000014568 001__ 14568
000014568 005__ 20161115100155.0
000014568 04107 $$aeng
000014568 046__ $$k2016-08-21
000014568 100__ $$aMittal, Sanjay
000014568 24500 $$aExperimental investigation of flow past a sphere in the regime of boundary layer transition

000014568 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014568 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014568 506__ $$arestricted
000014568 520__ $$2eng$$aThe flow over a smooth sphere is experimentally investigated for 1.5 × 105 ≤ Re ≤ 5.5 × 105 via unsteady force and 2–D Particle Image Velocimetry(PIV) measurements. For Re > 3.3 × 105 , it is observed from the force measurements that the drag coefficient significantly reduces with increase in Re. This phenomenon, popularly known as the drag crisis, occurs in the critical flow regime due to the transition of the boundary layer over the sphere from laminar to turbulent state. The statistics from the force measurements reveal that the fluctuations in the force coefficients increase with Re in the subcritical regime. A steep fall in the fluctuations is observed in the critical regime. The normal Reynolds stresses in the separated shear layer, from the PIV measurements, are found to be one order lower in magnitude for the supercritical regime in comparison to the subcritical regime.

000014568 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014568 653__ $$a

000014568 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014568 720__ $$aMittal, Sanjay
000014568 8560_ $$ffischerc@itam.cas.cz
000014568 8564_ $$s90137$$uhttps://invenio.itam.cas.cz/record/14568/files/TS.FM07-2.05.pdf$$yOriginal version of the author's contribution as presented on CD,  page 931, code TS.FM07-2.05
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000014568 962__ $$r13812
000014568 980__ $$aPAPER