Abstract
The distributions of near-surface meteorological elements, such as wind, are greatly affected by the terrain underneath, which makes the power structure of micro geomorphic area more vulnerable to the influence of local climate. Single hills with length are one of typical terrains in microrelief. In this paper, the circulation caused by buoyant flows and temperate within typical single hilly terrain with length is studied. The Detached Eddy Simulation (DES) is used to integrate buoyancy, turbulence and micro-terrain into a single model and it is applied to the special situation of micro-terrain climate. How the wind field is influ-enced by different surface temperature and the model surface roughness is carefully described. The results show that, different surface temperature has a very strong effect on the speedup ratio. Compared with the air temperature, the lower the terrain surface temperature is, the more obvious the speedup ratio effect is, and vice versa. For different roughness surface terrain, the speedup ratio has almost the same characteristics.
Highlights
It’s easy to have ice grow on transmission line in microrelief region than other areas due to the micro-climate caused by terrain
In (4), the effective SGS thermal diffusivity, ߙ௧ is the sum of the molecular thermal diffusivity.The radiative transfer of Eq (4), which considers the use of the radiation models available in OpenFOAM(Vdovin A[11]).In general we did not activate radiation in the our cases
The results of the present study can provide basic aerodynamic information to calculate the wind fields with finer resolution for a dynamical downscaling model and a parametric wind field model, some conclusions are as follows: (1) Wind speed ratios above the terrain surface are affected by the surface temperature
Summary
It’s easy to have ice grow on transmission line in microrelief region than other areas due to the micro-climate caused by terrain. There are still many challenges in providing finer resolution wind fields when considering the complicated or finer-resolution terrain in the dynamic framework of the numerical weather prediction (NWP) model (Wyngaard [1]). In the transmission line of mountain area, because the temperature difference between mountain and air changes greatly, when there is sudden wind, it is easy to happen flashover accident and galloping accident. Aerodynamic characteristics around terrain of different roughness and with different temperature were studied numerically. The structure of this first part of the work, we briefly describe the numerical treatment used to deal with the physical problem.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
