodynamics 99(1).
most common experiment using wind tunnel is investigation of vortex shedding. This is because the phenomenon of regular vortex shedding behind bodies in a stream of fluid is often observed in nature. For example, vortex streets can be observed on a large scale in satellite images of cloud cover behind mountainous islands.
Consider the flow around a circular cylinder immersed in a large fluid region bounded by a moving plane surface as shown in Fig. 1.A uniform incoming flow with freestream velocity U from left to right is assumed, where the coordinates system is fixed on the cylinder.
The fluid is Newtonian with constant properties and flowing in a two-dimensional plane; the compressibility effects are Cited by: 9. A note on bluff body vortex formation - Volume - Owen M. Griffin. The effect of serrated fins on the flow around a circular cylinder. KSME International Journal, Vol.
17, Issue. 6, p. Feedback control of bluff body vortex shedding. Fluid Mech. Cited by: Study of the vortex shedding ﬂow around a body near a moving ground Alex Mendonc-a Bimbatoa,n, Luiz Antonio Alcantara Pereiraˆ a, Miguel Hiroo Hiratab a Institute of Mechanical Engineering, Federal University of Itajuba, Itajuba, CP 50, Minas Gerais, Brazil b State University of Rio de Janeiro, FAT-UERJ, Resende, Rio de Janeiro, Brazil article info.
bluff body is placed in a fluid flow, the resulting forces and vortex shedding pattern may be completely different from those found on a single body at the same Reynolds number. Bearman and Wadcock  measured the pressure distribution around two cylinders in a side-by-side arrangement, and found a repulsive force between theFile Size: KB.
The study of vortex shedding from bluff bodies is important, particularly for industrial applications where efficiency and performance are main design criteria. In order to enhance the aerodynamic properties of a given structure in cross-flow an understanding of the flow dynamics must be established, allowing.
A moving body in a stratified fluid produces upstream disturbances, groups of attached internal waves, leading-edge vortices, and a vortex street in the. The full text of this article hosted at is unavailable due to technical difficulties.
Vortex shedding from spheres has been studied in the Reynolds number range Cited by: Basara B., Bachler G., Schiffermuller H. () Calculation of vortex shedding from bluff bodies with the Reynolds-stress model. In: Kutler P., Flores J., Chattot JJ.
(eds) Fifteenth International Conference on Numerical Methods in Fluid Dynamics. Lecture Notes in Physics, vol Springer, Berlin, Heidelberg. First Online 04 May Cited by: 2.
A Kármán vortex street is a series of vortex pairs formed at the upper and lower side of a bluff body when a flow with a certain Reynolds number is passing. The vortex street is formed when the Reynolds number reaches a certain critical value, Re cr, at flows above this Reynolds number the periodic vortex shedding is Size: 3MB.
Vortex shedding PDF method Unsteady RANS Finite volume Bluff bodies The project was supported by the National Natural Science Foundation of China (), and the Fundamental Research Funds for the Central Universities (WK, WK).Cited by: 1. An Internet Book on Fluid Dynamics Vortex Shedding As we discussed in section (Dbc), the wake behind a cylinder in a uniform stream grows as the Reynolds number is increased above aboutRe = 5.
Between 5 File Size: KB. The turbulent flow around square-based, surface-mounted pyramids, of height h , in thin and thick boundary layers was experimentally influence of apex angle ζ and angle of attack α was ascertained from mean surface flow patterns and ground plane pressure measurements taken at a Reynolds number of × 10 4 based on h .For both Cited by: 7.
Direct numerical simulation (DNS) of flow past a square cylinder at a Reynolds number of has been carried out to explore the effect of blowing in the form of jet(s) on vortex shedding. Higher order spatial as well as temporal discretization has been employed for the discretization of governing equations.
The varying number of jets, jet velocity profiles and Cited by: Prediction of Vortex Shedding From Circular and Noncircular Bodies in Supersonic Flow M. Mendenhall and S. Perkins, Jr. Nielsen Engineering G Research, Inc.
Momtain View, California Prepared for Langley Research Center under Contract NASl National Aeronautics and Space AdministrationFile Size: 7MB. The focus of the present investigation is resolution of the vortical motion within the near wake of two example bluff bodies.
Specifically, the mixing of the secondary eddies and primary Strouhal vortex frequencies in the separated shear layer of a circular cylinder and the subsequent vortical motion in the near wake are numerically investigated using the large-eddy simulation (LES).
Studies have shown that shaping the trailing edge of a quasistreamlined bluff body in the form of a sinusoidal wave can result in substantial base pressure recovery. “ A study of three-dimensional aspects of vortex shedding from a bluff body with a D.
Lee, W. P. Jeon, S. Hahn, J. Kim, J. Kim, J. Choi, and H. Choi, “ Drag reduction Cited by: A two dimensional discrete vortex method has been developed to simulate the unsteady, incompressible flow field and aerodynamic loading on bluff bodies.
The method has been validated successfully on a range of simple bluff geometries, both stoic and oscillating, and has also been validated on a wider range of problems including static and oscillating suspension .