![]() T1 - Planar visualizations of large-scale turbulent structures in axisymmetric supersonic base flows Evidence of an amalgamation of end-view structures in the images at the reattachment point illustrates one of the mechanisms responsible for this reduction.", The average number of structures present in the endview plane decreases significantly from 10-14 at recompression to 4-5 in the developing wake region. It is concluded that the wedge shape is caused by the axisymmetric confinement of the shear layer as it approaches the wake centerline. End-view structures are wedge-shaped, wider on the freestream side than on the recirculating or developing wake side. It is also shown that the effect of lateral streamline convergence for this axisymmetric case causes a reduction in structure size and eccentricity at the reattachment point. ![]() Spatial correlation analyses of large ensembles of images show that the mean side-view structure is highly strained and elliptical in shape and is inclined toward the local freestream direction. The experimental diagnostic used was planar visualization of condensed ethanol droplets that were suspended in the supersonic freestream. ![]() Evidence of an amalgamation of end-view structures in the images at the reattachment point illustrates one of the mechanisms responsible for this reduction.Ībstract = "The spatial evolution of large-scale turbulent structures in an axisymmetric, supersonic base flow has been investigated. Do I rather stay quiet and wait, wait in here and be safer here? Or do I have to go out at some point and see if I can get something to drink or start communicating and try to get out of this situation.The spatial evolution of large-scale turbulent structures in an axisymmetric, supersonic base flow has been investigated. Roewekamp said: “Every day there was this risk-benefit trade-off. The couple stayed there for days, rationing the battery left on their mobile phones in order to check for messages. “We realised pretty quickly that there would be no more flights and that we would have to stay in the hotel,” said Schauer. They told Reuters they were at a hotel in the government district in Khartoum when they noticed military movements. Mareike Roewekamp, 41, and Horst Schauer, 67, were planning to run through 12 countries over at least eight months and already had Egypt and Tunisia under their belts when they were in Sudan this month. Two German endurance athletes on a mission to run 12,000km (7,400 miles) between the northernmost and southernmost tips of Africa had a sudden change in plans after being trapped in Sudan by fighting and having to find a way to get out of the country.
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