Version 1
: Received: 2 April 2019 / Approved: 3 April 2019 / Online: 3 April 2019 (10:39:54 CEST)
How to cite:
Uchida, T.; Araki, K. Reproduction of Local Strong Wind Area Induced in the Downstream of Small‐scale Terrain by Computational Fluid Dynamic (CFD) Approach. Preprints2019, 2019040041. https://doi.org/10.20944/preprints201904.0041.v1
Uchida, T.; Araki, K. Reproduction of Local Strong Wind Area Induced in the Downstream of Small‐scale Terrain by Computational Fluid Dynamic (CFD) Approach. Preprints 2019, 2019040041. https://doi.org/10.20944/preprints201904.0041.v1
Uchida, T.; Araki, K. Reproduction of Local Strong Wind Area Induced in the Downstream of Small‐scale Terrain by Computational Fluid Dynamic (CFD) Approach. Preprints2019, 2019040041. https://doi.org/10.20944/preprints201904.0041.v1
APA Style
Uchida, T., & Araki, K. (2019). Reproduction of Local Strong Wind Area Induced in the Downstream of Small‐scale Terrain by Computational Fluid Dynamic (CFD) Approach. Preprints. https://doi.org/10.20944/preprints201904.0041.v1
Chicago/Turabian Style
Uchida, T. and Keiji Araki. 2019 "Reproduction of Local Strong Wind Area Induced in the Downstream of Small‐scale Terrain by Computational Fluid Dynamic (CFD) Approach" Preprints. https://doi.org/10.20944/preprints201904.0041.v1
Abstract
In this research, the computational fluid dynamic (CFD) approach that has been used in wind power generation
field was applied for the solution of the problems of local strong wind areas in railway fields, and the mechanism
of wind generation was discussed. At the same time, the affectivity of the application of computational fluid
dynamic approach to railway field was discussed. The problem of local wind that occurs on the railway line in
winter was taken up in this research. A computational simulation for the prediction of wind conditions by LES was
implemented and it was clarified that the local strong wind area is mainly caused by separated flows originating
from the small‐scale terrain positioned at its upstream (at approximately 180.0 m above sea level). Meanwhile, the
effects of the size of calculation area and spatial grid resolution on the result of calculation and the effect of
atmospheric stability were also discussed. It was clarified that when the air flow characteristic of the separated flow
originating from the small‐scale terrain (at altitude of approximately 180.0 m) targeted in this research is
reproduced at high accuracy by computational simulation of wind conditions, approximately 10.0 m of spatial
resolution of computational grid in horizontal direction is required. As a result of the computational simulation of
wind conditions of stably stratified flow (Fr = 1.0), lee waves were excited at the downstream of the terrain over
time. As a result, the reverse‐flow region lying behind the terrain that had been observed at a neutral time was
inhibited. Consequently, local strong wind area was generated at the downstream of the terrain and the strong
wind area passing through the observation mast was observed. By investigating the speed increasing rate of local
strong wind area induced at the time of stable stratification, it was found that the wind was approximately 1.2
times stronger than what was generated at a neutral time.
Keywords
Terrain‐induced severe wind event; Stratified flows; Computational Fluid Dynamics (CFD); LES
Subject
Engineering, Civil Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
