Gust Response of Separated Shear Layers using Discrete Vortex Methods

2006 ◽  
Author(s):  
Nikhil Murgai ◽  
Fred Haan
Keyword(s):  
Shear Layers ◽  
Vortex Methods ◽  
Discrete Vortex ◽  
Gust Response

A numerical study of vortex interaction

1984 ◽  
Vol 146 ◽  
pp. 331-345 ◽  
Author(s):  
I. G. Bromilow ◽  
R. R. Clements
Keyword(s):  
Flow Visualization ◽  
Numerical Study ◽  
Experimental Studies ◽  
Shear Layers ◽  
Controlled Study ◽  
Vortex Interaction ◽  
Flow Conditions ◽  
Discrete Vortex ◽  
Vortex Model ◽  
Discrete Vortex Model

Flow visualization has shown that the interaction of line vortices is a combination of tearing, elongation and rotation, the extent of each depending upon the flow conditions. A discrete-vortex model is used to study the interaction of two and three growing line vortices of different strengths and to assess the suitability of the method for such simulation.Many of the features observed in experimental studies of shear layers are reproduced. The controlled study shows the importance and rapidity of the tearing process under certain conditions.

scholarly journals Parallel discrete vortex methods on commodity supercomputers; an investigation into bluff body far wake behaviour

1999 ◽  
Vol 7 ◽  
pp. 418-428 ◽  
Author(s):  
Kenji Takeda ◽  
Owen R. Tutty ◽  
Denis A. Nicole
Keyword(s):  
Bluff Body ◽  
Vortex Methods ◽  
Discrete Vortex ◽  
Far Wake

scholarly journals Model Reduction in Discrete-Vortex Methods for Unsteady Airfoil Flows

AIAA Journal ◽  
2019 ◽  
Vol 57 (4) ◽  
pp. 1409-1422 ◽  
Author(s):  
ArunVishnu SureshBabu ◽  
Kiran Ramesh ◽  
Ashok Gopalarathnam
Keyword(s):  
Model Reduction ◽  
Vortex Methods ◽  
Discrete Vortex

A contribution to an inviscid vortex-shedding model for an inclined flat plate in uniform flow

1977 ◽  
Vol 82 (2) ◽  
pp. 223-240 ◽  
Author(s):  
Masaru Kiya ◽  
Mikio Arie
Keyword(s):  
Flat Plate ◽  
Vortex Shedding ◽  
Separated Flow ◽  
Flow Patterns ◽  
Shear Layers ◽  
Visualization Technique ◽  
Time Intervals ◽  
Discrete Vortex ◽  
Kutta Condition ◽  
Vorticity Transport

Unsteady separated flow behind an inclined flat plate is numerically studied through the use of the discrete-vortex approximation, in which the shear layers emanating from the edges of the plate are represented by an array of discrete vortices introduced into the flow field at appropriate time intervals at some fixed points near the edges of the plate. The strengths of the nascent vortices are chosen so as to satisfy the Kutta condition at the edges of the plate. Numerical calculations are performed for a plate at 60° incidence impulsively started from rest in an otherwise stationary incompressible fluid, by systematically changing the distance between the location of the nascent vortices and the edges of the plate. The temporal changes in the drag force, the rate of vorticity transport at both edges of the plate and the velocity of the separated shear layers are given together with the flow patterns behind the plate on the basis of this model. The results of the computation show that the vortex street behind the plate inclines as a whole towards the direction of the time-averaged lift force exerted on the plate. It is also predicted from the calculations that the vortex shedding at one edge of the plate will not occur at the mid-interval of the successive vortex shedding at the other edge. The predicted flow patterns are not inconsistent with a few experimental observations based on the flow-visualization technique.

Impulsively Started Steady Flow About Rectangular Prisms: Experiments and Discrete Vortex Analysis

1986 ◽  
Vol 108 (1) ◽  
pp. 47-54 ◽  
Author(s):  
T. Sarpkaya ◽  
C. J. Ihrig
Keyword(s):  
Reynolds Number ◽  
Steady Flow ◽  
Strouhal Number ◽  
Relative Displacement ◽  
Shear Layers ◽  
Discrete Vortex ◽  
Vortex Model ◽  
Vorticity Distribution ◽  
Initial Rise ◽  
Lift And Drag

Impulsively started steady flow about sharp-edged rectangular prisms has been investigated experimentally and numerically. The forces acting on the bodies have been determined at a Reynolds number of about 20,000 for various angles of incidence as a function of the relative displacement of the fluid. The results have shown that the shedding of the first few vortices has profound effects on both the lift and drag coefficients, often resulting in a large initial rise in drag. The surface-vorticity-distribution version of the discrete vortex model has shown that the strength of the vortex clusters varies from 80 to 90 percent of the vorticity generated in the shear layers. The Strouhal number is correctly predicted but the calculated forces are somewhat larger than those measured experimentally.

Tikhonov regularisation in discrete vortex methods

2005 ◽  
Vol 34 (2) ◽  
pp. 275-281
Author(s):  
A. Bouferrouk ◽  
S.I. Chernyshenko
Keyword(s):  
Vortex Methods ◽  
Discrete Vortex ◽  
Tikhonov Regularisation
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