Low-Speed Aerodynamics, Second Edition

Katz, Joseph; Plotkin, Allen

doi:10.1115/1.1669432

Cited by 17 publications

(21 citation statements)

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“…When the foils are vertically separated far enough (RL=2.0C), the wake vortices behind the foils do not interact with each other. The mutual interaction of wake vortices is a function of the distance between the vortices because the induced velocity from the other vortices is proportional to 1/r [18]. The wake patterns in CASE A show the mushroom heads of both upper and lower rows pointing in the same direction, whereas the wake patterns in CASE B show the mushroom heads of the upper and lower rows pointing in the opposite direction with respect to each other.…”

Section: Resultsmentioning

confidence: 97%

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Propulsive characteristics of dual fish-like foils

Han

Lee²

2008

J Mech Sci Technol

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The effect of the vertical and horizontal distances between dual fish-like foils on the propulsive characteristics of the biomimetic propulsor system is investigated by using an unsteady panel method. The present method is validated by comparing computed results with other numerical and experimental data. The mutual vortex-vortex interaction between the shed vortices from both foils has the effect of changing the pointing direction of mushroom heads. The leading foil's propulsive characteristics do not change much with the vertical distance between the foils, whereas the following foil's propulsive characteristics are changed significantly depending on the vertical and horizontal distances between the foils. The overall wake patterns depend mainly on the horizontal distance. The intensity of the mutual interaction between the wake vortices depends on the vertical distance. Thus, the propulsive characteristics of the dual fish-like foils are complicated functions of the vertical and horizontal distances between the foils. The present method has the limitation of potential-low assumption. If the flow separation near the leading edge of the foils is not significant, the present method can be applied to the design of biomimetic propulsors.

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Section: Resultsmentioning

confidence: 97%

“…It is assumed that the viscous effect is confined within a thin boundary layer. Thus, the flow is assumed to be inviscid, incompressible and irrotational over the entire flow field, excluding the foils' boundaries and their wakes [18].…”

Section: Unsteady Panel Methodsmentioning

confidence: 99%

Propulsive characteristics of dual fish-like foils

Han

Lee²

2008

J Mech Sci Technol

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“…The doublet and source strengths are defined as Katz and Plotkin (2001) give more details about the derivation of these expressions. Eq.…”

Section: Unsteady 3d Surface Panel Methodsmentioning

confidence: 99%

“…Adding the external and kinematic velocity contributions, the total local velocity is Q V Ω r v v = − × − + v . The time-dependent pressure, p k , at the kth panel can be estimated from (Katz and Plotkin, 2001) …”

Section: Unsteady 3d Surface Panel Methodsmentioning

confidence: 99%

“…3. According to Katz and Plotkin (2001) and Riziotis and Voutsinas (2008) all the vorticity in the boundary layer is shed into the wake and the tangential velocity just under the wake sheet is zero. In this case the strength of separated vortex can be expressed as where Γ sep j t , , is the circulation strength of the separated wake panel, Γ sep j t −1, , is the circulation strength of the panel just upstream of the separation panel and K is a reduction factor whose recommended value is 0.5 (Katz and Plotkin, 2001).…”

Section: Wake Vorticity Strength Estimationmentioning

confidence: 99%

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