Modellierung turbulenter Strömungen mit Anwendungsfällen in der Bioklimatologie und Astrophysik

Content Provider	Semantic Scholar
Author	Merklein, Johannes
Copyright Year	2014
Abstract	When on the photo above the west wind Zephyr and in his arms the morning breeze Aura is not floating Venus on the shores of Cyprus , but instead blows out the birthday cake , then his breathing is what is known in fluid mechanics as " laminar flow " . A flow whose streamlines are parallel to one another and track their individual elements , here the air molecules , a rectified way . " Turbulent ", however, is the rising smoke from the candles on the cake that is blown away "towards the east " . This turbulence of liquids and gases is ubiquitous in our world, whether directly visible or invisible to our eyes : the air that is deeply drawn into our lungs to the alveoli , the traces of milk while stirring the contents in a coffee cup , the smoke , rising from a chimney , the water around the big and small pebbles in a stream, the wind that swirls around the church tower and the corner of the house , the hot plasma , which extents in fire flares from the sun's surface into space , or the large clouds of cosmic dust , which condense in swirls and eddies into galaxies or stars . " Turbulent " is thus a flow whose streamlines seem to cross over and where the individual elements follow no rectified way. Instead, there are a wide variety of shapes and patterns of entangled eddies on all scales . Because of this complexity in shapes and scale the description and prediction of turbulence belongs to the great mysteries in physics and mathematics for centuries. Since turbulent flows are nevertheless so central to many areas of human life and action , basic and applied research is pursued with vigor. The present study includes three applications of turbulence research, and it may be regarded as indicative of the ubiquity of turbulence that these three applications play in such different size scales . The wind cooling of cattle, which must be considered in the sub -millimeter scale in the range of coat and skin surface, the endangerment of forests by storms, to which sizes of between half a meter on the trees and several kilometers in the countryside are relevant, and finally the turbulent events in cosmic gas clouds and galaxies that takes place in the size range of many millions of light years. Not only in the techniques of modeling, but also in the physical reality these phenomena are closely related despite the massive difference in scales. In this sense, from the cosmos to the cow .
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Language	English
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Content Type	Text
Resource Type	Article