Intermittency of laminar seperaration bubble during drag crisis in flow past a circular cylinder
Abstract eng: This work explores the phenomenon of drag crisis in flow past circular cylinder: a significant reduction in drag with increase in Re due to transition of boundary layer from laminar to turbulent state. The incompressible flow equations are solved using a stabilized finite element method for 1 × 104 ≤ Re ≤ 4 × 105 , in three dimensions. The computations successfully capture the phenomenon. It is shown that the drag crisis is accompanied with appearance of a Laminar Separation Bubble (LSB). The intermittent nature of the LSB during the transition is explored. In addition to the streamlines, the LSB may also be tracked via filtered Reynolds stress and fluctuations in surface pressure.
Publisher:
International Union of Theoretical and Applied Mechanics, 2016
Conference Title:
Conference Title:
24th International Congress of Theoretical and Applied Mechanics
Conference Venue:
Montreal (CA)
Conference Dates:
2016-08-21 / 2016-08-26
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.
Record appears in:
Record created 2016-11-15, last modified 2016-11-15
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