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SUMMARY:A skin-friction estimation method based on time-resolved TSP data 
 and a Taylor-hypothesis derived algorithm
DTSTART:20231129T140000
DTEND:20231129T150000
DTSTAMP:20260407T162507Z
UID:a2cab836104cdaba285e0a524866d423316ccb6ed53d4a47169c632d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Massimo Miozzi\, Ph.D.\, is a research scientist at the Instit
 ute of Marine Engineering CNR-INM (ex INSEAN) in Rome\, Italy. His researc
 h areas cover experimental and applied hydrodynamics and theoretical hydro
 dynamics models. He contributed to the development of image-analysis algor
 ithms for the measurement of kinematic quantities in single and multiphase
  flows and for the skin-friction direct estimation through the measurement
  of surface temperature via Temperature-Sensitive-Paint. Main topics of ap
 plication concern the study of the topology at- the-wall of attached and s
 eparated flows and associated themes\, e.g. active and passive drag reduct
 ion as well as transition and turbulence among the others. Other topics of
  interest focus on geophysical themes and include the physical models of f
 ree-surface flows at river mouth and of the wave-excited marine coastal se
 abed dynamics.\nThere are at least two direct links between the friction a
 cting on the surface of a (slightly warmer or colder) body under the influ
 ence of a surrounding flow and the temperature distribution on the surface
  of the body itself. The first is the so-called Reynolds’ analogy\, whi
 ch uses the energy equation to connect the thermal and momentum boundary l
 ayers by ascribing the evolution of the temperature distribution at the wa
 ll to the action of the skin-friction vector field. On theother hand\, a r
 elaxation of the “frozen turbulence” condition at the wall leads to an
  intriguing derivation of the Taylor Hypothesis\, which supplies an opera
 tive tool for the skin friction evaluation based on the direct relationshi
 p between the celerity of propagation of thermal blobs and the friction ve
 locity. The measurement of friction velocity and skin friction brings a me
 aningful description of the vorticity generation due to the interaction of
  the flow field with the body’s surface. Moreover\, the point of view o
 f the surface allows going deeper inside the onset of flow separation and 
 reattachment in regions where the flow topology strongly alters the bounda
 ry layer paradigm.\nThe presentation reports on the theoretical connection
  between the celerity of passive displacement of temperature disturbances 
 at the wall and skin friction. The seminar discusses the accuracy and crit
 ical issues of the method by illustrating some of its most recent applicat
 ions. Among them will be considered new results about the case of a liftin
 g NACA 0015 hydrofoil coated by a functional layer of Temperature Sensitiv
 e Paint and placed in the wake of a marine propeller.
LOCATION:https://epfl.zoom.us/j/66008031031?pwd=QnZaNlRpK0c5NXk5WGdxc0VoKz
 I4dz09
STATUS:CONFIRMED
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