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SUMMARY:MechE Colloquium: Investigations of Turbulence: a Journey from Nan
 ometer to Kilometer
DTSTART:20171212T121500
DTEND:20171212T131500
DTSTAMP:20260919T215229Z
UID:8069be9fc3c4d24240f24075fcca77e6f63546a4b2269ef280beea86
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Marcus Hultmark\, Department of Mechanical and Aerospace
  Engineering\, Princeton University\nAbstract:\nOur inability to predict t
 urbulence introduces significant uncertainty in the design of many enginee
 ring applications. Many theoretical predictions and models have been devel
 oped for turbulence in the limit of infinite Reynolds numbers. However\, n
 o real-world application operates at infinite Reynolds number\, and it is 
 typically unknown how large the Reynolds number needs to be in order to ex
 pect the theoretical predictions to hold. It is also not well understood h
 ow low Reynolds numbers affect the flow dynamics and how to best model the
 m. What makes turbulent flows particularly challenging—theoretically\, n
 umerically and experimentally—is the large range of spatial and temporal
  scales contained within them\, with the smallest eddies typically many or
 ders of magnitude smaller than the largest eddies. To enable fully resolve
 d investigations of high Reynolds number turbulent flows\, a range of nove
 l subminiature sensors have been developed. To ensure accurate representat
 ion of the flow field\, the thermal and mechanical properties of the senso
 rs and sensor systems are characterized in detail. This knowledge acts as 
 a guide for further sensor improvements. In combination with extreme facil
 ities\, these sensors allow unique insights into flows that previously hav
 e not been possible. A model wind turbine setup has been developed that al
 lows—for the first time—well-controlled laboratory tests at dynamic si
 milarity to a full-scale machine. The effect of Reynolds number on the per
 formance of both vertical and horizontal axis wind turbines is characteriz
 ed and compared to field measurements. \n\nBio:\nMarcus Hultmark is an as
 sistant Professor in the Department of Mechanical and Aerospace Engineerin
 g at Princeton University.  His research interests include a variety of p
 roblems related to fluid mechanics\, with focus on problems involving turb
 ulence\, such as heat and mass transfer as well as drag reduction and wind
  energy. Theoretical work is combined with experimental studies\, and an i
 mportant part of his research program is the development and evaluation of
  new sensing techniques to investigate these phenomena with high accuracy\
 , including velocity\, temperature and humidity sensors. He was awarded th
 e 2016 Air Force Young Investigator award\, the 2017 NSF Career award and 
 the 2017 Nobuhide Kasagi Award. He received his M.Sc. degree from Chalmers
  University in Sweden and his Ph.D. from Princeton University.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CANCELLED
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