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 Dynamic responses of anchored ducted flames to harmonic velocity forcing

2017 ◽  
Vol 10 (1) ◽  
pp. 72-85
Author(s):  
Ze-tian Ren ◽  
Su-hui Li ◽  
Min Zhu
Keyword(s):  
Large Scale ◽  
Bluff Body ◽  
Flow Instability ◽  
Low Frequency ◽  
Vortex Method ◽  
Vortex Structures ◽  
Dynamic Responses ◽  
Discrete Vortex ◽  
Flame Response ◽  
Complicated Geometries

This paper aims at developing a computationally inexpensive method to investigate the premixed flame instabilities. The kinematic G-equation is combined with a two-dimensional discrete vortex method, and the conformal mapping is applied to make calculations for complicated geometries more efficiently. The vortex dynamics and flame response to harmonic velocity forcing of an anchored ducted V-flame are investigated, and the effects of harmonic forcing, Reynolds number, and bluff body geometry are examined. Results show that the vortex structures, flow instability, and flame response are closely coupled with each other. The unsteady vortex structures generate instabilities at the flame base, and the convection of the flame wrinkles then influences the flame dynamics downstream. The flame heat release fluctuates with larger amplitude under low-frequency forcings, while the phase of the flame transfer function is quasi-linear with increasing forcing frequency. Both higher inflow velocity and sharper bluff body corners can result in more unsteady large-scale vortex structures and hence influence the flame responses.

Impulsively-Started Flow About Four Types of Bluff Body

1982 ◽  
Vol 104 (2) ◽  
pp. 207-213 ◽  
Author(s):  
T. Sarpkaya ◽  
H. K. Kline
Keyword(s):  
Numerical Analysis ◽  
Circular Cylinder ◽  
Bluff Body ◽  
Discrete Vortex

Measurement of the forces acting on a circular cylinder and those on three other noncircular cylinders is reported. The results confirm and quantify the profound effects of the shedding of the first two or three vortices on all the characteristics of resistance and demonstrate that the evolution of the flow, and hence the forces, significantly depend on whether the separation points are fixed or mobile, or a combination thereof. The data are expected to form the basis of future numerical analysis based on refined discrete vortex models.

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
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