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SUMMARY:Jakub Cach (Charles University)
DTSTART:20260511T134000Z
DTEND:20260511T151000Z
DTSTAMP:20260517T231739Z
UID:NSCM/214
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/NSCM/214/">O
 n bifurcations and traction forces on an obstacle in incompressible flow</
 a>\nby Jakub Cach (Charles University) as part of Nečas Seminar on Contin
 uum Mechanics\n\nLecture held in Room K3\,  Faculty of Mathematics and Phy
 sics\, Charles University\, Sokolovská 83  Prague 8..\n\nAbstract\nWe pre
 sent a numerical study of flow-regime transitions in the two‑dimensional
  incompressible Navier--Stokes flow past a confined cylinder\, focusing on
  Reynolds numbers up to 1000 within the Schäfer--Turek benchmark. For a f
 ixed geometry\, we observe a clear empirical correspondence between qualit
 ative changes in steady boundary traction profiles\, defined as the pointw
 ise force density induced by the Cauchy stress tensor on the obstacle boun
 dary\, and bifurcations in the long‑time behavior of the unsteady flow. 
 The observed transitions include onset of time‑periodic oscillations\, s
 econdary modifications of the oscillatory wake\, emergence of pronounced a
 symmetry and the appearance of multiple steady solutions. These results in
 dicate that steady traction profiles on the obstacle provide a sensitive d
 iagnostic of critical Reynolds numbers at which qualitative changes in the
  global flow dynamics occur.\n
LOCATION:https://researchseminars.org/talk/NSCM/214/
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