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UID:0-251@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20230529T133000

DTEND;TZID=Asia/Jerusalem:20230529T143000

DTSTAMP:20230517T112045Z

URL:https://aerospace.technion.ac.il/events/laminar-to-turbulent-transitio
 n-in-airfoil-boundary-layer-flows-at-unsteady-inflow-conditions/

SUMMARY:Laminar-to-turbulent transition in airfoil boundary-layer flows at 
 unsteady inflow conditions
DESCRIPTION:Lecturer:Duncan Ohno\n Faculty:Department of Aerospace Engineer
 ing\n Institute:Technion – Israel Institute of Technology\n Location:Cla
 ssroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: https://techn
 ion.zoom.us/j/97346140543\n Abstract: The presented work was performed at 
 the boundary-layers group of the Institute of Aerodynamics and Gas Dynamic
 s\, Stuttgart:\n\nLaminar-to-turbulent transition in boundary-layer flows 
 on natural laminar flow (NLF) airfoils under oscillating inflow conditions
  is numerically investigated. In the cases studied\, large-scale fluctuati
 ons in the form of periodic vertical gusts generate an oscillating pressur
 e gradient which results in a complex transient behavior of the boundary l
 ayer. Under these conditions\, two scenarios are investigated: an attached
  flow with natural Tollmien-Schlichting (TS) wave transition and a boundar
 y-layer flow featuring a laminar separation bubble (LSB). The study aims t
 o provide an in-depth understanding of the transient mechanisms as well as
  the basis for new transition prediction methods at unsteady conditions.\n
 \nDirect numerical simulations (DNS) are performed where the gust disturba
 nce is imposed on the fully-resolved transitional boundary layers via unst
 eady boundary conditions. In this novel (hybrid) approach\, transient base
  flows are generated in advance with unsteady Reynolds-averaged Navier-Sto
 kes (URANS) simulations of entire unsteady airfoil flows in conjunction wi
 th the so-called disturbance velocity approach (DVA) to introduce sinusoid
 al gusts. The spatio-temporal evolution of the modal disturbances is analy
 zed using the continuous wavelet transform (CWT)\, which is then compared 
 with linear stability theory (LST) by employing a trajectory-following met
 hod developed for transient flows. The numerical methods are validated wit
 h experimental results.\n Details: \n 
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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