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Application of immersed boundary method in turbomachines

Chinese Journal of Aeronautics 2023年第5期36卷 268-279页

作者： Congcong CHEN Yuwei WANG Zhuo WANG Lin DU Xiaofeng SUN School of Energy and Power Engineering Beihang UniversityBeijing 100191China Research Institute of Aero-Engine Beihang UniversityBeijing 100191China

Simulating unsteady turbulent flow in turbomachines is still challenging due to the complexity of blade geometry and relative motion between rotor and *** study presents an Immersed Boundary Method(IBM)for high-Reynolds turbomachinery internal flows,and shows the advantage of the automatic grid generation techniques and flexible moving boundary *** wall functions are used in the present method to alleviate the wall resolution restriction of turbulence *** Two-Dimensional(2-D)IBM solver,which was previously developed and tested for a low-speed compressor,is further validated for a well-documented Low-Pressure Turbine(LPT)*** the blade loading and the total pressure losses in the wake are well captured by the present 2-D *** complex Three-Dimensional(3-D)effects in turbomachines motivate the further development of an extended 3-D IBM solver by using a curvilinear-coordinate system that facilitates the hub and casing boundary *** good performance of the 3-D solver is demonstrated through comparison with CFX solver solutions for the rotor configuration of Advanced Noise Control Fan(ANCF).Further effects of the grid resolution on capturing the blade wake are *** results indicate that the present 3-D solver is capable of reproducing the evolution of the blade wake with suitable computational grid.

关键词： Immersed boundary method Turbomachinery Turbulence simulation Wake prediction wall function

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NUMERICAL STUDY OF SEMI-CONFINED SLOT JET IMPINGEMENT

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Journal of Hydrodynamics 1999年第3期11卷 14-18页

作者： Xu Jing lei, Xu Zhong, Huang Shu juan Department of Fluid Engineering, Energy and Power School,Xi′an Jiaotong University, Xi′an 710049, P.R.China (Received June 1, 1998)

The standard k ε turbulence model in conjunction with the logarithmic law of the wall has been applied to the prediction of a fully developed turbulent slot impinging jet within a semi confined space. A single geometry with a Reynolds number of 10,000 and a nozzle to plate spacing of eight slot widths has been considered with inlet boundary conditions based on the previous calculated result of a fully developed turbulent 2 D flow. The numerical results of mean velocity agree with the experimental data. But the fluctuating velocity is somewhat poorly predicted. The difference between the numerical study and the experimental data is attributed directly to the turbulence model, and the application of the wall function.

关键词： slot impinging jet turbulence kε model wall function

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EFFECT OF wall FUNC TION IN NUMERICAL STUDY ON TURBULENT IMPINGING JET

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Transactions of Nanjing University of Aeronautics and Astronautics 2001年第1期18卷 29-34页

作者：徐惊雷徐忠黄淑娟张堃元南京航空航天大学能源与动力学院西安交通大学流体工程系

A low Reynolds number k-ε model is used in the numeri cal study on a circular semi-confined turbulent impinging jet . The result is c ompared with that of the standard k-ε model and a refined k-ε mode l, which re-consi-dered the fluctuating pressure diffusion term in the dissipa tion rate equation (ε-equation) through modeling. It shows that the low Re ynolds number k-ε model and the standard k-ε model yield very poor performance, while the predicting ability of the refined k-ε model is mu ch improved , especially for the turbulent kinetic energy k. So it can be co ncluded that the poor performance of the standard k-ε model is owing to t he incorrect considering the effect of the fluctuating pressure diffusion term r ather than the use of the wall function near the wall just as presumed in the re ference.

关键词： impinging jet turbulence fluctuating pressure diffusion term wall function

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Numerical Simulation of the 3D Viscous Flow Field over the Revolution Body

Numerical Simulation of the 3D Viscous Flow Field over the R...

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作者： QIU Liao-yuan, SHI Zhong-kun, ZHOU Ling, MA Yun-yi ( College of Traffic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China China Ship Development and Design Center, Wuhan 430064, China)

A mathematical model of the revolution body satisfied the principal dimensions and equilibrium condition of submarine is presented and numerical simulation calculation of the three-dimensional viscous flow field over the revolution body model established by the mathematical model is performed by solving RANS equations with κ - ε two equation turbulence model and finite volume method (FVM) in this paper. And a two-layer near-wall model is applied to enable the flow field of the near-wall region to be resolved with a more fine mesh. At the same time, numerical simulation calculation of the three-dimensional viscous flow field over the revolution body is also performed. The longitudinal distributions of pressure coefficient and skin friction coefficient, in addition to velocity profiles of different x/L locations, in the condition of different inlet velocities are presented. The comparison of the above distributions with the numerical results and test data provided by some references is also carried out in this paper. The comparison shows that computing results presented in this paper are very consistent with the numerical results and the test data provided by the references and even more close to the test data This provides an effectual computational method for numerical simulation of the flow field over dropping-shape submarine and resistance prediction.

关键词： ship engineering revolution body 3D viscous flow field numerical simulation wall function dripping- shape submarine

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