Three-dimensional full-field simulation of sonic boom emanating from complex geometries over buildings

IF 1.7 4区 工程技术 Q3 MECHANICS
R. Yamashita, N. Nikiforakis
{"title":"Three-dimensional full-field simulation of sonic boom emanating from complex geometries over buildings","authors":"R. Yamashita,&nbsp;N. Nikiforakis","doi":"10.1007/s00193-023-01125-6","DOIUrl":null,"url":null,"abstract":"<div><p>Full-field direct simulation of sonic boom has only been applied to the analysis of axisymmetric geometries. In this work, a more realistic analysis of complex geometries over buildings is achieved by employing a combination of the following four numerical approaches: (i) a hierarchical structured adaptive mesh refinement method, (ii) a ghost fluid method for incorporating the immersed boundary conditions on the solid–fluid interfaces, (iii) a well-balanced finite volume method to allow stable stratification of the atmosphere, and (iv) a segmentation method of the computational domain to increase the efficiency of the computations. The three-dimensional Euler equations with a gravitational source term are solved over a stratified atmosphere. The simulation is split into two stages. Firstly, the entire flow field that involves a delta wing body is solved without buildings. Thereafter, the flow behaviors near the ground are recomputed considering rectangular and L-type buildings. Computational results show that the near- and far-fields waveforms are comparable to those from the wind tunnel experiment and the waveform parameter method, respectively. The waveform shape behind the shock waves is spiked due to the diffracted waves around buildings, with the spiking effect in L-type buildings being stronger than that in rectangular buildings. The pressure rises for rectangular and L-type buildings are significantly amplified due to double and triple reflections, respectively, each with an amplification factor comparable to the theoretical value. These results indicate that full-field simulation is promising for analyzing three-dimensional characteristics of sonic boom emanating from complex geometries passing over buildings.</p></div>","PeriodicalId":775,"journal":{"name":"Shock Waves","volume":null,"pages":null},"PeriodicalIF":1.7000,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00193-023-01125-6.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Shock Waves","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s00193-023-01125-6","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MECHANICS","Score":null,"Total":0}
引用次数: 0

Abstract

Full-field direct simulation of sonic boom has only been applied to the analysis of axisymmetric geometries. In this work, a more realistic analysis of complex geometries over buildings is achieved by employing a combination of the following four numerical approaches: (i) a hierarchical structured adaptive mesh refinement method, (ii) a ghost fluid method for incorporating the immersed boundary conditions on the solid–fluid interfaces, (iii) a well-balanced finite volume method to allow stable stratification of the atmosphere, and (iv) a segmentation method of the computational domain to increase the efficiency of the computations. The three-dimensional Euler equations with a gravitational source term are solved over a stratified atmosphere. The simulation is split into two stages. Firstly, the entire flow field that involves a delta wing body is solved without buildings. Thereafter, the flow behaviors near the ground are recomputed considering rectangular and L-type buildings. Computational results show that the near- and far-fields waveforms are comparable to those from the wind tunnel experiment and the waveform parameter method, respectively. The waveform shape behind the shock waves is spiked due to the diffracted waves around buildings, with the spiking effect in L-type buildings being stronger than that in rectangular buildings. The pressure rises for rectangular and L-type buildings are significantly amplified due to double and triple reflections, respectively, each with an amplification factor comparable to the theoretical value. These results indicate that full-field simulation is promising for analyzing three-dimensional characteristics of sonic boom emanating from complex geometries passing over buildings.

Abstract Image

建筑物上空复杂几何形状声爆的三维全场模拟
音爆的全场直接模拟只应用于轴对称几何形状的分析。在这项工作中,通过采用以下四种数值方法的组合,可以对建筑物上的复杂几何形状进行更现实的分析:(i)一种分层结构自适应网格细化方法,(ii)一种包含固体-流体界面浸入边界条件的鬼流体方法,(iii)一种平衡良好的有限体积方法,允许大气的稳定分层,以及(iv)一种计算域分割方法,以提高计算效率。在分层大气中求解了带引力源项的三维欧拉方程。仿真分为两个阶段。首先,在不考虑建筑物的情况下,对涉及三角翼体的整个流场进行求解。然后,重新计算了考虑矩形和l型建筑物的近地流动特性。计算结果表明,近场和远场波形分别与风洞实验和波形参数法的结果相当。由于建筑物周围绕射波的作用,激波后的波形形状呈尖峰状,且l型建筑物的尖峰效应强于矩形建筑物。矩形和l型建筑的压力上升分别由于双重和三重反射而被显著放大,每种放大系数与理论值相当。这些结果表明,利用全场模拟分析复杂几何形状的建筑物上空声爆的三维特性是有希望的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Shock Waves
Shock Waves 物理-力学
CiteScore
4.10
自引率
9.10%
发文量
41
审稿时长
17.4 months
期刊介绍: Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信