Article
Mechanics
A. Nawab, L. diMare
Summary: This paper investigates the volume-averaged flowfield in a regular array of cylinders using scale-resolving computations, analyzing the macroscopic turbulent kinetic energy conservation law. The results show that the macroscopic velocity profiles are similar to the canonical turbulent channel flow profiles, but with different parameter values. The production rate of volume-averaged TKE stays large throughout the domain, unlike in channel flow where it attenuates rapidly after a near-wall peak.
Article
Energy & Fuels
Guoqiang Xiong, Gesheng Li, Weilin Zeng, Junjie Liang
Summary: The steady flamelet method was used in the large eddy simulation (LES) of turbulent cool flames to investigate its capability. The results showed that it accurately captured the mean and variance trends for temperature, mixture fraction, and formaldehyde, as well as described the flame morphology of the two-stream flamelet form.
Article
Engineering, Marine
Elizaveta Ivashchenko, Mikhail Hrebtov, Mikhail Timoshevskiy, Konstantin Pervunin, Rustam Mullyadzhanov
Summary: The study presents results of Large-eddy simulations (LES) modeling of cavitation on a hydrofoil, validated against Particle image velocimetry (PIV) data. It proposes a new methodology based on conditional averaging of the velocity fields to match averaged velocity distributions and shows good agreement between experimental and numerical results. The benefits of second-order discretization schemes over lower-order schemes are highlighted.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Environmental
Antonella Succar, Xavier Lefebvre, Michele Prevost, Emilie Bedard, Etienne Robert
Summary: This study characterizes the size and trajectory of water droplets generated from aerated water jets, finding four categories of droplets based on their movement. The research reveals the potential infection risk for vulnerable individuals near the sink and provides insights into the fate of these droplets in the sink environment through numerical modeling.
Article
Thermodynamics
Mostafa Esmaeili, Asghar Afshari
Summary: This study numerically investigates the flow features and mixing/combustion efficiencies in a turbulent reacting jet in cross-flow using a hybrid Eulerian-Lagrangian methodology. The findings show that the main features of a reacting JICF flame can be reproduced by the large-eddy simulation (LES)/FMDF method, and increasing the momentum ratio improves mixing and combustion efficiency.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Computer Science, Interdisciplinary Applications
Ashutosh Kumar Jaiswal, Anupam Dewan, Amitabh Bhattacharya
Summary: Scale-resolving hybrid RANS-LES models are efficient and accurate for numerically simulating wall-bounded turbulent flows. The interpolated RANS-LES solver, implemented in OpenFOAM, simultaneously evolves the RANS equations and LES equations on the same computational grid. By interpolating the turbulent eddy-viscosity, the solver corrects the mean subgrid stress and accurately predicts resolved Reynolds stresses.
COMPUTERS & FLUIDS
(2023)
Article
Computer Science, Interdisciplinary Applications
Nicolas Odier, Adrien Thacker, Mael Harnieh, Gabriel Staffelbach, Laurent Gicquel, Florent Duchaine, Nicolas Garcia Rosa, Jens-Dominik Mueller
Summary: A mesh adaptation methodology for wall-modeled turbomachinery LES is proposed, which considers both the average kinetic energy dissipation rate and the normalized wall distance y(+). The method is tested on a highly loaded transonic blade and a real turbofan stage, showing good prediction capability for boundary layer transition and recirculation bubble. Comparison with experimental data and hot-wire anemometry confirms the efficiency of the proposed adaptation method.
COMPUTERS & FLUIDS
(2021)
Article
Mechanics
Rodrigo S. Mitishita, Gwynn J. Elfring, Ian A. Frigaard
Summary: This study experimentally investigates the behavior of a wormlike micellar solution that forms a gel at room temperature in turbulent flow and compares it with other fluids. The results show that the gel-like structure of the solution is mostly broken down during turbulence, low concentrations of surfactant exhibit Newtonian-like flow field, and high concentrations lead to drag reduction and lower power spectral densities.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2022)
Article
Optics
Arasad Ali Khan, H. L. Yadav
Summary: Improper optical design and aberrations in optical components of a dual-beam differential LDA system result in non-uniform fringe spacing and inaccurate measurements. To improve measurement accuracy, fringe spacing should be optimized for particle concentration and size. The use of a four-hololens imaging system eliminates aberrations and allows for optimized fringe formation based on different particle conditions.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Automation & Control Systems
Xiaotong Ren, Shengqiang Shen, Yong Yang, Hui Lv, Yali Guo
Summary: In this research, numerical simulations of a turbulent round jet were performed using large eddy simulation (LES) and the results were compared to Reynolds-averaged Navier-Stokes (RANS). The turbulence statistics are independent of the Reynolds number for Re >= 1104. A three-dimensional turbulent round jet near the exit, with a Reynolds number of 6.2104, was simulated to better represent real-world engineering applications. The comparison of LES and RANS turbulence models with experimental data showed that LES provides more accurate predictions of the core area and length of the jet core, and its turbulence statistics agree with experimental results.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Review
Thermodynamics
Lixing Zhou, Yang Liu, Fang Wang, Liyuan Hu, Ke Li, Kun Luo
Summary: This paper reviews the application of the second-order moment (SOM) combustion model in large-eddy simulation (LES) of two-phase combustion. It includes the description of the SOM-LES model, its application, validation of statistical results by experiments, as well as the phenomena obtained by instantaneous results.
JOURNAL OF THERMAL SCIENCE
(2023)
Article
Mechanics
Rodrigo S. Mitishita, Gwynn J. Elfring, Ian. A. Frigaard
Summary: In this study, the effects of flexible and rigid polymer solutions on turbulent drag reduction in a 2:1 aspect ratio rectangular duct were investigated experimentally. The results showed that both xanthan gum (XG) and partially hydrolysed polyacrylamide (HPAM) had similar effects on turbulence at similar Reynolds numbers and drag reduction percentages. At high drag reduction levels, the power spectral densities of streamwise velocity fluctuations exhibited a power-law decay near -3, indicating the presence of elasto-inertial turbulence (EIT). Additionally, the flexible polymer solutions were found to be more effective at reducing drag at relatively low concentrations compared to XG.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Xuejun Qin, Jun Yang, Junyi Guan, Zhen Liao, Yanjun Ma, Dezhi Zhang
Summary: This paper studied the deformation of a steel cylindrical shell under internal explosion and proposes a new method for measuring shell deformation by PDV. The vibration period of the outer cylindrical shell and the time for reflection of the stress wave in the outer cylindrical shell were obtained by numerical simulation and PDV measurement, respectively. Through the above research, the structural response of the multilayer cylinders can be obtained, which can provide further help with research of the structural design of multilayer cylinders.
APPLIED SCIENCES-BASEL
(2023)
Article
Thermodynamics
Yicun Wang, Changxiao Shao, Kun Luo, Ruipeng Cai, Tai Jin, Jianren Fan
Summary: In this paper, the authors focus on the development and validation of the TSFPV model for simulating turbulent spray flames. The improved SEST model is used to generate the spray flamelet library, and the TSFPV model is verified on different flame configurations. The results show good agreement with experimental measurements, indicating the potential of the TSFPV model for spray combustion modeling.
Article
Mechanics
Gazi Hasanuzzaman, Sebastian Merbold, Vasyl Motuz, Christoph Egbers
Summary: Investigated the use of uniform blowing as an active flow control method in a zero pressure gradient turbulent boundary layer over a flat plate, measurement data obtained with Laser Doppler Anemometry technique, measurements taken at different Reynolds numbers.
JOURNAL OF TURBULENCE
(2022)
