Review
Mechanics
Mori Mani, Andrew J. Dorgan
Summary: In this review, the increasing use of computational fluid dynamics in the aerospace industry for designing and studying aircraft is discussed. The importance of geometry, turbulence models, numerical algorithms, mesh adaptation, and design optimization is highlighted. Challenges and suggestions for investment in each area are provided. The review concludes by envisioning a future where certification by analysis and model-based design are standard practices, and emphasizing the necessary steps to lead the industry in that direction.
ANNUAL REVIEW OF FLUID MECHANICS
(2023)
Article
Automation & Control Systems
Sundar Marimuthu, Bethan Smith
Summary: This study investigates the application of water-jet guided (WJG) laser and quasi-continuous wave (QCW) millisecond pulse fibre laser in drilling acute angular holes on TBC coated nickel superalloy. Experimental results show that the quality of WJG laser drilling is comparable to cold-ablation process, with high-temperature zone confined within a small laser irradiation area, helping to avoid coating delamination commonly observed in long pulse acute angle laser drilling processes.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Boshen Liu, Fei Ma
Summary: The research investigated the erosion behavior of pure aluminum by an inclined cavitating jet through experiments and numerical simulations. Results showed that increasing the inclined impingement angle led to higher erosion ratio, with different erosion patterns under various feeding pressures. Erosion under inclined impingement exhibited distinct ring-shaped and crescent-shaped features, indicating a transition from plastic deformation to erosion damage along the erosion boundary.
Article
Engineering, Aerospace
Enwei Lu, Linxuan Zuo, Zheng Guo, Honggang Zeng, Wei Zhu, Feng Qu
Summary: This study conducted a flight test to validate the accuracy of prediction technology for aerodynamic heating/force loads, and promoted the development of drag and heat reduction technology. The results indicated significant numerical errors in most cases, suggesting the need for more technologies to be adopted for further research.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Thermodynamics
Ahmet Umit Tepe
Summary: This study numerically investigates staggered array jet impingement cooling on a semi-circular concave surface. The results show that elongating jet holes can significantly enhance heat transfer, and decreasing the gap between jet nozzle and target plate improves heat transfer efficiency.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Engineering, Aerospace
Joshua D. Blake, Adrian Sescu, David Thompson, Yuji Hattori
Summary: This study introduces the coupled LES-synthetic turbulence (CLST) model, which resolves large-scale turbulent fluctuations from LES and models small-scale fluctuations using the synthetic eddy method to predict jet noise. The noise is calculated using the linearized Euler equations, with the rolling and stretching of synthetic eddies taken into account by convection with the large-scale turbulent scales. The results show that the CLST method is able to recover the filtered high-frequency content, agreeing well with the LES spectra, and has the potential to simulate the high-frequency range in the acoustic noise spectrum at a reasonable cost.
Article
Engineering, Aerospace
Jun Kang, Zhi Xiong, Rong Wang, Bing Hua
Summary: This paper proposes a resilient multi-source fusion integrated navigation method based on comprehensive information evaluation. By combining qualitative analysis and quantitative analysis, a multi-layer evaluation framework for redundant information is established, improving the reliability of the navigation system. Through quantitative analysis of redundant information and qualitative analysis of navigation output effectiveness, the fusion accuracy is enhanced. Finally, by mutual correction of multi-level information evaluation results, the system robustness is improved.
Article
Engineering, Mechanical
Lingkang Meng, Yuchuan Zhu, Defa Wu, Jianjun Ding
Summary: This study conducts experimental analysis and simulation to investigate the performance of the jet pipe servo valve (JPSV) before and after wedge erosion. The results show that the dynamic behavior of the JPSV degrades gradually and non-linearly with the increase of erosion degree of the wedge. The critical factor causing the performance deterioration is revealed to be the weakened shunting effect and significant changes in the flow field of the jet amplifier after wedge erosion.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Chemical
Kizuku Kushimoto, Kaya Suzuki, Shingo Ishihara, Rikio Soda, Kimihiro Ozaki, Junya Kano
Summary: The collision behaviors of particles in spiral jet milling were analyzed using a simulation that tracked particle motion with the discrete element method (DEM) and represented air flow with computational fluid dynamics (CFD). The DEM and CFD were coupled with a one-way coupling method. The simulated air flow was validated by comparing it with the measured fluid velocity field in a model experiment. The air flow and particle behaviors in a commercially used spiral jet mill were also analyzed using the simulation, revealing that particles in a region balancing centrifugal and radial drag forces were mainly ground by high-speed collisions near the top and bottom walls of the grinding chamber.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Bo Huang, Zhongyan Liu, Yujing Xu, Qiaochu Ding, Mengchun Pan, Jiafei Hu, Qi Zhang
Summary: This study conducts a numerical simulation of underwater vehicle wake magnetic field using dynamic overlapping mesh technology, and analyzes its formation, evolution, time-frequency characteristics, and the effects of navigation speed and acceleration.
APPLIED SCIENCES-BASEL
(2022)
Article
Thermodynamics
Fatih Demir, Oguz Turgut, Tamer Calisir
Summary: The flow field and heat transfer of a swirling jet under low nozzle-to-plate distances were numerically investigated using various turbulence models. The effects of Reynolds number and dimensionless nozzle-to-plate distance on the flow field and heat transfer were analyzed. The results showed that the height of the computational domain defined on the impingement plate significantly influenced the results, particularly at low nozzle-to-plate distances. The agreement between one of the cases and experimental results was observed when using the Realizable k-e turbulence model. The parametric analysis revealed that the theoretical swirl number decreased as Reynolds number increased at a constant nozzle-to-plate distance, but increased for nozzle-to-plate distances below 0.75. The pressure peaks and subatmospheric pressure on the impingement plate varied with the nozzle-to-plate distance and Reynolds number.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Engineering, Aerospace
Wutekuer Nuermaimaiti, Xuewu Liu, Pengze Yan, Zongrui Wang, Dapen Hu
Summary: Based on active flow control technology, this paper investigates the output characteristics of wall jets and the performance of a disc-type jet oscillator. Through experiments and simulations, it is found that the disc jet oscillator with a double-bend inlet and a multi-pipe outlet structure exhibits satisfactory oscillation performance.
CHINESE JOURNAL OF AERONAUTICS
(2023)
Article
Chemistry, Multidisciplinary
Yiran Liu, Boyi Chen, Jinbao Chen, Yanbin Liu
Summary: This paper investigates a rapid modeling method and robust analysis of hypersonic vehicles using multidisciplinary integrated techniques. First, the geometrical configuration is described using parametric methods based on the class-shape technique. Aerodynamic forces and moments are estimated for the specific configuration using engineering methods. Moreover, the nonlinear model is simplified by the polynomial fitting expressions, and the linear variable parameter model is obtained for the tracking control design and dynamic characteristic analysis with the aid of the sensitivity analysis and gap metric methods. A velocity-driven trajectory design method is deduced for hypersonic ascent, and the tracking control law is developed to realize the flight process from the initial point to the cruise point. Furthermore, a robust analysis process based on gap margin is proposed for climb trajectory tracking. Simulation results are provided to verify the feasibility of the proposed modeling method and show that the flight control of a hypersonic vehicle is more sensitive to altitude variation.
APPLIED SCIENCES-BASEL
(2023)
Article
Thermodynamics
B. Gungordu, M. Jabbal, A. A. Popov
Summary: In this study, the coupled structural-fluidic-acoustic modelling of piezoelectric diaphragm driven synthetic jet actuators is conducted computationally for the first time to demonstrate the importance of piezoelectric diaphragm structural modelling and the effects of acoustics coupling on the accuracy of synthetic jet exit jet velocity.
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
(2023)
Article
Engineering, Aerospace
Jun Kang, Zhi Xiong, Rong Wang, Ling Zhang
Summary: This paper proposes a multi-layer, fault-tolerant robust filtering algorithm of aerospace vehicle in the launch inertial coordinate system to improve the navigation accuracy and enhance the fault tolerance and robustness of the filtering algorithm.
Article
Mechanics
A. Gnanaskandan, K. Mahesh
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2015)
Article
Engineering, Marine
Krishnan Mahesh, Praveen Kumar, Aswin Gnanaskandan, Zane Nitzkorski
JOURNAL OF SHIP RESEARCH
(2015)
Article
Mechanics
Aswin Gnanaskandan, Krishnan Mahesh
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2016)
Article
Mechanics
Aswin Gnanaskandan, Krishnan Mahesh
JOURNAL OF FLUID MECHANICS
(2016)
Article
Chemistry, Physical
Aswin Gnanaskandan, Josette Bellan
JOURNAL OF SUPERCRITICAL FLUIDS
(2018)
Article
Mechanics
Georges L. Chahine, Aswin Gnanaskandan, Amir Mansouri, Chao-Tsung Hsiao, Romain Content
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2019)
Article
Acoustics
Aswin Gnanaskandan, Chao-Tsung Hsiao, Georges Chahine
ULTRASOUND IN MEDICINE AND BIOLOGY
(2019)
Article
Acoustics
Aswin Gnanaskandan, Chao-Tsung Hsiao, Georges Chahine
Summary: This study numerically investigates the impact of the viscoelastic shell properties of ultrasound contrast agents on heat deposition in bubble enhanced high intensity focused ultrasound (HIFU). Three different shell models are considered and their effects on heat deposition are analyzed. The importance of modeling shell elasticity is discussed through comparisons between Newtonian and non-Newtonian shell models, and a parametric study varying shell properties is conducted to examine the roles of shell viscosity and elasticity in affecting heat deposition.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Engineering, Mechanical
Jingsen Ma, Aswin Gnanaskandan, Chao-Tsung Hsiao, Georges L. Chahine
Summary: This study uses a coupled Euler-Lagrange model to investigate the application of microbubble enhanced high intensity focused ultrasound in tumor treatment, proposing a message passing interface parallelization scheme based on domain decomposition for accelerating computations. The special utilization of ghost cells surrounding boundaries allows bubbles to effectively spread void fraction effects across different subdomains without the need for direct bubble information exchange.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Aerospace
Andre F. P. Ribeiro, Carlos Ferreira, Damiano Casalino
Summary: This study compares a filament-based free wake panel method to experimental and validated numerical data in order to simulate propeller slipstreams and their interaction with aircraft components. The results show that the free wake panel method is able to successfully capture the slipstream deformation and shearing, making it a useful tool for propeller-wing interaction in preliminary aircraft design.
AEROSPACE SCIENCE AND TECHNOLOGY
(2024)
