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Novel Analytical Thermal Performance Rate Analysis in ZnO-SAE50 Nanolubricant: Nonlinear Mathematical Model

Computers, Materials & Continua 2021年第4期67卷 477-489页

作者： Adnan Abbasi Umar Khan Naveed Ahmed Syed Tauseef Mohyud-Din Ilyas Khan El-Sayed M.Sherif Department of Mathematics Mohi-ud-Din Islamic UniversityNerian SharifAJ&K12080Pakistan Department of Mathematics and Statistics Hazara UniversityMansehra21120Pakistan Department of Mathematics HITEC UniversityTaxilaCantt47070Pakistan University of Multan Multan66000Pakistan Department of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh City72915Vietnam Department of Mechanical Engineering College of EngineeringKing Saud UniversityAl-Riyadh11421Saudi Arabia Department of Physical Chemistry Electrochemistry and Corrosion LaboratoryNational Research CentreCairo12622Egypt

The investigation of local thermal transport rate in the nanolubricants is *** lubricants are broadly used in environmental pollution,mechanical engineering and in the paint industry due to high thermal performance ***,thermal transport in ZnO-SAE50 nanolubricant under the impacts of heat generation/absorption is *** colloidal suspension is flowing between parallel stretching disks in which the lower disk is positioned at z=0 and upper disk apart from distance *** problem is transformed in dimensionless version via described similarity *** the next stage,an analytical technique(VPM)is implemented for the solution *** graphical results against multiple flow parameters were furnished over the region of interest and explained *** is imperative to mention that the results are plotted for ZnO-SAE50 and conventional liquid as ***,rapid motion of the fluid is perceived against high Reynolds andγ*** wall shear stresses at the upper end rises for multiple Reynolds andγwhile;decrement is detected at the lower *** significant contribution of an internal heat source is noted for thermal performance rate at the upper ***,the local heat transport rate declines at the lower *** altering Reynolds number,prompt heat transfer rate is gained at the upper disk and increasing behavior of the local heat transport rate is slow at the lower *** the study,it is concluded that the nanolubricants have high thermal ***,such fluids are reliable to use in above stated areas.

关键词： Zno-SAE50 nanolubricant thermal performance local heat transport numerical algorithm skin friction

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Solving schemes for computational magneto-aerodynamics

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JOURNAL OF SCIENTIFIC COMPUTING 2005年第1期25卷 289-306页

作者： Shang, JS Wright State Univ Dayton OH 45435 USA

The electromagnetic force introduces a new physics dimension for enhancing aerodynamic performance of aerospace vehicles. In order to simulate interdisciplinary phenomena, the Navier-Stokes and Maxwell equations in the time domain must be integrated on a common frame of reference. For a wide range of applications from subsonic unmanned vehicles to hypersonic flight control, the resultant nonlinear partial differential equations offer a formidable challenge for numerical analysis. The experience and physical insight using the approximate Riemann and compact-differencing formulation as well as several temporal discritizations will be shared. The most recent development and advancement in numerical procedures for solving this system of governing equations are delineated.

关键词： numerical algorithm computational magneto-aerodynamics

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Determination of physical and geometrical characteristics of layered inhomogeneous elastic medium

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JOURNAL OF INVERSE AND ILL-POSED PROBLEMS 2011年第8期18卷 895-915页

作者： Bogulskii, I. O. Volchkov, Yu. M. Russian Acad Sci Inst Computat Modelling Siberian Branch Krasnoyarsk 660036 Russia Russian Acad Sci Lavrentiev Inst Hydrodynam Siberian Branch Novosibirsk 630090 Russia Novosibirsk State Univ Novosibirsk 630090 Russia

The article contains an exposition of the basic idea of construction of numerical algorithms based upon the several local approximations by linear polynomials for every sought-for function of dynamic problems of solids. We discuss also some problems of determination of physical and geometrical characteristics of layered inhomogeneous medium.

关键词： numerical algorithm decomposition scheme layered medium inverse problem

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An application of DHW algorithm for the solution of inverse heat conduction problem

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INTERNATIONAL JOURNAL OF THERMOPHYSICS 2006年第4期27卷 1264-1273页

作者： Gembarovic, J. Loeffler, M. TPRL Inc W Lafayette IN 47906 USA

A damped heat wave (DHW) algorithm is applied for the temperature distribution calculation in a solution of a linear inverse heat conduction problem (IHCP). A nonlinear least squares algorithm is used for calculation of the unknown boundary heat flux history in a one-dimensional medium. The solution is based on the assumption that the temperature measurements are available, at least, at one point of the medium over the whole time domain. Sample calculations, for a comparison between exact heat sources and estimated ones, are made to confirm the validity of the proposed method. The close agreement between the exact and estimated values calculated for both exact and noisy data shows the potential of the proposed method for finding a relatively accurate heat source distribution in a one-dimensional homogeneous finite medium. The proposed method of solving inverse heat conduction problems is very simple and easy to implement.

关键词： inverse heat conduction problem numerical algorithm temperature distribution

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Local low-rank approach for parameter extraction of ocean internal wave from SAR image

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IET SIGNAL PROCESSING 2019年第1期13卷 1-6页

作者： Wang, Zelong Zhu, Jubo Natl Univ Def Technol Coll Liberal Arts & Sci Changsha 410073 Hunan Peoples R China

Parameter retrieval of ocean internal waves from synthetic aperture radar (SAR) images is an important issue of oceanography;however, the extraction precision is usually limited by the complex waveforms and the noise. To improve the performance of parameter extraction, traditional methods usually focus on removing the noise on SAR images by exploiting its statistical character, but the structure character of ocean internal waves does not draw enough attentions to improve the image quality for parameter extraction. This study presents a local low-rank approach to extract the parameters robustly by associating the noise removing and parameter extraction together. An optimisation model is first developed by associating the speckle suppression and the exploration of the structural prior of internal wave, where the local low-rank prior is utilised. Also then, a numerical algorithm based on alternating optimisation scheme is designed to solve the proposed model. The proposed approach not only improves the extraction precision, but is also robust to the non-ideal cases such as the deformed waveforms. In experiments, both simulations and real data are used to demonstrate the efficiency and robustness of the proposed method.

关键词： synthetic aperture radar radar imaging remote sensing by radar geophysical image processing oceanographic techniques image denoising ocean waves optimisation numerical analysis local low-rank approach parameter extraction ocean internal wave SAR image synthetic aperture radar image parameter retrieval oceanography image quality noise removing numerical algorithm alternating optimisation scheme speckle suppression

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Application of genetic algorithms to texture analysis

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CRYSTAL RESEARCH AND TECHNOLOGY 1999年第8期34卷 1073-1079页

作者： Salek, P Tarasiuk, J Wierzbanowski, K Akad Gorniczo Hutnicza Wydzial Fiz & Tech Jadrowej PL-30059 Krakow Poland

Application of genetic algorithms to texture analysis is presented in this paper. The genetic algorithm technique was applied to the calculation of the orientation distribution function from a set of pole figures. The results are very satisfying. The same algorithm may be also applied to other problems of texture analysis, e.g., to find an optimal texture for a given application.

关键词： genetic algorithm crystallographic texture orientation distribution function pole figure texture analysis numerical algorithm

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An algorithm for accurate modeling and simulating reactor cores with involute-shaped fuel plates by Monte Carlo

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INTERNATIONAL JOURNAL OF ENERGY RESEARCH 2021年第8期45卷 12449-12463页

作者： Zhang, Shen Gui, Nan Kai, Tan Yang, Xingtuan Tu, Jiyuan Jiang, Shengyao Tsinghua Univ Inst Nucl & New Energy Technol Collaborat Innovat Ctr Adv Nucl Energy Technol Key Lab Adv Reactor Engn & SafetyMinist Educ Beijing 100084 Peoples R China RMIT Univ Sch Engn Melbourne Vic Australia

A real three-dimensional representation of reactor core with involute fuel plates via Monte Carlo method is still lacking at the present, and usually equivalent homogeneous models of water coolants and simplified fuel plate shapes have been used. This work proposed an algorithm to simulate the reactor core composed of involute fuel plates with an explicit accurate description of its involute surfaces. The description of involute surfaces is through its governing equations. The mathematical function methods to depict the involute curves and the schemes to compute the distance between any neutron particle and an involute surface along a ray are presented and demonstrated step-by-step. The algorithm is realized in the Monte Carlo code and validated by the published data of a high flux isotope reactor. This study definitively provides a method to model the involute fuel plates in the Monte Carlo simulation.

关键词： fuel plate involute shape Monte Carlo method numerical algorithm reactor core

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Surface treatment of metal by combined particle beam

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INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE 2024年 205卷

作者： Parfenova, Elena S. Knyazeva, Anna G. Russian Acad Sci Siberian Branch Inst Strength Phys & Mat Sci 2-4 Pr Akad Skii Tomsk 634055 Russia

This work is related to modeling of metal surface modification process by combined particles beam. On the basis of thermodynamics of irreversible processes, including equations of state in differential form, a nonlinear model is formulated. The model takes into account the interaction of thermal, diffusion and mechanical waves and finiteness of relaxation times of thermal and diffusion processes. For the combined particle flow such model is proposed for the first time. The numerical algorithm is based on implicit difference schemes. The study of the interaction of waves of different nature is carried out on the example of a copper target treated with nickel and gold particles. It is shown that deformations take the maximal value at the left boundary, which is directly related to the presence of impurity concentration gradients. Depending on the pulse duration, the difference between the extrema on the elastic wave becomes less significant. With increasing temperature, obviously, the diffusion process accelerates. The propagation velocities of the interacting waves are different. The character of distributions of concentrations of introduced particles directly depends on the value of parameters proportional to relaxation times.

关键词： Diffusion Stress wave Heat/mass flux relaxation time Coupled model numerical algorithm Thermoelastic diffusion theory

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Monte Carlo simulation of the coffee-ring effect on porous papers

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THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS 2023年第5期37卷 627-637页

作者： Hwang, Youngjin Kim, Sangkwon Lee, Chaeyoung Kwak, Soobin Lee, Gyeonggyu Kim, Junseok Korea Univ Dept Math Seoul 02841 South Korea

In this article, we present a mathematical model and numerical simulation of the coffee-ring effect on porous papers. The numerical method is based on Monte Carlo simulation. The proposed model is simple but can capture the main mechanism of coffee stain formation on porous papers. Several numerical experiments are presented to demonstrate the performance of the proposed algorithm. We can obtain the coffee-ring effect on porous papers as the computer simulation results.

关键词： Coffee-ring effect Monte Carlo simulation Computer simulation numerical algorithm

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Deep and near-surface consequences of root removal by asymmetric continental delamination

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TECTONOPHYSICS 2011年第1-2期502卷 257-265页

作者： Valera, J. L. Negredo, A. M. Jimenez-Munt, I. Univ Complutense Madrid Dept Geophys Fac Phys E-28040 Madrid Spain CSIC Inst Ciencias Tierra Jaume Almera E-08028 Barcelona Spain

The occurrence of continental delamination has been proposed for a number of areas characterized by highly variable geodynamic settings. In this study we present results of numerical simulations considering different initial setups, representative for geodynamic scenarios where delamination could potentially develop. To mimic a post-collisional orogenic scenario we have designed an initial state characterized by the presence of an area of orogenic lithosphere, with both crustal and lithospheric roots. In a second setup, we have considered a lithospheric root representative of a remnant slab with a flat overlying crust. We focus on predicted evolution of surface and near-surface observables, namely the crustal structure, surface heat flow and isostatic and dynamic topography evolution. Our results show that a high density orogenic lower crust, likely related to the presence of eclogite, significantly accelerates the sinking of the lithospheric mantle. The pattern of local isostatic elevation is characterized by laterally migrating surface uplift/subsidence. This pattern is shown to be little sensitive to lower crust density variations. In contrast, predicted dynamic topography is more sensitive to these changes, and shows surface subsidence adjacent to the delaminating lithospheric mantle for the model with a high density lower crust, and surface uplift above the slab for a model with a less dense lower crust. The reason for uplift in this second model is that the effect of the positive buoyancy of the thickened crust overwhelms the effect of negative buoyancy of the slowly sinking lithospheric mantle. We infer from our modeling that there is not a specific characteristic pattern of topography changes associated with delamination, but it depends on the interplay between highly variable factors, as slab sinking velocity, asthenospheric upwelling and changes in crustal thickness. (C) 2010 Elsevier B.V. All rights reserved.

关键词： Continental delamination Topography evolution Thermo-mechanical modeling numerical algorithm

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