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A numerical investigation on a low-speed linear cascade has been done to study the impact of sweep applied at the tip of a turbine rotor blade on tip leakage flow. Two forward and two backward swept blade tip modifications have been applied to the T106 profile to create new blade cascade configurations. The aim of applying sweep to the blade’s tip is an attempt to reduce tip losses. This can be achieved by reducing the leakage mass flow rate or by altering the leakage flow to reduce the leakage vortex strength, which is the main contributor to tip losses. A detailed comparison of the tip...
One of the most important parameters when using a 2-fluid model to analyze the critical heat flux (CHF) performance of a mixing grid is the interfacial area term. This term is responsible for the rate of phase change and the amount of thermal and mechanical interaction between phases. Accurate closure relations for this term are not fully developed for flow conditions in a rod bundle that contain spacers with mixing vanes and simple support grids. Using the OECD/NRC, Nuclear Power Engineering Corporation (NUPEC) PWR Bundle Tests (PSBT) 5x5 rod bundle steady-state average void fractions are...
A significant body of current research is aimed at developing methods for numerical simulation of flow and transport in porous media that explicitly resolve complex pore and solid geometries, and at utilizing such models to study the relationships between fundamental pore-scale processes and macroscopic manifestations at larger (i.e., Darcy) scales. A number of different numerical methods for pore-scale simulation have been developed, and have been extensively tested and validated for simplified geometries. However, validation of pore-scale simulations of fluid velocity for complex, three-...
Using experimental data from a study of flow over a wall-mounted square cylinder (h=4d) as a baseline, three Reynolds-Averaged Navier-Stokes turbulence models are used in a commercial CFD code Star-CCM+ to compare the relative accuracy of the tested models. In virtually every standard of comparison applied in this study, the Realizable κ−ε with a two-layer treatment proved to be far superior to both the κ−ε V2F (All y+ hybrid wall treatment) and the κ−ω models. To observe mesh dependence for each of the models, all three were run on three different polyhedral mesh cases. Resulting first prism...
Virtual Vehicle Thermal Management System Analysis for Component Temperature Prediction
Digital prototypes allow engineers to simulate systems within the early phase of vehicle design. The virtual vehicle can examine real-world tasks using simulation. Complex drive cycle studies are being conducted with these digital simulations to look at peak temperature during operation and where these peak temperatures occur. This can be done early in the design phase, reducing both the cost and time of requiring physical hardware to be made and tested. CD-adapco has been involved with simulating vehicle systems for over 20 years. The simulation has matured over this period from initially...
Aeroacoustics: Computational Aeroacoustics for Aerospace
대도시와 공항의 확장과 이로 인한 항공 교통의 증가로 나타난 항공기의 소음은 오늘날 항공 산업에서 직면한 가장 큰 문제 중 하나가 되었습니다. 시뮬레이션 기술은 향상된 알고리즘과 계산 능력 때문에 현재 공력 소음 분야에 널리 적용되고 있으며 소음원 매커니즘과 음향 전파를 해석하기에 더욱 수월해졌습니다. 이런 시뮬레이션 기술을 이용해 소음을 줄이기 위한 방법을 찾고자 합니다. 본 웹캐스트에서는 환경 제어 시스템(ECS). 항공전자기기의 냉각, 추진 장치, 그리고 기체 소음(착륙장치, 고양력 장치, 날개 뒷전, 기타) 에 관한 어플리케이션을 보여드립니다. 주요 시연 기술: 압축성 유동 해석 기법을 통한 근거리 소음 전파 해석 파수(wave number) 푸리에 분석 기법 FWH 등의 전파 소음 해석 모델

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