Comments on the Numerical Simulation of Homogeneous Stably-Stratified Turbulence |
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Authors: | Sergej S Zilitinkevich |
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Institution: | 1.Meteorological Research,Finnish Meteorological Institute,Helsinki,Finland;2.Nansen Environmental and Remote Sensing Centre/Bjerknes Centre for Climate Research,Bergen,Norway;3.Department of Physics, Division of Atmospheric Sciences and Geophysics,University of Helsinki,Helsinki,Finland |
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Abstract: | The standard design for the direct numerical simulation of homogeneous stably-stratified turbulence assumes that the simulated
turbulence is fully characterised by the gradient Richardson number. This assumption is justified only in sufficiently strong
stratification when the Obukhov turbulent length scale, L, is essentially smaller than the depth of the computational domain, H. Otherwise simulations are not quite realistic because they cut off the large-scale part of the turbulence spectrum, namely,
the scales comparable with or larger than H but smaller than L, that is just the eddies most sensitive to the stratification. |
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Keywords: | |
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