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Journal articles on the topic 'RANS solver Development'

Author: Grafiati

Published: 6 September 2023

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1

Xiao, Yinli, Zupeng Wang, Zhengxin Lai, and Wenyan Song. "Modeling of Spray Combustion with a Steady Laminar Flamelet Model in an Aeroengine Combustion Chamber Based on OpenFOAM." International Journal of Aerospace Engineering 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/7329564.

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The development of high-performance aeroengine combustion chambers strongly depends on the accuracy and reliability of efficient numerical models. In the present work, a reacting solver with a steady laminar flamelet model and spray model has been developed in OpenFOAM and the solver details are presented. The solver is firstly validated by Sandia/ETH-Zurich flames. Furthermore, it is used to simulate nonpremixed kerosene/air spray combustion in an aeroengine combustion chamber with the RANS method. A comparison with available experimental data shows good agreement and validates the capability

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Frey Marioni, Yuri, Enrique Alvarez de Toledo Ortiz, Andrea Cassinelli, Francesco Montomoli, Paolo Adami, and Raul Vazquez. "A Machine Learning Approach to Improve Turbulence Modelling from DNS Data Using Neural Networks." International Journal of Turbomachinery, Propulsion and Power 6, no. 2 (2021): 17. http://dx.doi.org/10.3390/ijtpp6020017.

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In this paper, we investigate the feasibility of using DNS data and machine learning algorithms to assist RANS turbulence model development. High-fidelity DNS data are generated with the incompressible Navier–Stokes solver implemented in the spectral/hp element software framework Nektar++. Two test cases are considered: a turbulent channel flow and a stationary serpentine passage, representative of internal turbo-machinery cooling flow. The Python framework TensorFlow is chosen to train neural networks in order to address the known limitations of the Boussinesq approximation and a clustering b

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Feng, Xing, and Wanqing Wu. "Generation of Water Waves Using Momentum Source Wave-Maker Applied to a RANS Solver." Mathematical Problems in Engineering 2019 (May 5, 2019): 1–11. http://dx.doi.org/10.1155/2019/1308960.

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Nowadays, as the development of Computational Fluid Dynamics (CFD) and the numerical wave tank (NWT) has advanced, numerical analysis has become increasingly useful and powerful for the ship designing and ship hydrodynamics. In this study, a momentum source wave-maker and an analytical relaxation wave absorber were embedded into 2D RANS equation model with RSM turbulence closure scheme to establish the NWT for ship designing and hydrodynamics. The VOF (volume-of-fluid) method was applied to accurately capture the water free surface. The body force-weighted scheme is chosen for pressure interpo

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Han, Han, Zifei Yin, Yijun Ning, and Hong Liu. "Development of a 3D Eulerian/Lagrangian Aircraft Icing Simulation Solver Based on OpenFOAM." Entropy 24, no. 10 (2022): 1365. http://dx.doi.org/10.3390/e24101365.

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A 3D icing simulation code is developed in the open-source CFD toolbox OpenFOAM. A hybrid Cartesian/body-fitted meshing method is used to generate high-quality meshes around complex ice shapes. Steady-state 3D Reynolds-averaged Navier-Stokes (RANS) equations are solved to provide the ensemble-averaged flow around the airfoil. Considering the multi-scale nature of droplet size distribution, and more importantly, to represent the less uniform nature of the Super-cooled Large Droplets (SLD), two droplet tracking methods are realized: the Eulerian method is used to track the small-size droplets (b

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Bradstock, Philip, and Wolfgang Schlez. "Theory and verification of a new 3D RANS wake model." Wind Energy Science 5, no. 4 (2020): 1425–34. http://dx.doi.org/10.5194/wes-5-1425-2020.

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Abstract. This paper details the background to the WakeBlaster model: a purpose-built, parabolic three-dimensional RANS solver, developed by ProPlanEn. WakeBlaster is a field model, rather than a single turbine model; it therefore eliminates the need for an empirical wake superposition model. It belongs to a class of very fast (a few core seconds, per flow case) mid-fidelity models, which are designed for industrial application in wind farm design, operation, and control. The domain is a three-dimensional structured grid, a node spacing of a tenth of a rotor diameter, by default. WakeBlaster u

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Liu, Junwei, Shuiyue Chen, Xin Li, and Zuodong Liang. "Three-Dimensional Modelling of Non-Linear Wave-Induced Seabed Response around Offshore Open-Ended Pile." Journal of Marine Science and Engineering 9, no. 11 (2021): 1238. http://dx.doi.org/10.3390/jmse9111238.

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This paper analyses the fluid–seabed–structure interactions (FSSI) around the open-ended pile by applying the in-house solver established on the open-source Computational Fluid Dynamics (CFD) platform. The Reynolds-averaged Navier–Stokes (RANS) equations are solved to simulate the hydrodynamic interactions between waves and open-ended piles. Biot’s poro-elastic theory (quasi-static model) is used to reproduce the wave-induced seabed responses. The parameter analysis indicates that the wave period, degree of saturation of seabed and pile diameter have a great influence on the development of the

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Prospathopoulos, John, and Spyros G. Voutsinas. "Implementation Issues in 3D Wind Flow Predictions Over Complex Terrain." Journal of Solar Energy Engineering 128, no. 4 (2006): 539–53. http://dx.doi.org/10.1115/1.2346702.

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Practical aspects concerning the use of 3D Navier-Stokes solvers as prediction tools for micro-siting of wind energy installations are considered. Micro-siting is an important issue for a successful application of wind energy in sites of complex terrain. There is a constantly increasing interest in using mean wind flow predictions based on Reynolds averaged Navier-Stokes (RANS) solvers in order to minimize the number of required field measurements. In this connection, certain numerical aspects, such as the extent of the numerical flow domain, the choice of the appropriate inflow boundary condi

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Tahara, Y., F. Stern, and Y. Himeno. "Computational Fluid Dynamics–Based Optimization of a Surface Combatant." Journal of Ship Research 48, no. 04 (2004): 273–87. http://dx.doi.org/10.5957/jsr.2004.48.4.273.

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Computational fluid dynamics (CFD)-based optimization of a surface combatant is presented with the following main objectives:development of a high-performance optimization module for a Reynolds averaged Navier-Stokes (RANS) solver for with-free-surface condition; anddemonstration of the capability of the optimization method for flow- and wave-field optimization of the Model 5415 hull form. The optimization module is based on extension of successive quadratic programming (SQP) for higher-performance optimization method by introduction of parallel computing architecture, that is, message passing

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Tahara, Yusuke, Koji Norisada, Michitaka Yamane, and Tomohiro Takai. "Development and Demonstration of CAD/CFD/Optimizer Integrated Simulation-Based Design Framework by Using High-Fidelity Viscous Free-Surface RaNS Equation Solver." Journal of the Japan Society of Naval Architects and Ocean Engineers 7 (2008): 171–84. http://dx.doi.org/10.2534/jjasnaoe.7.171.

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10

Masoomi, Mobin, Mahdi Yousefifard, and Amir Mosavi. "Efficiency Assessment of an Amended Oscillating Water Column Using OpenFOAM." Sustainability 13, no. 10 (2021): 5633. http://dx.doi.org/10.3390/su13105633.

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Oscillating water column (OWC) is an advanced form of wave energy converter (WEC). This study aims at improving the efficiency of an amended OWC through a novel methodology for simulating several vertical plates within the chamber. This paper provides a numerical investigation considering one, two, three, and four vertical plates. The open field operation and manipulation (OpenFOAM) solver is verified based on the Reynolds-Averaged Navier–Stokes (RANS) equation. Results show the number and the position of plates where the convertor’s efficiency improves. The work undertaken here also revealed

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Madsen, Mads H. Aa, Frederik Zahle, Niels N. Sørensen, and Joaquim R. R. A. Martins. "Multipoint high-fidelity CFD-based aerodynamic shape optimization of a 10 MW wind turbine." Wind Energy Science 4, no. 2 (2019): 163–92. http://dx.doi.org/10.5194/wes-4-163-2019.

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Abstract. The wind energy industry relies heavily on computational fluid dynamics (CFD) to analyze new turbine designs. To utilize CFD earlier in the design process, where lower-fidelity methods such as blade element momentum (BEM) are more common, requires the development of new tools. Tools that utilize numerical optimization are particularly valuable because they reduce the reliance on design by trial and error. We present the first comprehensive 3-D CFD adjoint-based shape optimization of a modern 10 MW offshore wind turbine. The optimization problem is aligned with a case study from Inter

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Cassinelli, Andrea, Andrés Mateo Gabín, Francesco Montomoli, Paolo Adami, Raul Vázquez Díaz, and Spencer J. Sherwin. "Reynolds Sensitivity of the Wake Passing Effect on a LPT Cascade Using Spectral/hp Element Methods." International Journal of Turbomachinery, Propulsion and Power 7, no. 1 (2022): 8. http://dx.doi.org/10.3390/ijtpp7010008.

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Reynolds-Averaged Navier–Stokes (RANS) methods continue to be the backbone of CFD-based design; however, the recent development of high-order unstructured solvers and meshing algorithms, combined with the lowering cost of HPC infrastructures, has the potential to allow for the introduction of high-fidelity simulations in the design loop, taking the role of a virtual wind tunnel. Extensive validation and verification is required over a broad design space. This is challenging for a number of reasons, including the range of operating conditions, the complexity of industrial geometries and their r

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Ku, Garam, Songjune Lee, Cheolung Cheong, Woong Kang, and Kuksu Kim. "Development of High-Fidelity Numerical Methodology Based on Wavenumber-Frequency Transform for Quantifying Internal Aerodynamic Noise in Critical Nozzle." Applied Sciences 9, no. 14 (2019): 2885. http://dx.doi.org/10.3390/app9142885.

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In industrial fields dealing with high-temperature and high-pressure gas such as chemical, petrochemical, and offshore oil production plants, piping systems with valves are frequently used to protect the relevant system and equipment from being damaged by such gases. However, excessive noise is sometimes generated by the valve flow in the piping system, causing so-called acoustic induced vibration in the pipe wall. Therefore, it is of great importance to design the related system to avoid this phenomenon. In this study, a high-fidelity numerical procedure is proposed to assess the acoustic pow

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Page, G. J., and J. J. McGuirk. "Large Eddy Simulation of a complete Harrier aircraft in ground effect." Aeronautical Journal 113, no. 1140 (2009): 99–106. http://dx.doi.org/10.1017/s0001924000002827.

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Abstract This paper aims to demonstrate the viability of using the large eddy simulation (LES) CFD methodology to model a representative, complete STOVL aircraft geometry at touch down. The flowfield beneath such a jet-borne vertical landing aircraft is inherently unsteady. Hence, it is argued in the present work that the LES technique is the most suitable tool to predict both the mean flow and unsteady fluctuations, and, with further development and validation testing, this approach could be a replacement, and certainly a complementary aid, to expensive rig programmes. The numerical method us

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Bi, Xiaosheng, Jiayuan Zhuang, and Yumin Su. "Seakeeping Analysis of Planing Craft under Large Wave Height." Water 12, no. 4 (2020): 1020. http://dx.doi.org/10.3390/w12041020.

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The purpose of this paper is to conduct a seakeeping analysis of planing craft under regular wave with large wave height. To obtain a reliable numerical method to simulate the sailing of planing craft in waves, Reynolds-averaged Navier–Stokes (RANS) solver and overset method are adopted. The motion response and resistance of the planing craft USV01 in regular wave were numerical predicted and compared with the corresponding seakeeping experimental tests. The results show that the numerical method has high accuracy. For further study, a new planing craft whose name is improved vessel is selecte

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16

Ricci, Martina, Stefano Gino Mosele, Marcello Benvenuto, Pio Astrua, Roberto Pacciani, and Michele Marconcini. "Retrofittable Solutions Capability for Gas Turbine Compressors." International Journal of Turbomachinery, Propulsion and Power 7, no. 1 (2022): 3. http://dx.doi.org/10.3390/ijtpp7010003.

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The increasing introduction of renewable energy capacity has changed the perspective on the operation of conventional power plants, introducing the necessity of reaching extreme off-design conditions. There is a strong interest in the development and optimization of technologies that can be retrofitted to an existing power plant to enhance flexibility as well as increase performance and lower emissions. Under the framework of the European project TURBO-REFLEX, a typical F-class gas turbine compressor designed and manufactured by Ansaldo Energia has been studied. Numerical analyses were perform

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PANG, Chao, Meng LI, and Zhenghong GAO. "Study on the effect of transition process on rotor hovering simulation." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 40, no. 2 (2022): 253–60. http://dx.doi.org/10.1051/jnwpu/20224020253.

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Hovering is one of important statuses to evaluate the aerodynamic performance of a rotor. With the development of the computer technology and CFD technique, the numerical methods based on the first principle are usually employed to evaluate the hovering performance of the rotor. The transition process will evidently affect the results from the RANS-based numerical simulations in some steady cases for the fixed wing aircrafts, which should be taken into consideration in the design process. But it's not clear whether the transition process would affect the numerical results for the rotor simulat

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Nakate, Prajakta, Domenico Lahaye, Cornelis Vuik, and Marco Talice. "Analysis of the Aerodynamics in the Heating Section of an Anode Baking Furnace Using Non-Linear Finite Element Simulations." Fluids 6, no. 1 (2021): 46. http://dx.doi.org/10.3390/fluids6010046.

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The emissions from the industrial furnaces impact the environment. Among the various factories, those having anode baking furnaces are working on reducing the pollutant emissions. The aerodynamics in the furnace influences the emissions due to the high dependence of combustion and radiation phenomena on the mixing characteristics. Therefore, this paper aims to establish the numerical simulation results for the three-dimensional turbulent flow in a single section of an anode baking furnace with a high rate of fuel injection. The stabilized non-linear finite element approach on the Reynolds-aver

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19

Sugianto, Erik, Jeng-Horng Chen, and Niki Veranda Agil Permadi. "Effect of Monohull Type and Catamaran Hull Type on Ocean Waste Collection Behavior Using OpenFOAM." Water 14, no. 17 (2022): 2623. http://dx.doi.org/10.3390/w14172623.

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Ocean waste that continues moving in the water has been a problem until now. This has stimulated marine debris cleaning technology to emerge. This research sought to evaluate the effectiveness of waste collection using a monohull and catamaran fitted with a forward conveyor. The Reynolds Average Navier Stokes (RANS)-based numerical simulation research is used to predict flow pattern characteristics, velocity contour, wave pattern, pressure distribution, and ship resistance. The current research focuses on the impact of a round-bilge-type monohull and inner flat-type catamaran hull front shape

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Laroche, Emmanuel, David Donjat, and Philippe Reulet. "A Combined Experimental and Numerical Characterization of the Flowfield and Heat Transfer around a Multiperforated Plate with Compound Angle Injection." Energies 14, no. 3 (2021): 613. http://dx.doi.org/10.3390/en14030613.

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The aerodynamic and thermal behaviour of multiperforated zones in combustors is essential to the development of future combustion chambers. Detailed databases are therefore crucial for the validation of RANS/LES solvers, but also regarding the derivation of heat transfer correlations used in 0D/1D in-house codes developed by engine manufacturers. In the framework of FP7 EU SOPRANO Program, the test-rig used in a previous study is modified to be compatible with anisothermal conditions. The plate studied is a 12:1 model with a 90∘ compound angle injection. A heating system is used to generate a

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21

Salari, Mohammad Sadegh, Behzad Zarif Boushehri, and Mehrdad Boroushaki. "Aerodynamic analysis of backward swept in HAWT rotor blades using CFD." International Journal of Renewable Energy Development 7, no. 3 (2018): 241–49. http://dx.doi.org/10.14710/ijred.7.3.241-249.

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The aerodynamical design of backward swept for a horizontal axis wind turbine blade has been carried out to produce more power at higher wind velocities. The backward sweep is added by tilting the blade toward the air flow direction. Computational Fluid Dynamics (CFD) calculations were used for solving the conservation equations in one outer stationary reference frame and one inner rotating reference frame, where the blades and grids were fixed in reference to the rotating frame. The blade structure was validated using Reynolds Averaged Navier-Stokes (RANS) solver in a test case by the Nationa

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Kang, Wenzhe, Lingjiu Zhou, Dianhai Liu, and Zhengwei Wang. "Backflow effects on mass flow gain factor in a centrifugal pump." Science Progress 104, no. 2 (2021): 003685042199886. http://dx.doi.org/10.1177/0036850421998865.

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Previous researches has shown that inlet backflow may occur in a centrifugal pump when running at low-flow-rate conditions and have nonnegligible effects on cavitation behaviors (e.g. mass flow gain factor) and cavitation stability (e.g. cavitation surge). To analyze the influences of backflow in impeller inlet, comparative studies of cavitating flows are carried out for two typical centrifugal pumps. A series of computational fluid dynamics (CFD) simulations were carried out for the cavitating flows in two pumps, based on the RANS (Reynolds-Averaged Naiver-Stokes) solver with the turbulence m

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Liang, Long, Song-Charng Kong, Chulhwa Jung, and Rolf D. Reitz. "Development of a Semi-implicit Solver for Detailed Chemistry in Internal Combustion Engine Simulations." Journal of Engineering for Gas Turbines and Power 129, no. 1 (2006): 271–78. http://dx.doi.org/10.1115/1.2204979.

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An efficient semi-implicit numerical method is developed for solving the detailed chemical kinetic source terms in internal combustion (IC) engine simulations. The detailed chemistry system forms a group of coupled stiff ordinary differential equations (ODEs), which presents a very stringent time-step limitation when solved by standard explicit methods, and is computationally expensive when solved by iterative implicit methods. The present numerical solver uses a stiffly stable noniterative semi-implicit method. The formulation of numerical integration exploits the physical requirement that th

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Mramor, Katarina, Robert Vertnik, and Božidar Šarler. "Development of Three-Dimensional LES Based Meshless Model of Continuous Casting of Steel." Metals 12, no. 10 (2022): 1750. http://dx.doi.org/10.3390/met12101750.

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A large-eddy simulation (LES) based meshless model is developed for the three-dimensional (3D) problem of continuous casting (CC) of steel billet. The local collocation meshless method based on radial basis functions (RBF) is applied in 3D. The method applies scaled multiquadric (MQ) RBF with a shape parameter on seven nodded local sub-domains. The incompressible turbulent fluid flow is described using mass, energy, and momentum conservation equations and the LES turbulence model. The solidification system is solved with the mixture continuum model. The Boussinesq approximation for buoyancy an

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Ryu, Seo Yoon, Cheolung Cheong, Jong Wook Kim, and Byung il Park. "Development of virtual fan flow and acoustic performance testers based on RANS solvers and acoustic analogy." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (2021): 4336–42. http://dx.doi.org/10.3397/in-2021-2667.

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As the potential of computational resources dramatically increases, the so-called computer-aided engineering readily replaces experiment-based engineering in related industrial fields. In this study, the virtual fan flow and acoustic performance testers are developed using the RANS solvers and the acoustic analogy. Two types of forward-curved centrifugal fans are selected for numerical and experimental investigations into its flow and acoustic performances. First, to experimentally evaluate the performances of the centrifugal fan units, their P-Q curves and sound power levels are measured usin

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Rakai, Aniko, and Jörg Franke. "Validation of two RANS solvers with flow data of the flat roof Michelstadt case." Urban Climate 10 (December 2014): 758–68. http://dx.doi.org/10.1016/j.uclim.2013.11.003.

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Pellone, C., T. Maître, and J. P. Franc. "RANS Simulations of Supercavity Flows." Journal of Ship Research 54, no. 03 (2010): 161–73. http://dx.doi.org/10.5957/jsr.2010.54.3.161.

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This work aims at evaluating the capacity and limitations of conventional Reynolds-averaged Navier-Stokes (RANS) techniques to numerically simulate supercavity flows. The configuration is that of a two-dimensional (2D) symmetrical supercavitating wedge investigated experimentally by Michel (1974). Mesh effect is studied in detail under noncavitating conditions. The computational grid is refined in the region where cavitation develops in order to accurately track the supercavity. The effect of tunnel height is also analyzed, and the height finally chosen was large enough to simulate an infinite

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R., Feshchur, and Sosnova N. "EVALUATION OF THE GENERAL ATTRACTIVENESS OF THE URBAN PUBLIC SPACE ACCORDING TO MANY CRITERIA." Vìsnik Nacìonalʹnogo unìversitetu "Lʹvìvsʹka polìtehnìka". Serìâ Arhìtektura 2, no. 2 (2020): 193–203. http://dx.doi.org/10.23939/sa2020.02.193.

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Cities are constantly changing – new and existing facilities are created and reconstructed, existing ones are modernized, and new territories are developed, and, accordingly, public spaces are formed and develop in a certain way. To a large extent, this process is random and does not take place systematically, but this rather happens as a response to the urgent economic, environmental, social or other needs of city residents. Development management in the urban planning system is designed to solve the controversial problem of maintaining integrity and at the same time striving for its transfor

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Otake, Yoshie. "RIKEN Accelerator-driven compact neutron systems." EPJ Web of Conferences 231 (2020): 01009. http://dx.doi.org/10.1051/epjconf/202023101009.

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RIKEN Accelerator-driven compact neutron source, RANS, has been operational since 2013. There are two major goals of RANS research and development. One is to establish a new compact low energy neutron non-destructive evaluation system on-site of floor-standing type for industrial use. Another goal is to invent a novel transportable compact neutron system for the preventive maintenance of large scale construction such as a bridge. The low energy transmission imaging, neutron diffractometer, small angle scattering instruments, fast neutron transmission imaging, fast neutron back scattering imagi

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Lohrmann, David K., and Stuart W. Fors. "Can School-Based Educational Programs Really Be Expected to Solve the Adolescent Drug Abuse Problem?" Journal of Drug Education 16, no. 4 (1986): 327–39. http://dx.doi.org/10.2190/2mue-3d1d-agnf-fxha.

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The recommendation of a 1984 Rand Corporation report that the most effective way to prevent adolescent drug abuse is through preventive education is reviewed within the context of theories related to the causes of drug abuse integrated with the PRECEDE model of health education program planning. It is concluded that many of the variables which influence adolescents to begin use of psychoactive substances are not within the purview of schools. Therefore, the Rand recommendation should only be accepted if three conditions are met: 1) there should be a consistent governmental policy toward drug e

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T, Pradeep, and Umadevi P. "Assessment of factors Influencing Communication among bottom line and top management in Construction Industry." YMER Digital 21, no. 02 (2022): 238–47. http://dx.doi.org/10.37896/ymer21.02/24.

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In day-to-day life the construction industry has become active with more desgins and construction project. Their emerging field existence involves management and execution by highly qualified and task coordinated project team from various organization. Throughout the project, required information must be identified and discussed amount of information flows among the entire workers in the construction industry. Few factors has been identified through the research. The identified factors are inaccuracy, misunderstanding, barriers, project complexity, timeliness, project communication media, arra

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Mitikhin, V., T. Solokhina, G. Tiumenkova, and M. Kuzminova. "Using the analytic hierarchy process to assess the severity of psychopathological states." European Psychiatry 65, S1 (2022): S755. http://dx.doi.org/10.1192/j.eurpsy.2022.1951.

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Introduction Currently, there are known problems of assessing the severity of psychopathological states based on psychometric (rank) scales [1]. The main problem: ranks are non-numeric information that does not allow the simplest mathematical operations (summation, average) [2] and, as a result, the impossibility of constructing correct models for evaluating states Objectives Development of algorithms for processing initial rank information about the severity of psychopathological states in order to obtain results in numerical form based on the Analytic Hierarchy Process (AHP) [2] Methods Clin

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Nakonieczny, Damian S., Magdalena Antonowicz, and Zbigniew Paszenda. "Surface modification methods of ceramic filler in ceramic-carbon fibre composites for bioengineering applications – A systematic review." REVIEWS ON ADVANCED MATERIALS SCIENCE 59, no. 1 (2020): 586–605. http://dx.doi.org/10.1515/rams-2020-0024.

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AbstractThe present review paper focuses on the current state of the art of the alumina-silicate ceramics and surface modifications of ceramics dedicated as fillers in composites with carbon fiber. The use of aluminum-silicates in the form of a cenosphere due to their outstanding properties, i.e., low density, high hardness, and total chemical inertness seem to be promising in biomaterial engineering applications. First of all, the possibilities of the composites application in orthopedic and prosthetic implantology. The following section discusses problems with the use of aluminum silicate ce

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Afailal, Al Hassan, Jérémy Galpin, Anthony Velghe, and Rémi Manceau. "Development and validation of a hybrid temporal LES model in the perspective of applications to internal combustion engines." Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 74 (2019): 56. http://dx.doi.org/10.2516/ogst/2019031.

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CFD simulation tools are increasingly used nowadays to design more fuel-efficient and clean Internal Combustion Engines (ICE). Within this framework, there is a need to benefit from a turbulence model which offers the best compromise between prediction capabilities and computational cost. The Hybrid Temporal LES (HTLES) approach is here retained within the perspective of an application to ICE configurations. HTLES is a hybrid Reynolds-Averaged Navier Stokes/Large Eddy Simulation (RANS/LES) model based on a solid theoretical framework using temporal filtering. The concept is to model the near-w

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Hong, Phuc Nguyen, and Chang Wook Ahn. "Stereo Matching Methods for Imperfectly Rectified Stereo Images." Symmetry 11, no. 4 (2019): 570. http://dx.doi.org/10.3390/sym11040570.

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Stereo matching has been under development for decades and is an important process for many applications. Difficulties in stereo matching include textureless regions, occlusion, illumination variation, the fattening effect, and discontinuity. These challenges are effectively solved in recently developed stereo matching algorithms. A new imperfect rectification problem has recently been encountered in stereo matching, and the problem results from the high resolution of stereo images. State-of-the-art stereo matching algorithms fail to exactly reconstruct the depth information using stereo image

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Yang, Anbang, Jiangbo Qian, Huahui Chen, and Yihong Dong. "A Ranking-Based Hashing Algorithm Based on the Distributed Spark Platform." Information 11, no. 3 (2020): 148. http://dx.doi.org/10.3390/info11030148.

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With the rapid development of modern society, generated data has increased exponentially. Finding required data from this huge data pool is an urgent problem that needs to be solved. Hashing technology is widely used in similarity searches of large-scale data. Among them, the ranking-based hashing algorithm has been widely studied due to its accuracy and speed regarding the search results. At present, most ranking-based hashing algorithms construct loss functions by comparing the rank consistency of data in Euclidean and Hamming spaces. However, most of them have high time complexity and long

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Alexandrov, Islam A., Andrey V. Kirichek, Vladimir Z. Kuklin, and Leonid M. Chervyakov. "Development of an Algorithm for Multicriteria Optimization of Deep Learning Neural Networks." HighTech and Innovation Journal 4, no. 1 (2023): 157–73. http://dx.doi.org/10.28991/hij-2023-04-01-011.

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Nowadays, machine learning methods are actively used to process big data. A promising direction is neural networks, in which structure optimization occurs on the principles of self-configuration. Genetic algorithms are applied to solve this nontrivial problem. Most multicriteria evolutionary algorithms use a procedure known as non-dominant sorting to rank decisions. However, the efficiency of procedures for adding points and updating rank values in non-dominated sorting (incremental non-dominated sorting) remains low. In this regard, this research improves the performance of these algorithms,

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Liu, Guangjun, Xiaoping Xu, Feng Wang, and Yangli Tang. "Solving Traveling Salesman Problems Based on Artificial Cooperative Search Algorithm." Computational Intelligence and Neuroscience 2022 (April 12, 2022): 1–8. http://dx.doi.org/10.1155/2022/1008617.

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The traveling salesman problem is a typical NP hard problem and a typical combinatorial optimization problem. Therefore, an improved artificial cooperative search algorithm is proposed to solve the traveling salesman problem. For the basic artificial collaborative search algorithm, firstly, the sigmoid function is used to construct the scale factor to enhance the global search ability of the algorithm; secondly, in the mutation stage, the DE/rand/1 mutation strategy of differential evolution algorithm is added to carry out secondary mutation to the current population, so as to improve the calc

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Li, Yu, Xiaoxiao Lin, and Jingsen Liu. "An Improved Gray Wolf Optimization Algorithm to Solve Engineering Problems." Sustainability 13, no. 6 (2021): 3208. http://dx.doi.org/10.3390/su13063208.

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With the rapid development of the economy, the disparity between supply and demand of resources is becoming increasingly prominent in engineering design. In this paper, an improved gray wolf optimization algorithm is proposed (IGWO) to optimize engineering design problems. First, a tent map is used to generate the initial location of the gray wolf population, which evenly distributes the gray wolf population and lays the foundation for a diversified global search process. Second, Gaussian mutation perturbation is used to perform various operations on the current optimal solution to avoid the a

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Jungo, Aidan, Mengmeng Zhang, Jan B. Vos, and Arthur Rizzi. "Benchmarking New CEASIOM with CPACS adoption for aerodynamic analysis and flight simulation." Aircraft Engineering and Aerospace Technology 90, no. 4 (2018): 613–26. http://dx.doi.org/10.1108/aeat-11-2016-0204.

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Purpose The purpose of this paper is to present the status of the on-going development of the new computerized environment for aircraft synthesis and integrated optimization methods (CEASIOM) and to compare results of different aerodynamic tools. The concurrent design of aircraft is an extremely interdisciplinary activity incorporating simultaneous consideration of complex, tightly coupled systems, functions and requirements. The design task is to achieve an optimal integration of all components into an efficient, robust and reliable aircraft with high performance that can be manufactured with

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Kovalchuk, Olha, and Nataliia Strelbitska. "MODEL ANALYSIS OF INDICATORS OF SUSTAINABLE DEVELOPMENT OF WORLD COUNTRIES." Economic Analysis, no. 28(1) (2018): 71–78. http://dx.doi.org/10.35774/econa2018.01.071.

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The article discusses the possibilities of use of classical instruments of analytical methods and data mining methods for global sustainability modelling. To divide countries into groups according to the indicators that are traditionally allocated for sustainability studying, it is carried out the cluster analysis by k-medium method, which resulted in 2 clusters. The first cluster includes economically developed industrialized countries. A high level of social performance and a low level of inequality of outcomes characterize them. At the same time, these countries have high rank of corruption

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Weatheritt, Jack, and Richard David Sandberg. "Improved Junction Body Flow Modeling Through Data-Driven Symbolic Regression." Journal of Ship Research 63, no. 4 (2019): 283–93. http://dx.doi.org/10.5957/josr.09180053.

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A novel data-driven turbulence modeling framework is presented and applied to the problem of junction body flow. In particular, a symbolic regression approach is used to find nonlinear analytical expressions of the turbulent stress‐strain coupling that are ready for implementation in computational fluid dynamics (CFD) solvers using Reynolds-averaged Navier‐Stokes (RANS) closures. Results from baseline linear RANS closure calculations of a finite square-mounted cylinder with a Reynolds number of <inline-graphic xlink:href="josr09180053inf1.tif"/>, based on diameter and freestream velocity

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Kinnas, Spyros A., Hongyang Fan, and Ye Tian. "A Panel Method with a Full Wake Alignment Model for the Prediction of the Performance of Ducted Propellers." Journal of Ship Research 59, no. 03 (2015): 246–57. http://dx.doi.org/10.5957/jsr.2015.59.3.246.

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An improved perturbation potential-based panel method is applied to model the flow around ducted propellers. One significant development in this method is the application of full wake alignment scheme in which the trailing vortex wake sheets of the blades are aligned with the local flow velocity by also considering the effects of duct and duct wake. A process of repaneling the duct is simultaneously introduced to improve the accuracy of the method. The results from the improved wake model are compared with those from a simplified wake alignment scheme. At the same time, full-blown Reynolds-ave

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Xiao, Tuo, Taiping Cui, S. M. Riazul Islam, and Qianbin Chen. "Joint Content Placement and Storage Allocation Based on Federated Learning in F-RANs." Sensors 21, no. 1 (2020): 215. http://dx.doi.org/10.3390/s21010215.

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With the rapid development of mobile communication and the sharp increase of smart mobile devices, wireless data traffic has experienced explosive growth in recent years, thus injecting tremendous traffic into the network. Fog Radio Access Network (F-RAN) is a promising wireless network architecture to accommodate the fast growing data traffic and improve the performance of network service. By deploying content caching in F-RAN, fast and repeatable data access can be achieved, which reduces network traffic and transmission latency. Due to the capacity limit of caches, it is essential to predic

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Zweig, David. "Prosperity and Conflict in Post-Mao Rural China." China Quarterly 105 (March 1986): 1–18. http://dx.doi.org/10.1017/s0305741000036742.

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In 1980 the People's Daily reported that 200 million Chinese peasants were living below the poverty line, while in 1982 Vicepremier Wan Li admitted the “for many years in the past, more than 150 million peasants had not solved the problem of not having enough to eat.” To enrich the rural economy, Party leaders called on peasants to pursue numerous private roads to prosperity. The new policy, highlighted by the phrase “permit some peasants to get rich first” (rang yixie nongmin xian fuqilai), allows households who are more industrious, more innovative and, of course, those with better personal

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Zhao, Wei, Sheng Chen, Junyi Yang, and Weichang Zhou. "Assessment of RANS Turbulence Models in Prediction of the Hydrothermal Plume in the Longqi Hydrothermal Field." Applied Sciences 13, no. 13 (2023): 7496. http://dx.doi.org/10.3390/app13137496.

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In this paper, the numerical models are selected to simulate the hydrothermal plume based on the water temperature observation data of the Longqi hydrothermal field in the Southwest Indian Ridge (SWIR). Then, the unsteady Reynolds-averaged Navier–Stokes equations are solved to evaluate the performance of the Realizable k-ε (rke) model and the SST k-ω (sst) model in hydrothermal plume simulation. By comparing the calculated results with the Conductivity Temperature Depth (CTD) observation data and the literature results, the difference in prediction performance between the two models is evaluat

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Padmanabhan, K. A., and M. Raviathul Basariya. "On the Common Origin of Structural Superplasticity in Different Classes of Materials." REVIEWS ON ADVANCED MATERIALS SCIENCE 54, no. 1 (2018): 1–13. http://dx.doi.org/10.1515/rams-2018-0016.

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Abstract The present model starts with an assumption that grain/ interphase boundary sliding (GBS) that is dominant during optimal superplastic flow is slower than the accommodation processes of dislocation emission from sliding boundaries, highly localized diffusion in the boundary regions and/ or grain rotation that are present as a concomitant of the GBS process. When boundary sliding develops to a mesoscopic scale (of the order of a grain diameter or more), by the alignment of contiguous boundaries, plane interface formation/ mesoscopic boundary sliding is observed. Significant and simulta

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Liu, Zhao, Jianwei Ma, and Xueshan Yong. "Line survey joint denoising via low-rank minimization." GEOPHYSICS 84, no. 1 (2019): V21—V32. http://dx.doi.org/10.1190/geo2018-0141.1.

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Prestack seismic data denoising is an important step in seismic processing due to the development of prestack time migration. Reduced-rank filtering is a state-of-the-art method for prestack seismic denoising that uses predictability between neighbor traces for each single frequency. Different from the original way of embedding low-rank matrix based on the Hankel or Toeplitz transform, we have developed a new multishot gathers joint denoising method in a line survey, which used a new way of rearranging data to a matrix with low rank. Inspired by video denoising, each single-shot record in the

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I. Bon, Lizaveta. "Using L-Arginine-No Pathway Modulators in Rats with Subtotal Cerebral Ischemia. Histological Changes." Clinical Trials and Bioavailability Research 2, no. 1 (2023): 01–04. http://dx.doi.org/10.58489/2836-5836/007.

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Acute cerebrovascular accident is one of the most urgent problems in modern medicine. The frequency of strokes varies in different regions of the world from 1 to 4 cases per 1000 population per year, increasing significantly with age. Cerebrovascular diseases of ischemic origin tend to grow, rejuvenate, are associated with a severe clinical course, high rates of disability and mortality [1-6]. The relevance of the problem of cerebrovascular diseases can rightfully be defined as extraordinary, requiring the concentration of efforts of specialists of different profiles to solve it. Subtotal cere

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Wang, Lin, Mengfan Shao, Yeqian Jiang, and Qianqian Chen. "Research on Zhejiang Province's Textile and Apparel Export Based on SWOT Analysis." Advances in Economics and Management Research 1, no. 2 (2022): 11. http://dx.doi.org/10.56028/aemr.1.2.11.

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The textile and garment industry, as a vigorously developed industry in Zhejiang Province, ranks first in China's exports.In line with the development of the times, how to develop and developing the textile and garment export market at home and abroad is an urgent problem to be solved in the economic development of Zhejiang Province. It is related to the future development direction of my country's textile and garment industry.This paper uses the SWOT analysis method to analyze the export of the textile and apparel industry in Zhejiang Province and puts forward the countermeasures for improvin

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