{"title":"Flow structure around a curved corner cylinder with varied attack angles","authors":"Talaat Abdelhamid, Ahmed G. Rahma, Rongliang Chen","doi":"10.1109/ICEEM52022.2021.9480633","DOIUrl":null,"url":null,"abstract":"The numerical simulations of this paper present the flow structure of an isothermal cylinder with curved corners r/R = 0.5, where R is the half-width and r is the corner radius of the cylinder, with varied angle of attack, α (0° ≤ α ≤ 45°). The cylinder is located perpendicular to the air stream flow with Re = 180 and Pr = 0.7. The solution of the governing equations obtained using ANSYS-FLUENT package. The variation of α from 0° to 45°, leads to two major flow regimes A and B. The flow regime of type A appears at small range of α (0° ≤ α < 10°), can be termed as trailing corner separated flow. The flow regime of type B appears within the large range of α (10° ≤ α ≤ 45°), can be termed as leading-trailing corner separated flow. The flow structure is unsteady and characteristic by alternating Kármán vortices appears for each α. The maximum vorticity ${\\left| {{\\mathbf{w}}_z^{\\ast}} \\right|_{\\max }}$ is inversely linked to the wake bubble length $L_b^{\\ast}$. The lower core (positive) instantaneous vorticity increases with increasing α with slight increasing for α = 0° - 5° and 30° - 45°, while large increasing for α = 5° - 30°.","PeriodicalId":352371,"journal":{"name":"2021 International Conference on Electronic Engineering (ICEEM)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2021 International Conference on Electronic Engineering (ICEEM)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICEEM52022.2021.9480633","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
The numerical simulations of this paper present the flow structure of an isothermal cylinder with curved corners r/R = 0.5, where R is the half-width and r is the corner radius of the cylinder, with varied angle of attack, α (0° ≤ α ≤ 45°). The cylinder is located perpendicular to the air stream flow with Re = 180 and Pr = 0.7. The solution of the governing equations obtained using ANSYS-FLUENT package. The variation of α from 0° to 45°, leads to two major flow regimes A and B. The flow regime of type A appears at small range of α (0° ≤ α < 10°), can be termed as trailing corner separated flow. The flow regime of type B appears within the large range of α (10° ≤ α ≤ 45°), can be termed as leading-trailing corner separated flow. The flow structure is unsteady and characteristic by alternating Kármán vortices appears for each α. The maximum vorticity ${\left| {{\mathbf{w}}_z^{\ast}} \right|_{\max }}$ is inversely linked to the wake bubble length $L_b^{\ast}$. The lower core (positive) instantaneous vorticity increases with increasing α with slight increasing for α = 0° - 5° and 30° - 45°, while large increasing for α = 5° - 30°.