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Wake flow visualization of a dandelion pappus with posture change 蒲公英脑浆随姿态变化的尾流可视化
IF 0.8
Journal of Fluid Science and Technology Pub Date : 2023-01-01 DOI: 10.1299/jfst.2023jfst0019
Y. Shigenaga, H. Hasegawa
{"title":"Wake flow visualization of a dandelion pappus with posture change","authors":"Y. Shigenaga, H. Hasegawa","doi":"10.1299/jfst.2023jfst0019","DOIUrl":"https://doi.org/10.1299/jfst.2023jfst0019","url":null,"abstract":"","PeriodicalId":44704,"journal":{"name":"Journal of Fluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66308074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Blunt leading-edge effect on spanwise-varying leading-edge contours of an UCAV configuration 钝前缘对无人机展向变化前缘轮廓的影响
IF 0.8
Journal of Fluid Science and Technology Pub Date : 2023-01-01 DOI: 10.1299/jfst.2023jfst0012
Yu-Hsin Chen, J. Miau, Yen-Po Chen, yng-ru chen
{"title":"Blunt leading-edge effect on spanwise-varying leading-edge contours of an UCAV configuration","authors":"Yu-Hsin Chen, J. Miau, Yen-Po Chen, yng-ru chen","doi":"10.1299/jfst.2023jfst0012","DOIUrl":"https://doi.org/10.1299/jfst.2023jfst0012","url":null,"abstract":"","PeriodicalId":44704,"journal":{"name":"Journal of Fluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66308348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A preliminary attempt to combine in situ CT measurements with permeability tests of fractured granite cores 将现场CT测量与花岗岩岩心裂缝渗透率试验相结合的初步尝试
IF 0.8
Journal of Fluid Science and Technology Pub Date : 2023-01-01 DOI: 10.1299/jfst.2023jfst0030
Zhuang Li, Changlun Sun, C. Pham, S. Yeom, H. Shin
{"title":"A preliminary attempt to combine in situ CT measurements with permeability tests of fractured granite cores","authors":"Zhuang Li, Changlun Sun, C. Pham, S. Yeom, H. Shin","doi":"10.1299/jfst.2023jfst0030","DOIUrl":"https://doi.org/10.1299/jfst.2023jfst0030","url":null,"abstract":"","PeriodicalId":44704,"journal":{"name":"Journal of Fluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66308603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prediction of optimal control input in a fully developed turbulent channel flow by machine learning 用机器学习预测完全发展的湍流通道流的最优控制输入
IF 0.8
Journal of Fluid Science and Technology Pub Date : 2023-01-01 DOI: 10.1299/jfst.2023jfst0033
Yusuke Yugeta, Kosetsu Uji, Toshitaka Itoh, Y. Hasegawa
{"title":"Prediction of optimal control input in a fully developed turbulent channel flow by machine learning","authors":"Yusuke Yugeta, Kosetsu Uji, Toshitaka Itoh, Y. Hasegawa","doi":"10.1299/jfst.2023jfst0033","DOIUrl":"https://doi.org/10.1299/jfst.2023jfst0033","url":null,"abstract":"","PeriodicalId":44704,"journal":{"name":"Journal of Fluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66308612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A novel approach for wall-boundary immersed flow simulation (proposal of modified Navier-Stokes equation) 壁面边界浸入式流动模拟的新方法(修正Navier-Stokes方程的提出)
Journal of Fluid Science and Technology Pub Date : 2023-01-01 DOI: 10.1299/jfst.2023jfst0034
Nobuyuki OSHIMA
{"title":"A novel approach for wall-boundary immersed flow simulation (proposal of modified Navier-Stokes equation)","authors":"Nobuyuki OSHIMA","doi":"10.1299/jfst.2023jfst0034","DOIUrl":"https://doi.org/10.1299/jfst.2023jfst0034","url":null,"abstract":"This study proposes a novel approach for the wall-boundary immersed flow simulation, wherein the Navier-Stokes equation is modified to include a level-set definition of a solid body in fluid flow. The proposed numerical model is defined via a system of differential equations based on the law of conservation and has a continuous approximate profile near the solid body. It yields a stable viscosity solution using a simple algorithm and scheme without any upwind schemes, numerical limiters, or addition filters. The model is numerically validated via solutions of flow around a cylinder, which are consistent with theoretical and experimental results for both steady and unsteady cases based on the wide Reynolds number (Re=8–160) of laminar flow condition.","PeriodicalId":44704,"journal":{"name":"Journal of Fluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135505123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reduced order modeling of fluid flows using convolutional neural networks 基于卷积神经网络的流体流动降阶建模
IF 0.8
Journal of Fluid Science and Technology Pub Date : 2023-01-01 DOI: 10.1299/jfst.2023jfst0002
K. Fukagata
{"title":"Reduced order modeling of fluid flows using convolutional neural networks","authors":"K. Fukagata","doi":"10.1299/jfst.2023jfst0002","DOIUrl":"https://doi.org/10.1299/jfst.2023jfst0002","url":null,"abstract":"","PeriodicalId":44704,"journal":{"name":"Journal of Fluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66307339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Development of parameter-free, two-fluid, viscous multiphase flow solver for cough-droplet simulations 无参数、双流体、粘性多相流咳嗽液滴模拟求解器的开发
IF 0.8
Journal of Fluid Science and Technology Pub Date : 2023-01-01 DOI: 10.1299/jfst.2023jfst0016
J. Aono, K. Kitamura
{"title":"Development of parameter-free, two-fluid, viscous multiphase flow solver for cough-droplet simulations","authors":"J. Aono, K. Kitamura","doi":"10.1299/jfst.2023jfst0016","DOIUrl":"https://doi.org/10.1299/jfst.2023jfst0016","url":null,"abstract":"Multiphase flows arise in various fields that involve complicated phenomena. Studies have shown that COVID-19 can occur via air microdroplets, and breathing jets with microdroplets turn into turbulent cloud or puffs in cases of coughing and sneezing (Bourouiba et al., 2014). Microdroplets are upturned by buoyancy in the turbulent cloud and transported without falling. Furthermore, they float in air for hours and can be transported over long distances (Mittal et al., 2020). This scenario also involves a mixed phase flow of air and droplets. To simulate these phenomena, a numerical model assuming mechanical and thermal non-equilibrium multiphase flow is required to predict the range of turbulent cloud transport. In this study, to better simulate the turbulent cloud trajectories, a viscosity term is added to a two-phase flow six-equation model (two-fluid modeling or effective-fluid modeling, EFM) developed by Liou et al. (2008). It is a development of a parameter-free, viscous multiphase flow code, based on a single-phase compressible finite-volume solver (Kitamura et al., 2013). This solver is validated in the Poiseuille flow and laminar-flat-plate problem with an isothermal wall through a comparison with the analytical solutions. A detailed simulation of coughing is performed. The location of the turbulent cloud upturned by buoyancy is compared with the data of past studies.","PeriodicalId":44704,"journal":{"name":"Journal of Fluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66308235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical simulation of two-phase flow in a microchannel for evaluating liquid film thickness and its Reynolds number dependency 微通道内两相流动的数值模拟，以评估液膜厚度及其与雷诺数的关系
IF 0.8
Journal of Fluid Science and Technology Pub Date : 2023-01-01 DOI: 10.1299/jfst.2023jfst0029
Daisuke Tsuneoka, J. Okajima
{"title":"Numerical simulation of two-phase flow in a microchannel for evaluating liquid film thickness and its Reynolds number dependency","authors":"Daisuke Tsuneoka, J. Okajima","doi":"10.1299/jfst.2023jfst0029","DOIUrl":"https://doi.org/10.1299/jfst.2023jfst0029","url":null,"abstract":"","PeriodicalId":44704,"journal":{"name":"Journal of Fluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66308601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of contraction ratio on loss reduction of the flow in the reducing elbow duct with a weir-shaped obstacle 收缩率对带堰状障碍物的减径弯管减损的影响
IF 0.8
Journal of Fluid Science and Technology Pub Date : 2023-01-01 DOI: 10.1299/jfst.2023jfst0010
T. Ando, T. Shakouchi, Atsushi Hanai, Nobuyuki Hayashi, Yohei Fukuta, K. Tsujimoto, Mamoru Takahashi
{"title":"Effects of contraction ratio on loss reduction of the flow in the reducing elbow duct with a weir-shaped obstacle","authors":"T. Ando, T. Shakouchi, Atsushi Hanai, Nobuyuki Hayashi, Yohei Fukuta, K. Tsujimoto, Mamoru Takahashi","doi":"10.1299/jfst.2023jfst0010","DOIUrl":"https://doi.org/10.1299/jfst.2023jfst0010","url":null,"abstract":"","PeriodicalId":44704,"journal":{"name":"Journal of Fluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66307641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fluidic force and wake velocity of 3D body with four limbs in uniform flow 三维四肢体在均匀流动中的流动力和尾迹速度
IF 0.8
Journal of Fluid Science and Technology Pub Date : 2023-01-01 DOI: 10.1299/jfst.2023jfst0007
S. Yamada, T. Tsujita
{"title":"Fluidic force and wake velocity of 3D body with four limbs in uniform flow","authors":"S. Yamada, T. Tsujita","doi":"10.1299/jfst.2023jfst0007","DOIUrl":"https://doi.org/10.1299/jfst.2023jfst0007","url":null,"abstract":"","PeriodicalId":44704,"journal":{"name":"Journal of Fluid Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66307866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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