Skip to main content Accessibility help
×
Home

Stabilization of a swept-wing boundary layer by distributed roughness elements

  • Seyed M. Hosseini (a1), David Tempelmann (a1), Ardeshir Hanifi (a1) (a2) and Dan S. Henningson (a1)

Abstract

The stabilization of a swept-wing boundary layer by distributed surface roughness elements is studied by performing direct numerical simulations. The configuration resembles experiments studied by Saric and coworkers at Arizona State University, who employed this control method in order to delay transition. An array of cylindrical roughness elements are placed near the leading edge to excite subcritical cross-flow modes. Subcritical refers to the modes that are not critical with respect to transition. Their amplification to nonlinear amplitudes modifies the base flow such that the most unstable cross-flow mode and secondary instabilities are damped, resulting in downstream shift of the transition location. The experiments by Saric and coworkers were performed at low levels of free stream turbulence, and the boundary layer was therefore dominated by stationary cross-flow disturbances. Here, we consider a more complex disturbance field, which comprises both steady and unsteady instabilities of similar amplitudes. It is demonstrated that the control is robust with respect to complex disturbance fields as transition is shifted from 45 to 65 % chord.

Copyright

Corresponding author

Email address for correspondence: ardeshir.hanifi@foi.se

References

Hide All
Bippes, H. 1999 Basic experiments on transition in three-dimensional boundary layers dominated by cross-flow instability. Prog. Aerosp. Sci. 35, 363412.
Carpenter, A., Saric, W. S. & Reed, H. L. 2008 Laminar flow control on a swept wing with distributed roughness. AIAA Paper 2008-7335.
Deyhle, H. & Bippes, H. 1996 Disturbance growth in an unstable three-dimensional boundary layer and its dependence on environmental conditions. J. Fluid Mech. 316, 73113.
Fischer, P. F., Lottes, J. W. & Kerkemeier, S. G. 2008 nek5000 web page. http://nek5000.mcs.anl.gov.
Högberg, M. & Henningson, D. 1998 Secondary instability of cross-flow vortices in Falkner–Skan–Cooke boundary layers. J. Fluid Mech. 368, 339357.
Li, F., Choudhari, M., Chang, C.-L., Streett, C. & Carpenter, M. 2009 Roughness based cross-flow transition control: a computational assessment. AIAA Paper 2009-4105.
Malik, M. R., Li, F., Choudhari, M. M. & Chang, C.-L. 1999 Secondary instability of cross-flow vortices and swept-wing boundary-layer transition. J. Fluid Mech. 399, 85115.
Patera, A. T. 1984 A spectral element method for fluid dynamics: laminar flow in a channel expansion. J. Comput. Phys. 54, 468488.
Reibert, M. S., Saric, W. S., Carillo, R. B. & Chapman, K. L. 1996 Experiments in nonlinear saturation of stationary cross-flow vortices in a swept-wing boundary layer. AIAA Paper 96-0184.
Sakov, P. 2011 gridgen-c – an orthogonal grid generator based on the crdt algorithm (by conformal mapping). http://code.google.com/p/gridgen-c/.
Saric, W. S. Jr., Carillo, R. B. & Reibert, M. S. 1998 Leading-edge roughness as a transition control mechanism. AIAA Paper 98-0781.
Saric, W. S., Reed, H. L. & White, E. B. 2003 Stability and transition of three-dimensional boundary layers. Annu. Rev. Fluid Mech. 35, 413440.
Schrader, L. U., Brandt, L. & Henningson, D. S. 2009 Receptivity mechanisms in three-dimensional boundary layer flows. J. Fluid Mech. 618, 209241.
Somers, D. M. & Horstmann, K.-H. 1985 Design of a medium-speed, natural laminar-flow airfoil for commuter aircraft applications. Tech. Rep. DLR-IB 129-85/26.
Tempelmann, D. 2011 Receptivity of cross flow-dominated boundary layers. PhD thesis, KTH, Stockholm.
Tempelmann, D., Schrader, L.-U., Hanifi, A., Brandt, L. & Henningson, D. S. 2012 Swept wing boundary-layer receptivity to localized surface roughness. J. Fluid Mech. 711, 516544.
Tufo, H. M. & Fischer, P. F. 2001 Fast parallel direct solvers for coarse grid problems. J. Parallel Distrib. Comput. 61 (2), 151177.
Wassermann, P. & Kloker, M. 2002 Mechanics and passive control of cross-flow-vortex-induced transition in a three-dimensional boundary layer. J. Fluid Mech. 456, 4984.
Wassermann, P. & Kloker, M. 2003 Transition mechanisms induced by travelling cross-flow vortices in a three-dimensional boundary layer. J. Fluid Mech. 483, 6789.
White, E. B. & Saric, W. S. 2005 Secondary instability of cross-flow vortices. J. Fluid Mech. 525, 275308.
MathJax
MathJax is a JavaScript display engine for mathematics. For more information see http://www.mathjax.org.

JFM classification

Stabilization of a swept-wing boundary layer by distributed roughness elements

  • Seyed M. Hosseini (a1), David Tempelmann (a1), Ardeshir Hanifi (a1) (a2) and Dan S. Henningson (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed