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Riccardo Toracchio, Fabrizio Fontaneto and Koen Hillewaert
This paper presents the numerical characterization of a highly loaded compressor by means of 3D unsteady RANS simulations. The focus is on critical flow structures and their evolution at different operating points of the machine. First, the numerical set...
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Gustavo Lopes, Loris Simonassi and Sergio Lavagnoli
The aerodynamics of a high-speed low-pressure turbine (LPT) cascade were investigated under steady and unsteady inlet flows. The tests were performed at outlet Mach (M) and Reynolds numbers (Re" role="presentation">????Re
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) of 0.90" role="presentatio...
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Shaobai Li, Caixia Li and Wei Wang
The unsteady motion behavior of oil/gas two-phase flow in a novel ventless bearing chamber has significant impacts on the lubrication and heat transfer efficiency of bearings due to the various advantages of lower pressure levels and weaker rotating airf...
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Ji Pei, Fan Zhang, Desmond Appiah, Bo Hu, Shouqi Yuan, Ke Chen and Stephen Ntiri Asomani
This paper seeks to predict the performance of the side channel pump by considering the influences of different wrapping angles. Firstly, three pump cases 1, 2 and 3 are modeled with wrapping angles 15°, 30° and 45°, respectively. Secondly, different phy...
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Changli Hu, Guanghao Chen, Long Yang and Guoyu Wang
In this paper, the turbulent attached cavitating flows around two different twisted hydrofoils, named as NACA0009 and Clark-y, are studied numerically, with emphasis on cavity shedding dynamic behavior and the turbulence flow structures. The computationa...
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Simone Salvadori, Massimiliano Insinna and Francesco Martelli
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Reza Farshad, Seyed Mahmood Kashefipour, Mehdi Ghomeshi and Giuseppe Oliveto
Spur dikes are river protection structures typically used for flow diversion from erodible banks. However, scouring might be a severe problem that compromises their stability and, consequently, their hydraulic function. This paper aims to study the maxim...
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Weimin Bao, Junwei Zhou, Xiaohua Xiang, Peng Jiang and Muxi Bao
As a critical parameter of the steady uniform friction model, the roughness coefficient changes with flow unsteadiness in flood events; i.e., the flow conditions of the stream segment significantly affect the flow resistance. In this study, a modified fo...
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Yufei Ding, Yong Liu, Xingnian Liu, Ridong Chen and Songdong Shao
In engineering practice, the unsteady flows generated from the operation of hydropower station in the upstream region could significantly change the navigation system of waterways located in the middle-lower reaches of the river. In order to study the co...
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Yufei Ding, Yong Liu, Xingnian Liu, Ridong Chen, Songdong Shao
Pág. 1 - 18
In engineering practice, the unsteady flows generated from the operation of hydropower station in the upstream region could significantly change the navigation system of waterways located in the middle-lower reaches of the river. In order to study the co...
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Dimitris Ntouras and George Papadakis
Modeling free surface flows in a CFD context typically requires an incompressible approach along with a formulation to account for the air?water interface. Commonly, pressure-correction algorithms combined with the Volume of Fluid (VOF) method are used t...
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Alexey Savitskii, Dmitriy Sharaborin, Leonid Chikishev and Vladimir Dulin
Swirling flows often occur in nature and industrial applications. With an increase in swirl intensity, such rotating flows are known to become unstable and undergo a sudden breakdown of the vortex core, resulting in unsteady flow dynamics with intensive ...
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Rashid Ali and Nadeem Hasan
In the present study, numerical simulations are performed to identify the role of Reynolds number (Re), Richardson number (Ri) and free-stream orientations (a) on flow structures, aerodynamic parameters and heat transfer characteristics for the condition...
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Min Son, Michael Börner, Wolfgang Armbruster and Justin S. Hardi
To investigate a hypothesis of the orifice flow-induced instability in rocket engine thrust chambers, a single liquid oxygen (LOX) injector with an optically accessible orifice module was used for experiments, with water as a simulant for LOX. The unstea...
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Filippo Merli, Nicolas Krajnc, Asim Hafizovic, Marios Patinios and Emil Göttlich
The purpose of the paper is to characterize the aerodynamic behavior of a rotor-downstream hub cavity rim seal in a high-pressure turbine (HPT) stage. The experimental data are acquired in the Transonic Test Turbine Facility at the Graz University of Tec...
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Hao Wang, Jian Feng, Keyang Liu, Xi Shen, Bin Xu, Desheng Zhang and Weibin Zhang
To study instability in the unsteady cavitating flow in a liquid rocket engine inducer, visualization experiments of non-cavitating and cavitating flows inside a model inducer were carried out at different flow conditions. Visual experiments were carried...
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Abdus Samad,A. Husain,M. Zunaid,A. Samad
Pág. 191 - 205
The current study presents three-dimensional modeling and analysis of blood flow through artery stenosis under several variants of pulsatile flow to mimic the atherosclerosis artery disease. The study considered Newtonian and non-Newtonian blood flow mod...
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Dimitris Fotakis, Epameinondas Sidiropoulos and Athanasios Loukas
Watershed simulation software used for operational purposes must possess both dependability of results and flexibility in parameter selection and testing. The UBC watershed model (UBCWM) contains a wide spectrum of parameters expressing meteorological, g...
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Lu Jia, Yongzhong Zeng, Xiaobing Liu, Wanting Huang and Wenzhuo Xiao
During the flood season, Francis turbines often operate under low-head and full-load conditions, frequently experiencing significant pressure pulsations, posing potential threats to the safe and stable operation of the units. However, the factors contrib...
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Álvaro Muñoz and Pablo García-Fogeda
This paper compares various procedures for determining the optimal control law for a wing section in compressible flow. The flow regime includes subsonic, sonic and supersonic flows. For the evolution of the system in the Laplace plane, the present metho...
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