Topic
Drag coefficient
About: Drag coefficient is a research topic. Over the lifetime, 14471 publications have been published within this topic receiving 303196 citations. The topic is also known as: drag factor.
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TL;DR: In this article, large-eddy simulations of the flow past a circular cylinder are used to investigate the flow topology and the vortex shedding process at Reynolds numbers Re = 2.5 × 10 5 -8.5× 10 5.
78 citations
TL;DR: In this paper, the neutral stability, 10-m, air-ice drag coefficient, CDN10, was computed from 197 hourly averaged, four-level wind speed profiles collected on Ice Station Weddell (ISW) in February and March 1992.
Abstract: From 197 hourly averaged, four-level wind speed profiles collected on Ice Station Weddell (ISW) in February and March 1992, we compute the neutral stability, 10-m, air-ice drag coefficient, CDN10. Values range from 1.3×10−3 to 2.5×10−3 for the multiyear ice floe that was ISW. Individual CDN10 values depend critically on how well the mean wind is aligned with the dominant snowdrift patterns. On ISW, 20% of the time, we experienced drifting or blowing snow; when the wind speed at 5 m exceeded 8 m s−1, such wind-driven snow was a virtual certainty. Consequently, the surface was continually changing, drifts were building, drifts were eroding. As the wind continued from a constant direction and the building drifts streamlined the surface, CDN10 could decrease by as much as 30% in 12 hours. If the wind direction then shifted by as little as 20°, CDN10 would immediately increase significantly. The implications are that snow-covered sea ice does not present an isotropic surface; it has a preferred direction dictated by the wind's history. Consequently, computing surface stress using an average value for CDN10 will produce errors of up to 30%.
78 citations
TL;DR: In this paper, a rod was set upstream of a circular cylinder to control the flow around the cylinder in air-stream, and two flow patterns with and without vortex shedding from the rod occurred.
78 citations
TL;DR: In this paper, the effect of angularmomentum induced anisotropy on the instantaneous drag force of a heavy quark was investigated using the Kerr-AdS black hole model.
Abstract: Using AdS/CFT we investigate the effect of angular-momentum-induced anisotropy on the instantaneous drag force of a heavy quark. The dual description is that of a string moving in the background of a Kerr-AdS black hole. The system exhibits the expected focusing of jets towards the impact parameter plane. We put forward that we can use the connection between this focusing behavior and the angular momentum induced pressure gradient to extrapolate the pressure gradient correction to the drag force that can be used for transverse elliptic flow in realistic heavy ion collisions. The result is recognizable as a relativistic pressure gradient force.
78 citations
TL;DR: In this article, a unified additive power-law model, a normalised form of the Herschel-Bulkley model from fluid mechanics, is explored in conjunction with a large deformation finite element approach to investigate the undrained limiting loads on a cylinder moving steadily through inertia-less soft rate-dependent material.
78 citations