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In aviation, the Richardson number is used as a rough measure of expected air turbulence. A lower value indicates a higher degree of turbulence. A lower value indicates a higher degree of turbulence. Values in the range 10 to 0.1 are typical [ citation needed ] , with values below unity indicating significant turbulence.
Generally, values in the range of around 10 to 50 suggest environmental conditions favorable for supercell development. [3] In the limit of layer thickness becoming small, the Bulk Richardson number approaches the Gradient Richardson number, for which a critical Richardson number is roughly Ri c = 0.25. Numbers less than this critical value are ...
The Bulk Richardson Number (BRN) is a dimensionless number relating vertical stability and vertical wind shear (generally, stability divided by shear). It represents the ratio of thermally-produced turbulence and turbulence generated by vertical shear. Practically, its value determines whether convection is free or forced.
Yet fatal turbulence in air travel remains extremely rare. "It is a very unusual and rare event. As far as I can tell it is over 25 years since a passenger was killed by commercial airliner ...
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A horizontal temperature gradient may occur, and hence air density variations, where air velocity changes. An example: the speed of the jet stream is not constant along its length; additionally air temperature and hence density will vary between the air within the jet stream and the air outside. Cirrus clouds often associated with clear-air ...
Richardson's notion of turbulence was that a turbulent flow is composed by "eddies" of different sizes. The sizes define a characteristic length scale for the eddies, which are also characterized by flow velocity scales and time scales (turnover time) dependent on the length scale.
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