Author
Taichi Shirasawa
Other affiliations: Tohoku University
Bio: Taichi Shirasawa is an academic researcher from Tokyo Polytechnic University. The author has contributed to research in topics: Wind speed & Turbulence. The author has an hindex of 3, co-authored 5 publications receiving 1323 citations. Previous affiliations of Taichi Shirasawa include Tohoku University.
Papers
More filters
TL;DR: In this paper, the authors present guidelines for using computational fluid dynamics (CFD) techniques for predicting pedestrian wind environment around buildings in the design stage, based on cross-comparison between CFD predictions, wind tunnel test results and field measurements.
1,619 citations
TL;DR: In this paper, three types of turbulence models, namely standard k-e and its revised linear form (Durbin model), as well as a revised nonlinear form (Shih model) are employed in two-dimensional numerical simulations of flow over two common types of topographic features.
48 citations
TL;DR: In this paper, the authors used LES and Durbin type k-e model to predict the flow and diffusion fields around a building and compared their results with those obtained by wind tunnel test.
Abstract: Flow and diffusion fields around a building were predicted by LES and Durbin type k-e model. The prediction accuracy of the both models was assessed by comparing their results with those obtained by wind tunnel test. The results of LES showed good agreement with experimental data in terms of mean wind velocity, turbulence statistics and mean gas concentration, while the significant differences were observed between the results of the experiment and the Durbin type k-e model concerning the flow and diffusion fields in the wake region behind the building. This is mainly due to the fact that the periodic motions caused by the vortex shedding were not reproduced by this model.
6 citations
Journal Article•
TL;DR: In this paper, three types of turbulence models, namely standard k-e and its revised linear form (Durbin model), as well as a revised nonlinear form (Shih model) are employed in two-dimensional numerical simulations of flow over two common types of topographic features.
Abstract: The accurate prediction of the wind energy distribution over terrains is important for making an appropriate selection of a suitable site for installing wind power plant. In this study, two-dimensional numerical simulations of flow over two common types of topographic features, i.e. a cliff and a hill, are presented. Three types of turbulence models, namely standard k-e and its revised linear form (Durbin model) as well as a revised nonlinear form (Shih model) are employed in this work. The performance of these models in predicting flow over these features is investigated. The accuracy of the prediction by using a z 0 type wall function to reproduce the effect of surface roughness on flowfield from these turbulence models is also examined.
3 citations
01 Mar 2022
TL;DR: In this article , the authors evaluated whether wind conditions affect human outdoor activities during spring and autumn (hereinafter, the mid-season) and found that there was a different tendency for the subjective evaluation of wind strength for each activity.
Abstract: This study evaluates whether wind conditions affect human outdoor activities during spring and autumn (hereinafter, the mid-season). Although several previous studies on wind environment have been conducted, only few studies related to its effect on various human activities are available in the literature. Wind velocity measurement and questionnaire survey were conducted during actual human activities in outdoor space. According to the results of the data collected, there was a different tendency for the subjective evaluation of wind strength for each activity. Wind condition assessment for each human activity was proposed.
Cited by
More filters
Journal Article•
28,685 citations
TL;DR: In this article, a summary of the "Best Practice Guideline" (BPG) document produced in the framework of the European COST Action 732 "Quality assurance and improvement of micro-scale meteorological models", available from the site given in the reference section, is presented.
Abstract: This paper is a summary of the "Best Practice Guideline" (BPG) document (Franke et al., 2007) produced in the framework of the European COST Action 732 "Quality assurance and improvement of micro-scale meteorological models", available from the site given in the reference section. The full document provides guidelines for undertaking simulations that are used to evaluate micro-scale obstacle-accommodating meteorological models. This paper provides an overview of the topics covered in the full document without reproducing the specific recommendations.
660 citations
TL;DR: In this paper, the importance of urban physics related to the grand societal challenges is described, after which the spatial and temporal scales in urban physics and the associated model categories are outlined.
627 citations
TL;DR: In this paper, the authors provide a perspective on the past, present and future of Computational Wind Engineering (CWE) and provide a more detailed view on CFD simulation of pedestrian-level wind conditions around buildings.
570 citations
TL;DR: A review of the techniques used to study UHI is presented in this article, where the abilities and limitations of each approach for the investigation of UHI mitigation and prediction are discussed.
566 citations