The three-dimensional boundary layer flow due to a rotor-tip vortex

Affes, H.; Xiao, Zhenglu; Conlisk, A. T.; Kim, J.; Komerath, Narayanan

doi:10.2514/6.1993-3081

Cited by 10 publications

(6 citation statements)

References 3 publications

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“…As mentioned in the Introduction, the interaction of the tip vortex shed from a helicopter blade interacts with the airframe and experimental measurement reveals that there are double pressure suction peaks (Affes et al 1993b). The present calculation captures the initial stage of the development of the second suction peak (figures 11, 15 and 16).…”

Section: Results For Interacting Boundary-layer Flowmentioning

confidence: 98%

“…The present work is believed to be the first demonstration of singular behaviour for the case of the fully nonlinear unsteady three-dimensional boundary layer. The secondary motivation of the present work is that the rotorcraft experiments carried out by Professor N. M. Komerath and his colleagues at Georgia Tech indicate that there is a second suction peak in the pressure when the tip vortex impinges on the rotor-craft airframe (Affes et al 1993b). This feature of the pressure distribution is not Figure 1.…”

Section: Introductionmentioning

confidence: 90%

“…To numerically march the tip vortex in time, the vortex filament is broken into M + 1 segments. At any field point the velocity field induced by the vortex line is calculated by the Biot-Savart law with a smoothing parameter (Moore 1972;Affes et al 1993b) which is given by…”

Section: The Inviscid Flowmentioning

confidence: 99%

“…The smoothing parameter is defined by µ = a v e −3/4 where a v is the dimensionless vortex core radius. Here we take a v = 0.11 which is typical of the experiments (Affes et al 1993b). For the time range of interest, in which the vortex is more than one core radius away from the cylinder, the effect of the smoothing parameter µ is negligible (Affes et al 1993a).…”

Section: The Inviscid Flowmentioning

confidence: 99%

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The interacting boundary-layer flow due to a vortex approaching a cylinder

1997

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In this paper the solution to the three-dimensional and unsteady interacting boundary-layer equations for a vortex approaching a cylinder is calculated. The flow is three-dimensional and unsteady. The purpose of this paper is to enhance the understanding of the structure in three-dimensional unsteady boundary-layer separation commonly observed in a high-Reynolds-number flow. The short length scales associated with the boundary-layer eruption process are resolved through an efficient and effective moving adaptive grid procedure. The results of this work suggest that like its two-dimensional counterpart, the three-dimensional unsteady interacting boundary layer also terminates in a singularity at a finite time. Furthermore, the numerical calculations confirm the theoretical analysis of the singular structure in two dimensions for the interacting boundary layer due to Smith (1988).

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Section: Results For Interacting Boundary-layer Flowmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 90%

Section: The Inviscid Flowmentioning

confidence: 99%

Section: The Inviscid Flowmentioning

confidence: 99%

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The interacting boundary-layer flow due to a vortex approaching a cylinder

1997

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“…Since the early eighties, research on this interaction has been steadily increasing. 4,5) have used a three dimensional interacting boundary layer approach to treat the close approach of a vortex to a cylinder, using data from the Georgia Tech model as a starting point. They were able to predict the development of a secondary vortex and correlate its pressure signature with experimental results.…”

Section: Introductionmentioning

confidence: 99%