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خرید: Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer |جی اف
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Citations Publications citing this paper. Iman Gohari , Sutanu Sarkar. On entrainment in sheared convective boundary layers Armin Haghshenas.
Free Analyses Of Turbulence In The Neutrally And Stably Stratified Planetary Boundary Layer 2017
Characterization of windshear effects on entrainment in a convective boundary layer Armin Haghshenas , Juan Mellado. The horizontal and vertical components of the Coriolis force act in essentially different ways.
The vertical component mainly damps the coherent structures. It also turns the structures relative to the geostrophic wind. The horizontal component mainly makes the structures asymmetrical.
Universität zu Köln
Earlier studies of the depths of the geophysical planetary boundary layers PBLs basically focused on the effects of the earth's rotation and density stratification. One more inherent feature of geophysical flows, namely their baroclinicity, has not been considered in that context. The present paper makes up for this deficiency.
Diagnostic equations for the depths of the equilibrium, baroclinic, neutral or stable PBLs are derived and verified against data from large-eddy simulations LES. These latter represents the most convenient empirical-validation tool, which allows considering separately different types of PBL: barotropic and baroclinic; truly neutral and conventionally neutral; nocturnal stable and long-lived stable.
Results from the comparison show an excellent correspondence between the proposed equations and LES data. Please wait English Svenska Norsk. Cite Export. Permanent link. Citation style. Global intermittency can occur without external perturbations of the flow: in our cases it is simulated despite the absence of finite-size triggers from synoptic conditions, low-level jets or surface heterogeneities. It is hence intrinsic to a stable atmospheric boundary layer beyond a certain stability limit.
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We also observe that global intermittency is governed by a large-scale structure in the outer layer. This suggests that global intermittency cannot be treated as an on-off process in time, but should rather be seen as happening in time and space.
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Due to the elimination of turbulence closure schemes, in our work it becomes possible to study atmosphere-like setups under arbitrary stratification in a unified and well-controlled setup. This allows for the numerical study of turbulence regimes that have not been accessible to other turbulence-resolving tools such as LES and Reynolds-averaged methods due to issues with turbulence closures under very stable stratification.
By this method, we gain new insight into the fundamental dynamics of the SBL and quantitatively study certain aspects of turbulence closures including their a priori evaluation. References Ansorge, C.
Boundary-Layer Meteorology , Under Review.