Article
Engineering, Aerospace
Jaideep Ray, Patrick Blonigan, Eric T. Phipps, Kathryn Maupin
Summary: This study investigates experimental datasets of laminar hypersonic flows over a double-cone geometry acquired in LENS-XX expansion tunnel. The datasets have not been accurately modeled and the authors suggest that this may be due to mis-specified inlet conditions. Bayesian inverse problem and deterministic inversion are employed to infer the inlet conditions and assess the uncertainty bounds. The results reveal discrepancies between the inferred inlet conditions and the stated conditions in the experiments.
Article
Engineering, Aerospace
Xinglian Yang, Jingying Wang, Yue Zhou, Ke Sun
Summary: Accurate prediction of the aerothermal environment during spacecraft reentry is crucial for space exploration and return missions. This study investigates the radiative transfer in the shock layer for hypervelocity reentry using a developed radiation-flowfield uncoupling method. The results show the significance of radiative heating and compare different models for predicting it.
Article
Engineering, Mechanical
Ali Riza Durmaz, Erik Natkowski, Nikolai Arnaudov, Petra Sonnweber-Ribic, Stefan Weihe, Sebastian Munstermann, Chris Eberl, Peter Gumbsch
Summary: This study proposes a validation framework where a fatigue test is simulated by embedding measured microstructures into the specimen geometry and adopting an approximation of the experimental boundary conditions. A phenomenological crystal plasticity model is applied to predict deformation in ferritic steel, and the hotspots in commonly used fatigue indicator parameter maps are compared with damage segmented from micrographs. The framework is published for benchmarking future micromechanical fatigue models.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Green & Sustainable Science & Technology
Tom M. L. Wigley, Sanghyun Hong, Barry W. Brook
Summary: The study evaluated three Integrated Assessment Models (IAMs) and found discrepancies in their predictions related to historical data and future scenarios. It was noted that mitigation technology failures varied greatly among the IAMs, suggesting the need for a more thorough examination of their projections. Recommendations included improving the availability of comprehensive model output for further analysis, ensuring consistent comparative scenarios for assessment, and conducting detailed inter-model comparisons for deeper insights into model credibility.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Luis H. Ortega, Kay L. Yee, Delia Perez-Nunez, Sean M. McDeavitt, Casey Steinman, Richard R. Schultz, Mary Lou Dunzik-Gougar, Benjamin W. Spencer
Summary: Fracture models are crucial in fuel performance codes due to their significant role in the behavior of ceramic fuel in a nuclear reactor environment. This study proposes using quenching as a simple method to approximate reactor conditions in a laboratory setting, and validates it through experiments and numerical simulations.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Engineering, Aerospace
Jiwon Son, Chankyu Son, Kwanjung Yee
Summary: This paper proposes a novel framework to directly optimize the waverider by adopting the osculating cone theory as an inverse design method and combining a high-fidelity computational fluid dynamics solver and a surrogate model for accurate and rapid performance estimation. The framework is applied to a multi-objective optimization problem to analyze the general characteristics of the waverider.
Article
Thermodynamics
N. Soares, N. Rosa, J. J. Costa, A. G. Lopes, T. Matias, P. N. Simoes, L. Duraes
Summary: This paper evaluates the thermal performance of PCM-based samples for building applications, comparing six numerical methods for simulating heat diffusion with solid-liquid phase-changes. The study concludes that the EHC method with triangular profiles is preferable for simulations due to its accuracy, simplicity, and computational efficiency.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Engineering, Mechanical
S. V. Lukashevich, S. O. Morozov, A. N. Shiplyuk
Summary: The effect of surfaces with streamwise microgrooves on the development of natural disturbances in a hypersonic boundary layer is experimentally studied. It is shown that the peak amplitude of the second-mode disturbances is much lower on the surface with microgrooves than on the solid surface, and the first-mode amplitude is always higher than that on the solid surface. The efficiency of stabilization of the second-mode disturbances depends on the groove depth and porosity, with the greatest effect of stabilization reached with the groove depth of about one quarter of the second-mode wavelength.
EXPERIMENTS IN FLUIDS
(2021)
Article
Engineering, Aerospace
Shuai-Qi Guo, Wen Liu, Chen-An Zhang, Xiang Zhou, Fa-Min Wang
Summary: The balance of lateral and directional static stability is crucial for the design of hypersonic vehicles. This study proposes simplified analytical models based on a simplified geometry model, which reveal that increasing the deflection angle, dihedral angle, or angle of attack enhances both lateral and directional stability. Viscous effects significantly improve lateral stability and also increase directional stability.
Article
Chemistry, Physical
E. Bremond, M. Rodriguez-Mayorga, A. J. Perez-Jimenez, C. Adamo, J. C. Sancho-Garcia
Summary: In this study, we have updated the Quadratic Integrand Double-Hybrid (QIDH) model by incorporating the nonempirical r(2)SCAN meta-generalized gradient approximation exchange-correlation functional. The new model shows a high level of accuracy and competitiveness in various types of non-covalent interactions.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Aerospace
Yoonsik Park, Junhyuk Nam, Yongsu Kim, Daeyong Jun, Bok Jik Lee, Yang Ji Lee
Summary: Various flow control devices, especially bleed systems, have been developed to suppress inlet unstart and reduce total pressure loss in hypersonic inlets. Numerical simulations are crucial for investigating the effectiveness of different bleed configurations, but predicting the flow structure and bleed effects is challenging due to factors such as shock-wave/boundary-layer interactions and compressibility effects. A numerical solver was developed and evaluated on validation cases, showing accurate results in flat plate flows but requiring turbulence corrections for rapid expansion or curved walls in hypersonic inlets. This paper provides best practices for hypersonic flow cases and can guide future numerical studies on hypersonic inlet boundary layer control.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Food Science & Technology
Jet Van De Steene, Joeri Ruyssinck, Juan-Antonio Fernandez-Pierna, Lore Vandermeersch, An Maes, Herman Van Langenhove, Christophe Walgraeve, Kristof Demeestere, Bruno De Meulenaer, Liesbeth Jacxsens, Bram Miserez
Summary: This study examines several analytical techniques, including Near Infrared (NIR) and Mid-Infrared (MIR) spectroscopy, Hyper Spectral Imaging (HSI), Gas Chromatography coupled to Mass Spectrometry (GC-MS) and Proton-transfer Reaction Time -of-Flight Mass spectrometry (PTR-TOF-MS), combined with chemometrics, to evaluate their potential in solving food authenticity questions, using rice as a case. The results show that GC-MS is the most accurate method for origin assessment, with prediction rates ranging from 86% to 94%, and data fusion experiments combining GC-MS with NIR or HSI resulted in prediction rates of more than 90%. For variety assessment, HSI achieved prediction values above 90% for all classes, and data fusion experiments combining GC-MS with NIR or HSI resulted in prediction values of 98%.
Article
Engineering, Aerospace
Aravinth Sadagopan, Daning Huang, Adam Jirasek, Juergen Seidel, Anshuman Pandey, Katya M. Casper
Summary: This paper investigates the fluid-thermal-structural interaction (FTSI) on a complex geometry in hypersonic flows and validates numerical frameworks against wind-tunnel data. The study reveals the presence of steady and unsteady characteristics in the flow and concludes that the interaction occurs mostly in a one-way coupled manner.
Article
Mechanics
Bingbing Wan, Guohua Tu, Xianxu Yuan, Jianqiang Chen, Yifeng Zhang
Summary: This study confirms the presence of traveling crossflow waves under real flight conditions by analyzing raw data from a model flight experiment, with the signals detected being in good agreement with predictions based on linear stability theory.
Article
Engineering, Aerospace
William C. Starshak, Stuart J. Laurence
Summary: A novel optical-tracking technique is proposed for aerodynamic measurements on free-flying models in hypersonic wind tunnels. The technique demonstrates submicron positional accuracy in calibrated bench-top experiments and achieves less than 1% uncertainty in drag measurements for a sphere and less than 4% uncertainty in lift measurements for a capsule in Mach 6 wind-tunnel experiments.