Strouhal Number
The Issue of Strouhal Number Definition in Cavitating Flow
... the Strouhal number has been used to define the nature of cavitation cloud shedding in many ...and Strouhal numbers with different definitions for several well-defined experiments were ...the ...
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Rainbow trout provide the first experimental evidence for adherence to a distinct Strouhal number during animal oscillatory propulsion
... The relationship between movement and forward velocity (U) in animals moving at a constant cruising speed using oscillatory propulsion is thought to converge upon an optimum range of a dimensionless parameter, the ...
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Bluff body flow : wake behavior behind a heated circular cylindeer
... Figure 19 gives a close view of the fluctuation of the drag coefficient. The average value is -1.3 and the deviation is plus and minus 0.02. The shedding of one vortex causes one sine wave in the graph, and the frequency ...
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Effects Of Frequency Variation At Inlet Flow On The Vortex Shedding Frequency Behind A Circular Cylinder
... Due to these phenomena, the ow at Re=300 was deeply considered in the analyses of this study. In addition to the familiar Karman vortex street behind a stationary cylinder in a uniform stream, several other complex ...
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Experimental research on cavitation in a water tunnel at the University of Michigan
... cavitation number. First, for a decreasing cavitation number, the vorticity decreases until the Strouhal peak and then stays constant for smaller cavitation ...
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Wake transition and blockage effects on cylinder base pressures
... - Reynolds Number - Rd FIGURE 13 STROUHAL NUMBER FOR 0.125 INCH CYLINDER ACROSS NOTED "TRANSITION" POINT... - Blockage Ratio D/ H FlG.15 VARIATION OF THE BASE PRESSURE COEFFICIENT WITH B[r] ...
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Wake structures behind a swimming robotic lamprey with a passively flexible tail
... different Strouhal numbers for models with different stiffness, whereas we altered the driving amplitude in order to match Strouhal number for the different values of ...
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The effect of body size on the wing movements of pteropodid bats, with insights into thrust and lift production
... Strouhal number can be employed as a dimensionless descriptor of flight speed for flapping swimmers and ...with Strouhal numbers between ...The Strouhal numbers of corridor-flown animals in ...
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Sink and swim: kinematic evidence for lifting body mechanisms in negatively buoyant electric rays Narcine brasiliensis
... Unlike most batoid fishes, electric rays neither oscillate nor undulate their body disc to generate thrust. Instead they use body–caudal–fin (BCF) locomotion. In addition, these negatively buoyant rays perform unpowered ...
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Strouhal numbers and optimization of swimming by odontocete cetaceans
... 1961) referred to this proportionality as the ‘fish’ constant and hypothesized that it was nearly the same for fish and dolphins. A similar conclusion, but through more rigorous theoretical analysis and detailed ...
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Sound Source Measurement of a Semi Circular Cylinder in a Uniform Flow by Particle Image Velocimetry
... The sound spectrum of the semi-circular cylinder was measured using a microphone with a diameter of 12.7 mm, which was located over the cylinder at a vertical distance of 500 mm. Figure 3 shows the sound spectrum of the ...
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Decay of Pressure Fluctuation in the Hyporheic Zone around a Cylinder
... Notation The following symbols are used in this paper: Prms root mean square of pressure fluctuation St Strouhal Number U stream wise velocity Uc critical velocity for particle entrainme[r] ...
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Aerodynamic characteristics of the wings and body of a dragonfly
... AZUMA area of the test section of the wind-tunnel Strouhal number =nd/U thickness speed of turbulent component of the flow velocity wind speed or flow speed flight speed plus beating spe[r] ...
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Jet Flapping Control with Acoustic Excitation
... The main objective of the present paper is to examine experimentally the effect of excitation Strouhal number based on the excitation frequency and a mean jet velocity on the jet flapping motion. We ...
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Nonlinear oscillatory rarefied gas flow inside a rectangular cavity
... the Strouhal number increases, the damping force first increases to a local maximum, then decreases to a local minimum, and finally increases toward the limiting value of 1/ √ π; see ...
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Wing beat kinematics of a nectar feeding bat, Glossophaga soricina, flying at different flight speeds and Strouhal numbers
... number (St=f ⫻ ⫻ amplitude/V), a dimensionless parameter describing oscillating flow mechanisms and being a predictor of the unsteadiness of the flow, decreases with the speed as St ⬀ ⬀ V –1.37 . Close to the ...
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Fish foot prints: morphology and energetics of the wake behind a continuously swimming mullet (Chelon labrosus Risso)
... thrust power radius of the vortex ring radius of the vortex core Strouhal number duration of the tailbeat cycle swimming speed of the fish flow velocity component parallel to the x′-axis[r] ...
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Numerical Investigation of Velocity and Pressure Fluctuations in the Wake of a Circular Cylinder Due To Transient Laminar Flow
... Flow around a bluff body creates a large region of separated flow and a massive unsteady wake region in the downstream when compared to a streamlined body. Due to the adverse pressure gradient in the flow direction, flow ...
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Strangely behaving fluidic oscillator
... categories. Strouhal number is not constant and yet the frequency is flow-rate ...differential Strouhal number constancy may provide a clue, but there is the unexplained quite high frequency ...
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Active control of flow around a square prism by slot jet injection
... side surfaces were obtained as about 80% at IR = 1.5 and 75% at IR = 2. The rapid changes in flow characteristics may be a consequence of changes in flow structure. In order to reveal this, flow visualization was carried ...
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