Quasi-Periodic Generation of Coherent Vortical Structures Behind a Surface-Mounted Obstacle

Baur, Tillmann; Lukowicz, Joachim von; Köngeter, Jürgen

doi:10.1615/tsfp2.1240

Cited by 1 publication

(1 citation statement)

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“…Following the assessment of pressure evaluation methods for 2D PIV (Charonko 2010), the two most common approaches are spatial integration of the pressure gradient (Baur andKöngeter 2012, Liu andKatz 2006) and the solution of the Poisson equation for pressure resulting from the divergence of the momentum equation (de Kat and van Oudheusden 2012). The former approach is prone to accumulation of local measurement errors along the integration path and such errors can vary along different paths to the same point.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Flow pressure evaluation on generic surfaces by robotic volumetric PTV

Jux

Sciacchitano

Scarano

2020

Meas. Sci. Technol.

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An experimental approach for the measurement of the time-average fluid flow pressure over the surface of generic three-dimensional objects is presented. The method is based on robotic volumetric PTV measurements followed by the integration of the pressure gradient. The domain for pressure evaluation is subdivided in two parts: in the irrotational region the static pressure is obtained following Bernoulli relation; in the turbulent wake and close to the object the pressure gradient is integrated. An approach based on the total pressure distribution is proposed to estimate the boundary between these two regions. The method is first assessed with experiments around a sphere equipped with pressure taps. A criterion for minimum spatial resolution is formulated in terms of maximum ratio between bin size and local radius of curvature of the object. An experimental database from a three-dimensional problem of higher geometrical complexity is considered: the time-averaged flow field around a full-scale cyclist. The surface pressure distribution is discussed in connection to the topological features of near-surface streamlines and streamwise vortices.

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Section: Boundary Conditionsmentioning

confidence: 99%