Passive A-band Wind Sounder (PAWS) for measuring tropospheric wind velocity profile

2007 ◽  
Author(s):  
Grzegorz Miecznik ◽  
Robert Pierce ◽  
Pei Huang ◽  
Philip A. Slaymaker ◽  
Paul Kaptchen ◽  
...  
Keyword(s):  
Velocity Profile ◽  
Wind Velocity ◽  
Tropospheric Wind

A numerical approach for the assessment of crosswind effects on barrier-protected trains running on bridges

2021 ◽  
Author(s):  
Giuseppe Porpiglia ◽  
Paolo Schito ◽  
Tommaso Argentini ◽  
Alberto Zasso
Keyword(s):  
Wind Tunnel ◽  
Velocity Profile ◽  
Wind Velocity ◽  
Aerodynamic Force ◽  
Numerical Approach ◽  
Aerodynamic Performance ◽  
Vehicle Speed ◽  
Initial Condition ◽  
Cfd Analyses ◽  
Moving Train

<p>This paper introduces a new methodology to assess the influence of a windscreen on the crosswind performance of trains running on a bridge. Considering the difficulties encountered in both carrying out wind tunnel tests that consider the vehicle speed or complete CFD analyses, a simplified CFD approach is here discussed. Instead of simulating simultaneously the windscreen plus the moving train, the numerical problem is split into two parts: firstly, a simulation of the windshield alone is used to extract the perturbed velocity profile at the railway location; secondly, this profile used as an inlet condition for the wind velocity acting on an isolated train. The method is validated against a complete train plus windshield simulation in terms of pressure distribution and aerodynamic force coefficients on the train, and flow streamlines. This approach opens to the possibility of evaluating the aerodynamic performance of a vehicle on bridges considering bridge and vehicle as separated. Wind velocity profiles measured on the bridge during a wind tunnel campaign could be used as the initial condition for numerical simulations on vehicles.</p>

A Brief Study on the Characteristics of Tropospheric Wind Energy over Wuhan Based on Certain Energy Materials

2011 ◽  
Vol 63-64 ◽  
pp. 519-522 ◽  
Author(s):  
Wei Li ◽  
Hao Ge Ma ◽  
Zhi Wei Cai
Keyword(s):  
Wind Velocity ◽  
Lower Stratosphere ◽  
Meridional Wind ◽  
Wave Activity ◽  
Lower Atmosphere ◽  
Horizontal Wind ◽  
Energy Materials ◽  
Height Range ◽  
Summer Minimum ◽  
Tropospheric Wind

By analysing the wind data observed by radiosonde during 2000-2002 in Wuhan, zonal and meridional wind velocity, wind shear and energy were discussed. A winter maximum and a summer minimum of the zonal wind velocity which pace up and down between the height of 10-15km was found. The weaker variation of the meridional wind reflects the seasonal variation of gravity wave activity in the lower atmosphere. The energy variation show a trend stronger in winter and spring then in other seasons. A winter maximum and a summer minimum in the troposphere and lower stratosphere was also found, which ranged in similar height range as wind velocity. As a result, a strong correlation between horizontal wind velocity and kinetic energy can be infered.

An analytic expression for wind-velocity profile within the saltation layer

Geomorphology ◽  
2004 ◽  
Vol 60 (3-4) ◽  
pp. 359-369 ◽  
Author(s):  
Z.S. Li ◽  
J.R. Ni ◽  
C. Mendoza
Keyword(s):  
Velocity Profile ◽  
Wind Velocity ◽  
Analytic Expression

On wind velocity profile measurements taken in wind tunnels with saltating grains

Sedimentology ◽  
1995 ◽  
Vol 42 (3) ◽  
pp. 515-521 ◽  
Author(s):  
PETER-JOST SPIES ◽  
IAN K. McEWAN ◽  
GRAEME R. BUTTERFIELD
Keyword(s):  
Velocity Profile ◽  
Wind Velocity ◽  
Wind Tunnels
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