Advances in Aerodynamics最新文献_第9页

High fidelity numerical simulations on the unsteady flow field of low-pressure turbine cascades with and without upstream disturbance at moderate Reynolds number 中等雷诺数下有无上游扰动的低压涡轮叶栅非定常流场高保真数值模拟

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2022-03-15 DOI: 10.1186/s42774-022-00103-3

Zhu, Hongbo, Pang, Xiyuan, Wu, Feng, Zhang, Chunxiao, Bao, Yan, Xu, Hui

{"title":"High fidelity numerical simulations on the unsteady flow field of low-pressure turbine cascades with and without upstream disturbance at moderate Reynolds number","authors":"Zhu, Hongbo, Pang, Xiyuan, Wu, Feng, Zhang, Chunxiao, Bao, Yan, Xu, Hui","doi":"10.1186/s42774-022-00103-3","DOIUrl":"https://doi.org/10.1186/s42774-022-00103-3","url":null,"abstract":"This paper numerically investigates the aerodynamic performance of the T106A low-pressure turbine based with different inflow conditions at moderate Reynolds number by using high performance computing based on high order unstructured methods. Two different inflow conditions respectively of uniform and disturbed are considered, while for the latter a small circular cylinder is placed upstream of the cascade to generate wake turbulence as a long-standing disturbance. A high order Fourier-spectral/hp element method is employed to solve the flow dynamics in the cascade of high complex geometries. Flow transition characteristics are quantified in terms of the distribution of cascade wall surface pressure and friction coefficient, the distribution of wake profile pressure loss and the evolution characteristics of boundary layer flow structures as well. The numerical results show that the current numerical simulations accurately predict the flow transition performance of low-pressure turbine cascades and capture the effects of wake-generated disturbance on the cascade, which is shown to effectively modify the flow transition performance as compared with the uniform inflow case.","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138512102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Visual analytics of combustion on time-varying turbulent-flow 时变湍流燃烧的可视化分析

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2022-02-23 DOI: 10.1186/s42774-022-00101-5

Xiaoyang Han, Yifei An, Guihua Shan, Jun Liu, Bo Yang

引用次数: 0

Criteria of tracking vortex surfaces in turbulent-like flows 类湍流中旋涡面跟踪准则

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2022-02-01 DOI: 10.1186/s42774-021-00100-y

Zishuo Han, Yue Yang

引用次数: 3

Moving computational multi-domain method for modelling the flow interaction of multiple moving objects 多运动物体流动相互作用的运动计算多域方法

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2022-01-24 DOI: 10.1186/s42774-021-00099-2

Momoha Nishimura, M. Yamakawa, S. Asao, Seiichi Takeuchi, Mehdi Badri Ghomizad

引用次数: 0

Optimized sparse polynomial chaos expansion with entropy regularization 熵正则化优化稀疏多项式混沌展开

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2022-01-17 DOI: 10.1186/s42774-021-00095-6

SiJie Zeng, X. Duan, Jiangtao Chen, Liang Yan

引用次数: 1

Extension of the KDO turbulence/transition model to account for roughness KDO湍流/过渡模式的扩展以考虑粗糙度

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2022-01-14 DOI: 10.1186/s42774-021-00092-9

Chunfei Fang, Jinglei Xu

引用次数: 1

Generalization enhancement of artificial neural network for turbulence closure by feature selection 基于特征选择的湍流闭合人工神经网络泛化增强

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2022-01-13 DOI: 10.1186/s42774-021-00088-5

Linyang Zhu, Weiwei Zhang, Guohua Tu

引用次数: 2

Broadband design of acoustic metasurfaces for the stabilization of a Mach 4 boundary layer flow 稳定马赫数4边界层流动的声学超表面宽带设计

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2021-12-14 DOI: 10.21203/rs.3.rs-1140242/v1

R. Zhao, Xiao Liu, C. Wen, Xiaoyong Wang

{"title":"Broadband design of acoustic metasurfaces for the stabilization of a Mach 4 boundary layer flow","authors":"R. Zhao, Xiao Liu, C. Wen, Xiaoyong Wang","doi":"10.21203/rs.3.rs-1140242/v1","DOIUrl":"https://doi.org/10.21203/rs.3.rs-1140242/v1","url":null,"abstract":"A piecewise acoustic metasurface is designed to suppress the first mode while marginally amplifying the Mack second mode in a Mach 4 flat-plate boundary layer (BL) flow. The results of linear stability theory (LST) and the e N method demonstrate the stabilization effect and transition delay performance, respectively. However, the direct numerical simulation (DNS) results indicate that the designed broadband acoustic metasurface actually weakly excites the first mode with a slightly larger fluctuating pressure amplitude at the surface, which is in contrast to the analysis of LST. The discrepancies are found to lie in the ‘roughness’ effect caused by the recirculation zones inside the microslits and the alternating expansion and compression waves induced at the slit edges, which significantly amplifies the first mode. For further clarification of the competitive mechanism between the acoustic stabilization and ‘roughness’ destabilization effects of metasurfaces on the first mode, a carefully designed metasurface is installed at the maximum growth rate region, which excites the first mode on the metasurface but inhibits its development downstream.","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2021-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47283666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Far-field approximations to the derivatives of Green’s function for the Ffowcs Williams and Hawkings equation Ffowcs-Williams和Hawkings方程Green函数导数的远场近似

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2021-11-30 DOI: 10.1186/s42774-022-00109-x

Zhiteng Zhou, Zhenyu Zang, Hongping Wang, Shizhao Wang

引用次数: 9

Dynamic nonlinear algebraic models with scale-similarity dynamic procedure for large-eddy simulation of turbulence 湍流大涡模拟的尺度相似动态非线性代数模型

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2021-11-29 DOI: 10.21203/rs.3.rs-1078014/v1

Zelong Yuan, Yunpeng Wang, C. Xie, Jianchun Wang

{"title":"Dynamic nonlinear algebraic models with scale-similarity dynamic procedure for large-eddy simulation of turbulence","authors":"Zelong Yuan, Yunpeng Wang, C. Xie, Jianchun Wang","doi":"10.21203/rs.3.rs-1078014/v1","DOIUrl":"https://doi.org/10.21203/rs.3.rs-1078014/v1","url":null,"abstract":"A dynamic nonlinear algebraic model with scale-similarity dynamic procedure (DNAM-SSD) is proposed for subgrid-scale (SGS) stress in large-eddy simulation of turbulence. The model coefficients of the DNAM-SSD model are adaptively calculated through the scale-similarity relation, which greatly simplifies the conventional Germano-identity based dynamic procedure (GID). The a priori study shows that the DNAM-SSD model predicts the SGS stress considerably better than the conventional velocity gradient model (VGM), dynamic Smagorinsky model (DSM), dynamic mixed model (DMM) and DNAM-GID model at a variety of filter widths ranging from inertial to viscous ranges. The correlation coefficients of the SGS stress predicted by the DNAM-SSD model can be larger than 95% with the relative errors lower than 30%. In the a posteriori testings of LES, the DNAM-SSD model outperforms the implicit LES (ILES), DSM, DMM and DNAM-GID models without increasing computational costs, which only takes up half the time of the DNAM-GID model. The DNAM-SSD model accurately predicts plenty of turbulent statistics and instantaneous spatial structures in reasonable agreement with the filtered DNS data. These results indicate that the current DNAM-SSD model is attractive for the development of highly accurate SGS models for LES of turbulence.","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2021-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46480975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8