Large eddy simulation of the near wake of a rectangular wing

Youssef, Khaled; Ragab, Saad A.; Devenport, William J.; Abde, A.

doi:10.2514/6.1998-317

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…The RANS and URANS numerical models predicted fluctuating rms velocities that were orders of magnitude less than experiment (≈ 10 −6 ) and could not be represented legibly on graphs or plots. Churchfield and Blaisdell (2009) • and α = 10 • , which was similar to the LES study by Youssef et al (1998).…”

Section: Numerical Modelling Of a Wing-tip Vortexsupporting

confidence: 68%

“…The turbulence inside the primary tip vortex was not created by the vortex itself but by the turbulent shear layer and interaction between the primary and secondary vortex structures (similar to the experimental study by Devenport et al (1996)). An earlier LES study by Youssef et al (1998) also found that large scale structures of the spiral wake were responsible for the formation of turbulent fluctuations in the vortex core. Another relatively new technique in the numerical simulation of wing-tip vortices is the concept of vorticity confinement, which was developed by Steinhoff and his co-workers at the University of Tennessee (Hu et al, 2000;Kimbrell, 2012;Lynn, 2007;Steinhoff et al, 2005).…”

Section: Literature Reviewmentioning

confidence: 97%

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Numerical and experimental investigation of the mean and turbulent characteristics of a wing-tip vortex in the near field

O’Regan

Griffin

Young

2014

Proceedings of the Institution of Mechanical Engineers, Part G:

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Section: Numerical Modelling Of a Wing-tip Vortexsupporting

confidence: 68%

Section: Literature Reviewmentioning

confidence: 97%

Numerical and experimental investigation of the mean and turbulent characteristics of a wing-tip vortex in the near field

O’Regan

Griffin

Young

2014

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…While wandering is not a dominant contributor to u 2 , the large values of this stress inside the cores do not necessarily indicate intense turbulent mixing. As suggested by DLRF and DZV and confirmed by Youssef et al (1998), velocity fluctuations in the core may result from inactive motions as it is buffeted by surrounding turbulence. The various contributions to the velocity fluctuations measured in and around the vortex cores may be distinguished to a degree by examining velocity spectra.…”

Section: -3mentioning

confidence: 68%

Flow structure produced by the interaction and merger of a pair of co-rotating wing-tip vortices

1999

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Experiments have been performed to study the co-rotating wing-tip vortex pair produced by a pair of rectangular wings in a split-wing configuration. Detailed measurements made in cross-sections upstream and downstream of merger reveal, for the first time, the complex turbulence structure of this flow. The vortices spiral around each other and merge some 20 chordlengths downstream of the wings. As merger is approached the vortices lose their axisymmetry – their cores develop lopsided tangential velocity fields and the mean vorticity field is convected into filaments. The cores also become part of a single turbulence structure dominated by a braid of high turbulence levels that links them together. The braid, which quite closely resembles the structure formed between adjacent spanwise eddies of transitional mixing layers, grows in intensity with downstream distance and extends into the vortex cores. Unlike a single tip vortex, the unmerged cores appear turbulent.The merging of the vortices wraps the cores and the flow structure that surrounds them into a large turbulent region with an intricate double spiral structure. This structure then relaxes to a closely axisymmetric state. The merged core appears stable and develops a structure similar to the laminar core of a vortex shed from a single wing. However, the turbulent region formed around the vortex core during the merger process is much larger and more axisymmetric than that found around a single wing-tip vortex.

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Large-eddy simulation of wing tip vortex in the near field

Jiang

Cai

Liu

2008

International Journal of Computational Fluid Dynamics

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Large eddy simulation with filtered-structure-function subgrid model and implicit large eddy simulation (ILES without explicit subgrid model) using high-order accuracy and high resolution compact scheme have been performed on the tip vortex shedding from a rectangular half-wing with a NACA 0012 airfoil section and a rounded wing tip. The formation of the tip vortex and its initial development in the boundary layer and the near field wake are investigated and analyzed in detail. The physics, why the tip vortex, which is originally turbulent in the boundary layer, is re-laminarized and becomes stable and laminar rapidly after shedding in the near field, is revealed by this simulation. The computation also shows the widely used second order subgrid model is not consistent to six-order compact scheme and would degenerate the six-order LES results to second order. Therefore, high order schemes, gird refinement and six order subgrid models are critical to LES approaches.

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Large eddy simulation of the near wake of a rectangular wing

Cited by 10 publications

References 6 publications

Numerical and experimental investigation of the mean and turbulent characteristics of a wing-tip vortex in the near field

Numerical and experimental investigation of the mean and turbulent characteristics of a wing-tip vortex in the near field

Flow structure produced by the interaction and merger of a pair of co-rotating wing-tip vortices

Large-eddy simulation of wing tip vortex in the near field

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