Vortex model to define safe aircraft separation distances

An approximate model of wake vortices behavior is presented. We have introduced modifications in the Greene's model to take into account the effects of ground (divergence, rebound) and crosswind (advection, shear). Direct numerical simulations of laminar flows with and without lateral wind are performed to validate these extensions. The first results are encouraging and efforts are carried on to derive a more reliable model. The capability of this model to mimic the reality is shown by comparison with an experimental test case.

[1]  F. Köpp.  Doppler lidar investigation of wake vortex transport between closely spaced parallel runways , 1994 .

[2]  Frédéric Risso,et al.  Direct numerical simulation of trailing vortices in homogeneous turbulence , 1996 .

[3]  Ivar Tombach,et al.  Observations of Atmospheric Effects on Vortex Wake Behavior , 1973 .

[4]  Alexandre Corjon,et al.  Behavior of Wake Vortices Near Ground , 1997 .

[5]  Thierry Poinsot,et al.  Wake vortices behavior near the ground , 1996 .

[6]  S. Crow.  Stability theory for a pair of trailing vortices , 1970 .

[7]  F. J. Perry,et al.  Flowfield produced by trailing vortices in the vicinity of the ground , 1971 .

[8]  Coleman duP. Donaldson,et al.  Vortex Wakes of Conventional Aircraft , 1975 .

[9]  R. Krasny.  A study of singularity formation in a vortex sheet by the point-vortex approximation , 1986, Journal of Fluid Mechanics.

[10]  Turgut Sarpkaya,et al.  Trailing vortices in homogeneous and density-stratified media , 1983, Journal of Fluid Mechanics.

[11]  M. E. Teske,et al.  Neutral Atmospheric Effects on the Dissipation of Aircraft Vortex Wakes , 1978 .

[12]  J. D. Iversen,et al.  Correlation of turbulent trailing vortex decay data , 1976 .

[13]  Paolo Orlandi,et al.  Vortex dipole rebound from a wall , 1990 .

[14]  Leo J. Garodz,et al.  VORTEX WAKE CHARACTERISTICS OF B757-200 AND B767-200 AIRCRAFT USING THE TOWER FLY-BY TECHNIQUE. , 1993 .

[15]  T. Poinsot.  Boundary conditions for direct simulations of compressible viscous flows , 1992 .

[16]  P. G. Saffman.  The approach of a vortex pair to a plane surface in inviscid fluid , 1979 .

[17]  Robert L. Ash,et al.  Viscous effects on a vortex wake in ground effect , 1992 .

[18]  S. Lele.  Compact finite difference schemes with spectral-like resolution , 1992 .

[19]  G. C. Greene,et al.  An approximate model of vortex decay in the atmosphere , 1985 .

[20]  Robert Krasny,et al.  Computation of vortex sheet roll-up in the Trefftz plane , 1987, Journal of Fluid Mechanics.