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Jens Fransson

Professor
Phone: +46 8 790 6193
Fax: +46 8 790 7654
E-mail: jensf@mech.kth.se
WWW: Personal Homepage
Room: 5302 Teknikringen 8

Education

  • Master of Science Degree in Engineering Physics (sv. civ. ing. Teknisk Fysik) 1999 at KTH
  • Teknologie Licentiate 2001, KTH Mechanics
  • Teknologie Doctor 2004, KTH Mechanics
  • Docent in Fluid Physics in 2007

Professional History

  • PhD student 1999-2004, KTH Mechanics
  • Research Associate (sv. Forskarassistent), KTH Mechancis, 2004-2008
  • Associate Professor, KTH Mechanics, 2009-2013
  • Professor, KTH Mechanics, 2013-

Research and Professional Activities

Research on:

  • Boundary layer transition to turbulence
  • Control of boundary layer transition
  • Flow control of wakes behind bluff bodies
  • Separation control

Teaching Activity

Leader for the following list of courses.
For the complete list of courses at mechanics, see Courses .

CourseProg.TitleKTH Info
SG2215 All Compressible Flow SG2215
SG2221 All Wave Motions and Hydrodynamic Stability SG2221

Publications

Please note that this list might not be complete. Follow each article link for additional authors.

YearTitle
2017On the scaling of turbulent asymptotic suction boundary layers
10th International Symposium on Turbulence and Shear Flow Phenomena (TSFP-10)   (Published)
2017On the turbulent boundary layer with wall suction
Progress in Turbulence VII, Proc. iTi Conference in Turbulence, Sept. 7-9, 2016, Bertinoro, Italy   (Published)
2016Evaluation of miniature vortex generators for flow control in Falkner–Skan boundary layers
54th AIAA Aerospace Sciences Meeting, 4-8 January 2016, San Diego, California, USA AIAA 2016-2067 1-20 (Published)
2015Stagnation Line Adjustment in Flat-Plate Experiments via Test-Section Venting
AIAA Journal 53 pp. 1112-1116 (Published)
2015Skin-friction drag reduction using the method of spanwise mean velocity gradient
Proc. 9th Turbulence Shear Flow Phenomena (TSFP-9), June 30 - July 3, 2015, The University of Melbourne, Australia   (Published)
2015Stability analysis of the flow past miniature vortex generators in a Blasius boundary layer
86th Annual Meeting of the International Association of Applied Mathematics and Mechanics, Lecce Italy, March 23-27   (Published)
2015Recent progress using the AFRODITE flow control strategy
European Drag Reduction and Flow Control Meeting – EDRFCM 2015, March 23-26, Cambridge, UK   (Published)
2015The Achilles' heel of miniature vortex generators as passive flow control devices for transition delay
Proc. of the Int. Conf. on Jets, Wakes and Separated Flows, ICJWSF-2015, June 15-18, 2015, KTH Stockholm, Sweden.    (Published)
2015An experimental study on the relation between the wake inlet conditions and the near wake topology
Proc. of the Int. Conf. on Jets, Wakes and Separated Flows, ICJWSF-2015, June 15-18, 2015, KTH Stockholm, Sweden.    (Published)
2015On the scaling of streamwise streaks and their efficiency to attenuate Tollmien–Schlichting waves
Exp. Fluids 56 58 (Published)
2015Boundary layer stabilization using free-stream vortices
J. Fluid Mech. 764 R2 (Published)
2014Tollmien-Schlichting wave growth over spanwise-periodic surface patterns
Journal of Fluid Mechanics 754 39-74 (Published)
2014Flow around a rectangular forebody with modified inlet conditions
67th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 23–25, 2014, San Francisco, CA.    (Published)
2014Velocity streaks in a Blasius boundary layer induced by external streamwise vortices: numerical simulation and linear stability analysis
67th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 23–25, 2014, San Francisco, CA.    (Published)
2014Utilization of transient growth disturbances for drag reduction in boundary layers
67th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 23–25, 2014, San Francisco, CA.    (Published)
2014Reinforcement of steady streamwise streaks for consecutive transition delay
67th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 23–25, 2014, San Francisco, CA.    (Published)
2014Stability analysis of the experimental and the simulated flow past miniature vortex generators in a Blasius Boundary layer
67th Annual Meeting of the APS Division of Fluid Dynamics, Nov. 23–25, 2014, San Francisco, CA.    (Published)
2014Transition to turbulence delay using miniature vortex generators – AFRODITE –
Progress in Turbulence and Wind Energy IV, Springer Proceedings in Physics, Proceedings of the iTi Conference in Turbulence 2010 149 65. DOI: 10.1007/978-3-319-01860-7_12 (Published)
2014Numerical investigation of the AFRODITE transition control strategy
Progress in Turbulence III, Springer Proceedings in Physics, Proceedings of the iTi Conference in Turbulence 2008 149 65. DOI: 10.1007/978-3-319-01860-7_12 (Published)
2014Passive boundary layer control of oblique disturbances by finite-amplitude streaks
J. Fluid Mech. 749 1-36 (Published)
2014Consecutive turbulence transition delay with reinforced passive control
Physical Review E 89 061001(R) (Published)
2014Experimental investigation on the steady and unsteady disturbances in a flat plate boundary layer
Phys. Fluids 26 124103 (Published)
2014Minimum-Turbulence-Level wind tunnel at KTH
The Japan Society of Fluid Mechanics, NAGARE 33 253-258 (Published)
2014Boundary layer modification by means of wall suction and the effect on the wake behind a rectangular forebody
Phys. Fluids 26 125105 (Published)
2013Scaling laws in canopy flows: a wind-tunnel analysis
Boundary-Layer Meteorol. 148 269-283 (Published)
2013Experimental study on the effect of pulsating inflow to an enclosure for improved mixing
Int. J. Heat and Fluid Flow   (Accepted)
2013Patterned surface roughness for passive transition delay
Bulletin of the American Physical Society 58  (Published)
2013Transition delay by introducing spanwise velocity gradients
66th Annual Meeting of the APS Division of Fluid Dynamics, November 24–26, 2013, Pitsburgh, Pennsylvania, USA   (Published)
2013Obtaining accurate mean velocity measurements in high Reynolds number turbulent boundary layers using Pitot probes
J. Fluid Mech. 715 642-670 (Published)
2013Stability analysis of experimental flow fields behind a porous cylinder for the investigation of the large-scale wake vortices
J. Fluid Mech. 715 599-536 (Published)
2013The stability and development of tip and root vortices behind a model wind turbine
Experiments in fluids 54 1591 (Published)
2013Scaling of streamwise boundary layer streaks and their ability to reduce skin-friction drag
J. Fluid Mech. 733 1-32 (Published)
2012On stabilization of Tollmien-Schlichting waves by means of streamwise streaks: AFRODITE
Joint ERCOFTAC/PLASMAERO Workshop, Dec. 10-12, Toulouse, France.   (Published)
2012Scaling analysis of streamwise boundary layer streaks: AFRODITE
Joint ERCOFTAC/PLASMAERO Workshop, Dec. 10-12, Toulouse, France.   (Published)
2012Skin-friction drag reduction using passive flow control: AFRODITE
Joint ERCOFTAC/PLASMAERO Workshop, Dec. 10-12, Toulouse, France.   (Published)
2012Miniature vortex generators for transition delay
9th Eur. Fluid Mech. Conf. EFMC9, 9-13 September, University of Rome "Tor Vergata"   (Published)
2012On the scaling of steady streamwise boundary layer streaks
9th Eur. Fluid Mech. Conf. EFMC9, 9-13 September, University of Rome "Tor Vergata"   (Published)
2012On the generation of steady streamwise streaks in flat plate boundary layers
J. Fluid Mech. 698 211-234 (Published)
2012Revival of Classical Vortex Generators Now for Transition Delay
Physical Review Letters 109  (Published)
2011Advanced Fluid Research On Drag reduction In Turbulence Experiments - AFRODITE
Proc. of 13th European Turbulence Conference (ETC 13), Poland (Journal of Physics: Conference Series) 318 032007 (Published)
2011Measurements in a bluff body wake with variable inlet conditions
Bulletin of the American Physical Society, 64th Annual Meeting of the APS Division of Fluid Dynamics, Baltimore, November 20-22 2011   (Published)
2011Natural by-pass boundary layer transition
Bulletin of the American Physical Society, 64th Annual Meeting of the APS Division of Fluid Dynamics, Baltimore, November 20-22 2011   (Published)
2011Stability and sensitivity analysis of experimental flow fields measured past a porous cylinder
Bulletin of the American Physical Society, 64th Annual Meeting of the APS Division of Fluid Dynamics, Baltimore, November 20-22 2011   (Published)
2011Transient growth in the asymptotic suction boundary layerExp.
Expriments in Fluids 51 771-784 (Published)
2011Boundary layer receptivity to free-stream turbulence and surface roughness over a swept flat plate
Physics of Fluids 23 034107-1 (Unknown)
2011An experimental study on wake evolution and trailing vortex instabilities
Proceedings of Wake Conference, Visby, June 8-10 2011   (Published)
2011An experimental study on tip vortex instabilities and breakdown
Svenska mekanikdagarna, Göteborg, June 13-15 2011   (Published)
2011High amplitude streaks in boundary layers: a new passive mechanism for transition delay
4th European Conference for Aerospace Sciences Saint Petersburg, Russia, July 4, 2011 – July 8, 2011 2 1-10 (Published)
2011Advanced Fluid Research On Drag reduction in Turbulence Experiments - AFRODITE-
Svenska mekanikdagarna, Göteborg, June 13-15 2011 1 75 (Published)
2011Experiments on a bluff body wake with varying inlet conditions
Svenska mekanikdagarna, Göteborg, June 13-15 2011 1 73 (Published)
2011Transition delay by means of base flow modulations
Svenska mekanikdagarna, Göteborg, June 13-15 2011 1 36 (Published)
2011Free-stream turbulence boundary layer transition
Svenska mekanikdagarna, Göteborg, June 13-15 2011 1 38 (Published)
2011Gust structure and generation in canopy flows
EWEA conference, Brussels, Belgium, March 14-17 2011   (Unknown)
2011An experimental analysis of canopy flows
Proc. of 13th European Turbulence Conference (ETC 13), Poland (Journal of Physics: Conference Series)   (Accepted)
2011Wake evolution and trailing vortex instabilities
Bulletin of the American Physical Society, 64th Annual Meeting of the APS Division of Fluid Dynamics, Baltimore, November 20-22 2011   (Accepted)
2011PIV Visualisation study in a two-dimensional room model with rapid time varying ventilation flow rates
ROOMVENT The 12th International Conference on Air Distribution in Rooms, June. 19-22, Trondheim.   (Published)
2011Effect of free-stream turbulence characteristics on boundary layer transition
Proc. of 13th European Turbulence Conference (ETC 13), Poland (Journal of Physics: Conference Series) 318 032019 (Published)
2011Base flow modulations for skin-friction drag reduction
Proc. of 13th European Turbulence Conference (ETC 13), Poland (Journal of Physics: Conference Series) 318 032008 (Published)
2011Transition delay by means of base flow modulations
Bulletin of the American Physical Society, 64th Annual Meeting of the APS Division of Fluid Dynamics, Baltimore, November 20-22 2011   (Published)
2011Advanced Fluid Research On Drag reduction In Turbulence Experiments - AFRODITE
Bulletin of the American Physical Society, 64th Annual Meeting of the APS Division of Fluid Dynamics, Baltimore, November 20-22 2011   (Published)
2010Experimental investigation of the wake instability behind a rectangular-based forebody
6th IUTAM Symposium on Bluff Body Wakes and Vortex-Induced Vibrations, June 22-25, 2010, Capri Island, Italy.   (Accepted)
2010Optimization and control of wind farms: Tip vortex breakdown and wake flow interaction
Poster presentation, Vindkraftsforskning i fokus, Göteborg, November 24-25 2010   (Published)
2010On near wall measurements of wall bounded flows—The necessity of an accurate determination of the wall position
Prog. Aerosp. Sci. 46 353-387 (Published)
2010Turbulent spot evolution in spatially invariant boundary layers
Phys. Rev. E. 81 035301-1 (Published)
2010Experimental investigation of the influence of inlet conditions to a bluff body wake
Bulletin of the American Physical Society, 63rd Annual Meeting of the APS Division of Fluid Dynamics, November 21–23, 2010, Long Beach, California   (Published)
2010Evolution Of Traveling Crossflow Modes Over A Swept Flat Plate
Proceedings of the Seventh IUTAM Symposium on Laminar-Turbulent Transition, Stockholm, Sweden, 2009  231-236 (Published)
2010High amplitude steady streaks in flat plate boundary layers
40th AIAA Fluid Dynamics Conference and Exhibit. Chicago, Illinois, USA. 28 June - 1 July 2010 15 1-14 (Published)
2009Evolution of Traveling Crossflow Modes over a Swept Flat Plate
Proceedings of the Seventh IUTAM Symposium on Laminar-Turbulent Transition, Stockholm, Sweden, 2009 18  (Published)
2009Experimental investigation of turbulent patch evolution in spatially steady boundary layers
Advances in Turbulence XII, Proc. 12th EUROMECH ETC, Sept. 7-10, 2009, Marburg, Germany   (Published)
2009The diagnostic plot - a new way to appraise turbulent boundary layer data
Advances in Turbulence XII, Springer Proceedings in Physics 132 609-612 (Published)
2009CICLoPE - a response to the need for high Reynolds number experiments
Fluid Dynamics Research 41  021407 (Published)
2009Grid generated turbulence revisited
Fluid Dynamics Research 41 021403 (Published)
2009Streamwise evolution of longitudinal vortices in a turbulent boundary layer
J. Fluid Mech. 623 27-58 (Published)
2009Turbulent boundary layers up to Re_\theta=2500 studied through simulation and experiment
Physics of Fluids 21 051702 (Published)
2009On imperfect hot-wire resolution issues and their effect on mean quantities
Advances in Turbulence XII, Springer Proceedings in Physics 132 605-608 (Published)
2009New results on grid-generated turbulence
Advances in Turbulence XII, Proc. 12th EUROMECH ETC, Sept. 7-10, 2009, Marburg, Germany   (Published)
2009Turbulence Measurements with Hot Wires in High Reynolds Number Boundary Layers
Bulletin of the American Physical Society, 62nd Annual Meeting of the APS Division of Fluid Dynamics, Volume 54, Number 19, Sunday–Tuesday, November 22–24, 2009, Minneapolis, Minnesota  54 21 (Published)
2009Transition to turbulence delay by means of a passive mechanism
CEAS/KATnet II Conference on Key Aerodynamic Technologies, 12-15 May 2009, Bremen 1  (Published)
2009Vortex statistics in a bluff body wake with varying inlet conditions
Bulletin of the American Physical Society, 62nd Annual Meeting of the APS Division of Fluid Dynamics, Volume 54, Number 19, Sunday–Tuesday, November 22–24, 2009, Minneapolis, Minnesota  54 (19) 125 (Published)
2008Shear effect on pressure and particle acceleration in high-Reynolds-number turbulence
Proceedings of the IUTAM Symposium on Computational Physics and New Perspectives in Turbulence, Nagoya University, Nagoya, Japan, September, 11-14, 2006. Part II. Kaneda, Yukio (Ed.) 2008, Springer.   (Published)
2008Experimental study of turbulent spot evolution in the ASBL
7th Eur. Fluid Mech. Conf. EFMC7, Manchester, 14-18 Sept. 2008.  104 (Published)
2008Vortex analysis in the near wake behind a porous cylinder subject to blowing or suction
7th Eur. Fluid Mech. Conf. EFMC7, Manchester, 14-18 Sept. 2008.  96 (Published)
2008Effect of surface roughness and FST on crossflow instability
7th Eur. Fluid Mech. Conf. EFMC7, Manchester, 14-18 Sept. 2008.  181 (Published)
2008Turbulent spot evolution in the ASBL
61rd Meeting of the APS Division of Fluid Dynamics, Nov. 23-25, San Antonio, TX, USA. Abstract in Bull. Am. Phys. Soc.  62 (Published)
2008Wake flow manipulation by means of blowing and suction
Proc. XXII ICTAM, 25--29 August 2008, Adelaide, Australia  128 (Published)
2008Experimental determination of the aero-acoustic properties of an in-duct flexible plate
AIAA-2008-3057, 14th AIAA/CEAS Aeroacoustic Conference, Vancouver, Canada, May 5-7, 2008.   (Unknown)
2008Effect of surface roughness and FST on crossflow instability
7th Eur. Fluid Mech. Conf. EFMC7, Manchester, 14-18 Sept. 2008.   (Published)
2007Pressure statistics and their scaling in high-Reynolds-number turbulent boundary layers
J. Fluid Mech. 585 1-40 (Published)
2007Research on the interaction between streamwise streaks and Tollmien–Schlichting waves at KTH
ERCOFTAC Bulletin 74 37-43 (Published)
2007Transient growth in the asymptotic suction boundary layer
60th Meeting of the APS Division of Fluid Dynamics, Nov 18–20, Salt Lake City (UT), USA. Abstract in Bull. Am. Phys. Soc.   (Published)
2006Experimental study of the stabilization of Tollmien-Schlichting waves by finite amplitude streaks
Laminar-Turbulent Transition, Proc. IUTAM Symp., Bangalore, Dec. 13-17. 2004. Ed. Rama Govindarajan, Springer,   p. 299-304 (Published)
2006Using non-normality for passive laminar flow control
Proceedings of the 14th European Conference on Mathematics for Industry, Leganés, Madrid, Spain, July 10-14.   (Published)
2006Transition delay by roughness elements
Whither Turbulence Prediction and Control. March 26-29, Seoul National University, Seoul, Korea.    (Published)
2006Vortical structures generated by a time varying jet flow in a ventilated enclosure
6th Euromech Fluid Mech. Conf., June 26-30, 2006. 2 315 (Published)
2006Delaying transition to turbulence by a passive mechanism
6th Euromech Fluid Mech. Conf., June 26-30, 2006. 2 360 (Published)
2006Delaying transition to turbulence by a passive mechanism
Physical Review Letters 96 064501 (Published)
2006Experimental analysis of transition delay by means of roughness elements
AIAA-06-3528, 36th AIAA Fluid Dynamics Conference and Exhibit, June 5-8, San Francisco   (Published)
2005Stabilization of Tollmien Schlichting waves by means of roughness generated streaks
Proc. 18th AIDAA 2005   (Published)
2005Pressure statistics in high-Reynolds number turbulent boundary
Turbulence and Shear Flow Phenomena - 4   (Published)
2005Transition induced by free stream turbulence
J. Fluid Mech. 527 1-25 (Published)
2005Experimental study of the stabilization of Tollmien-Schlichting waves by finite amplitude streaks
Phys. Fluids 17 (5) 054110 (Published)
2005Transition delay by means of a passive mechanism
58th Meeting of the APS Division of Fluid Dynamics, Nov. 20-22, Chicago (IL), USA. Abstract in Bull. Am. Phys. Soc. 50  (Published)
2004Leading edge design process using a commercial flow solver
Exp. in Fluids 37 929-932 (Published)
2004Flow around a porous cylinder subject to continuous suction or blowing
J. Fluid. Struct. 19 1031-1048 (Published)
2004Free stream turbulence induced disturbances in boundary layers with wall suction
Phys. Fluids 16 3530-3539 (Published)
2004Experimental and theoretical investigation of the non-modal growth of steady streaks in a flat plate boundary layer
Phys. Fluids 16 3627-3638 (Published)
2003Optimal linear growth in the asymptotic suction boundary layer
Eur. J. Mech./Fluids 22/3 259-270 (Published)
2003On the disturbance growth in an asymptotic suction boundary layers
J. Fluid Mech. 482 51-90 (Published)
2003On the hydrodynamic stability of channel flow with cross flow
Phys. Fluids 15 436-441 (Published)
2003Experimental analysis of the evolution of steady disturbances in a flat plate boundary layer
In Atti del XVII Congresso Nazionale dell'Associazione Italiana di Aeronautica e Astronautica. Rome, Italy, Sept. 15-19.   (Published)
2003Evolution of disturbances in boundary layers with wall suction
Turbulence and Shear Flow Phenomena - 3 1 489-494 (Published)
2003Experimental analysis of the evolution of steady disturbances in a flat plate boundary layer
Proc. 17th AIDAA 2003   (Published)
2003Stabilisation of Tollmien-Schlichting waves by streaky base flow
56th Meeting of the APS Division of Fluid Dynamics, Nov. 23-25, East Rutherford (NJ), USA. Abstract in Bull. Am. Phys. Soc. 48  (Published)
2002Error in hot-wire X-probe measurements induced by unsteady velocity gradients
Expriments in Fluids 32 413-415 (Published)
2001Free stream turbulence induced disturbances in a uniform suction boundary layer
Turbulence and Shear Flow Phenomena - 2 1 353-358 (Published)
2000Growth and breakdown of streaky structures in boundary layer transition induced by free stream turbulence
Laminar-Turbulent Transition, Proc. IUTAM Symp., Sedona, Sept. 13-17. 1999. Eds Fasel H.F. & Saric W.S., Springer  371-376 (Published)
2000Free stream turbulence induced disturbances in a uniform suction boundary layer
53rd Meeting of the APS Division of Fluid Dynamics, Nov. 19-21, Washington (D.C.), USA. Abstract in Bull. Am. Phys. Soc. 45  (Published)
Boundary layer stabilization using free-stream vortices
   (Unknown)

Internal Reports

Please note that this list might not be complete.

YearTitleDocument Type
2003Flow control of boundary layers and wakes Doctoral thesis
2001Investigations of the asymptotic suction boundary layer Licentiate thesis

Projects

Please note that this list might not be complete.

PeriodTitleArea
2010-2015AFRODITE - Advanced Fluid Research On Drag reduction In Turbulence ExperimentsFluid mechanics
2005-2011Active control of vortex shedding behind bluff bodiesFluid mechanics
2003-Laminar-Turbulent transition delay by means of passive controlFluid mechanics