Large-Eddy Simulations of flow field around an isolated building with polyhedral cells: Does boundary layer mesh on building walls always improve numerical accuracy of wind environment?

WANG Wei, CAO Yong, OKAZE Tsubasa

doi:10.14887/windengresearch.26.0_157

Bibliographic Information

Other Title

ポリヘドラルメッシュを用いた建物周辺気流のLarge-Eddy Simulations: 建物壁面に配置した境界層メッシュは風環境の予測精度の改善に有効か？

Abstract

The large-eddy simulations were carried out to analyze the effects of boundary layer mesh and cell types (hexahedral and polyhedral cell) on the reproduction of pedestrian-level wind environment around a 1:1:2 isolated building. It was found that the application of boundary layer mesh can reduce the mesh non-orthogonality and skewness close to the flat ground, so the numerical accuracy of the flow field can be improved. However, it is also found that at the local region around the sharp corner of the building, it is difficult to well control the mesh non-orthogonality and skewness when applying the boundary layer mesh. As a result, the boundary layer mesh did not show improvement in the sensitive region such as the shear layer around the building. In terms of effects of cell types, the case with hexahedral cells generally shows slightly better accuracy than the polyhedral cases. However, the cell numbers of the polyhedral cases are over twice less than that of the hexahedral case, which indicates that polyhedral mesh is much more economical for the computational resources.

Journal

Wind Engineering Research

Wind Engineering Research 26 (0), 157-166, 2020

Japan Association for Wind Engineering

Keywords

Details 詳細情報について

CRID: 1390569623318896384

NII Article ID: 130008043921

DOI: 10.14887/windengresearch.26.0_157

ISSN: 24355429; 24354384

Text Lang: ja

Data Source

JaLC
CiNii Articles

Abstract License Flag: Disallowed

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