The flow around two circular cylinders of equal diameter, arranged in a staggered
configuration, was investigated using flow visualization and particle image velocimetry
for centre-to-centre pitch ratio P/D = 1[ratio ]0 to 5.0 and angle of incidence. α = 0°
to 90°. Experiments were conducted within the low subcritical Reynolds number
regime, from Re = 850 to 1900. Nine flow patterns were identified, and processes of
shear layer reattachment, induced separation, vortex pairing and synchronization, and
vortex impingement, were observed. New insight was gained into previously published
Strouhal number data, by considering the flow patterns involved. The study revealed
that vortex shedding frequencies are more properly associated with individual shear
layers than with individual cylinders; more specifically, the two shear layers from the
downstream cylinder often shed vortices at different frequencies.
Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses 20.3 fb of TeV data collected in 2012 with the ATLAS detector at the LHC. Events are required to have at least one jet with GeV and no leptons. Nine signal regions are considered with increasing missing transverse momentum requirements between GeV and GeV. Good agreement is observed between the number of events in data and Standard Model expectations. The results are translated into exclusion limits on models with either large extra spatial dimensions, pair production of weakly interacting dark matter candidates, or production of very light gravitinos in a gauge-mediated supersymmetric model. In addition, limits on the production of an invisibly decaying Higgs-like boson leading to similar topologies in the final state are presented.
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