On the use of a two-layer model for large-eddy simulations of supersonic boundary layers with separation

2021 ◽  
Vol 90 ◽  
pp. 108821
Author(s):  
B. Zebiri ◽  
A. Piquet ◽  
A. Hadjadj
Keyword(s):  
Boundary Layers ◽  
Large Eddy Simulations ◽  
Layer Model ◽  
Large Eddy ◽  
Two Layer Model

scholarly journals Subcloud-Layer Feedbacks Driven by the Mass Flux of Shallow Cumulus Convection over Land

2014 ◽  
Vol 71 (3) ◽  
pp. 881-895 ◽  
Author(s):  
Bart J. H. van Stratum ◽  
Jordi Vilá-Guerau de Arellano ◽  
Chiel C. van Heerwaarden ◽  
Huug G. Ouwersloot
Keyword(s):  
Boundary Layers ◽  
Mixed Layer ◽  
Mass Flux ◽  
Large Eddy Simulations ◽  
Cloud Layer ◽  
Layer Model ◽  
Flux Transport ◽  
Shallow Cumulus ◽  
Large Eddy ◽  
Mixed Layer Model

Abstract The processes and feedbacks associated with the mass flux of shallow cumulus clouds over land are studied by analyzing the results from large-eddy simulations and a mixed-layer model. The primary focus is to study the development of the (well mixed) subcloud layer and understand the four primary feedbacks between the subcloud-layer dynamics and cumulus mass flux. Guided by numerical experiments in large-eddy simulations that show the transition from clear to cloudy boundary layers at midlatitudes over land, the feedbacks introduced by shallow cumuli are first conceptually described. To study the complex interplay between the subcloud and cloud layer, a mixed-layer model is proposed and validated with large-eddy simulations for the Atmospheric Radiation Measurement Southern Great Plains case. The mixed-layer model is shown to identify and reproduce the most relevant feedbacks in the transition from clear to cloudy boundary layers: a reduced mixed-layer growth and drying of the subcloud layer by enhanced entrainment and mass flux transport of moisture to the cloud layer. To complete the study, the strength of the different feedbacks is further quantified by an analysis of the individual contributions to the tendency of the relative humidity at the top of the mixed layer.

A simple atmospheric boundary layer model applied to large eddy simulations of wind turbine wakes

Wind Energy ◽  
2013 ◽  
Vol 17 (4) ◽  
pp. 657-669 ◽  
Author(s):  
Niels Troldborg ◽  
Jens N. Sørensen ◽  
Robert Mikkelsen ◽  
Niels N. Sørensen
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Wind Turbine ◽  
Large Eddy Simulations ◽  
Layer Model ◽  
Boundary Layer Model ◽  
Large Eddy

A wall-layer model for large-eddy simulations of turbulent flows with/out pressure gradient

2011 ◽  
Vol 23 (1) ◽  
pp. 015101 ◽  
Author(s):  
C. Duprat ◽  
G. Balarac ◽  
O. Métais ◽  
P. M. Congedo ◽  
O. Brugière
Keyword(s):  
Pressure Gradient ◽  
Turbulent Flows ◽  
Wall Layer ◽  
Large Eddy Simulations ◽  
Layer Model ◽  
Large Eddy
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