A new Strouhal–Reynolds-number relationship for the circular cylinder in the range 47&amp;lt;Re&amp;lt;2×105

Fey, Uwe; König, Michael; Eckelmann, Helmut

doi:10.1063/1.869675

Cited by 280 publications

(156 citation statements)

References 13 publications

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“…As the Reynolds number increases, their spatial coherency is distorted. However, the Strouhal number defined as St = f v d c /|U |, (where f v is the vortex shedding frequency) remains fairly uniform, between 0.18 0.21 25 across a wide range of Reynolds number between 360 and 2 ⇥ 10 5 (Fey et al, 1998;Cava and Katul, 2008). Experimental evidence of von Kármán vortices in the canopy trunk space were provided by Seginer et al (1976), Poggi et al (2004b) and Poggi and Katul (2006).…”

mentioning

confidence: 93%

Revisiting Kelvin Helmholtz Instabilities and von Kármán Vortices in Canopy Turbulence

Banerjee

Roo

Linn

2017

Preprint

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Abstract. Studying turbulence in vegetation canopies is important in the context of a number of micrometeorological and hydrological applications. While recent focus has shifted more towards exploring different kinds of canopy heterogeneities, there are still gaps in the existing knowledge on the multiple types of dynamics involved in the case of horizontally homogeneous canopies. For example, experimental studies have indicated that turbulence in the canopy sublayer (CSL) can be divided into three regimes. In the deep-zone, the flow-field is dominated by von Kármán vortex streets and interrupted by strong sweep 5 events. The second zone near the canopy top is dominated by attached eddies and Kelvin-Helmholtz waves associated with the velocity inflection point in the mean longitudinal velocity profile. Above the canopy, the flow resembles classical boundary layer flow. In this study, these different kinds of dynamics are studied together by means of a large eddy simulation (LES).The main theme of this work is to address the question whether the parametrization of the canopy by a distributed drag force in numerical simulations instead of placing real solid obstacles is consistent with the three layer conceptual model. Unique 10 techniques such as measures from information theory and coupled oscillator analysis are used to extract the coherent structures associated with the two motions. It can be stated that a better understanding of the rich dynamics associated with the simplest case of canopy turbulence can lead to more efficient simulations and more importantly improve the interpretation of more complex scenarios.

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mentioning

confidence: 93%

Revisiting Kelvin Helmholtz Instabilities and von Kármán Vortices in Canopy Turbulence

Banerjee

Roo

Linn

2017

Preprint

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“…where λ and τ are constants and given in Table 1 of [14] (additional values were calculated in [10]). …”

Section: Tone Frequencymentioning

confidence: 99%

“…Using data published in [14] the discrete Strouhal number S t was calculated, Equation (4). Thereafter, a discrete implementation of Equation (2) was used to obtain the lift fundamental frequency f l .…”

Section: Fundamental Frequency Calculationmentioning

confidence: 99%

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Sound Synthesis of Objects Swinging through Air Using Physical Models

Selfridge¹,

Moffat²,

Reiss³

2017

Applied Sciences

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Featured Application: A real-time physical model sound effect that can replicate the sound of a number of swinging objects, such as a sword, baseball bat and golf club, has great potential for dynamic environments within virtual reality or games. The properties exposed by the sound effects model could be automatically adjusted by a physics engine giving a wide corpus of sounds from one simple model, all based on fundamental fluid dynamics principles.Abstract: A real-time physically-derived sound synthesis model is presented that replicates the sounds generated as an object swings through the air. Equations obtained from fluid dynamics are used to determine the sounds generated while exposing practical parameters for a user or game engine to vary. Listening tests reveal that for the majority of objects modelled, participants rated the sounds from our model as plausible as actual recordings. The sword sound effect performed worse than others, and it is speculated that one cause may be linked to the difference between expectations of a sound and the actual sound for a given object.

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“…After the periodic mode is set in, the Strouhal number is found to be S t = 0.1936. For vortex shedding from a circular cylinder, an empirical relation was proposed by Fey et al [107] which is given as…”

Section: Circular Cylinder In a Uniform Mean Flowmentioning

confidence: 99%

Aero-acoustic computations of wind turbines

Shen

Michelsen²,

Sørensen³

2002

2002 ASME Wind Energy Symposium

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A new Strouhal–Reynolds-number relationship for the circular cylinder in the range 47<Re<2×105

Abstract: A coupled Landau model describing the Strouhal-Reynolds number profile of a three-dimensional circular cylinder wake Phys. Fluids 15, L68 (2003);

Cited by 280 publications

References 13 publications

Revisiting Kelvin Helmholtz Instabilities and von Kármán Vortices in Canopy Turbulence

Revisiting Kelvin Helmholtz Instabilities and von Kármán Vortices in Canopy Turbulence

Sound Synthesis of Objects Swinging through Air Using Physical Models

Aero-acoustic computations of wind turbines

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