Journal of Engineering Mathematics最新文献_第5页

Implicit interpolation method for immersed boundary methods 沉浸边界法的隐含插值法

IF 1.3 4区工程技术

Journal of Engineering Mathematics Pub Date : 2024-04-17 DOI: 10.1007/s10665-024-10357-z

Md. Sujaat Ali, Renan de Holanda Sousa, M. Ossman Awad, Ricardo Camarero, Jean-Yves Trépanier

引用次数: 0

A novel asymptotically consistent approximation for integral evaporation from a spherical cap droplet 球帽液滴积分蒸发的渐近一致近似新方法

IF 1.3 4区工程技术

Journal of Engineering Mathematics Pub Date : 2024-04-17 DOI: 10.1007/s10665-024-10355-1

Alexander W. Wray, Madeleine R. Moore

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A droplet in a ferrofluid droplet under a rotating magnetic field 旋转磁场下铁流体液滴中的液滴

IF 1.3 4区工程技术

Journal of Engineering Mathematics Pub Date : 2024-04-17 DOI: 10.1007/s10665-024-10343-5

Xinping Zhou, Wencai Xiao, Qi Zhang, Wanqiu Zhang, Fei Zhang

{"title":"A droplet in a ferrofluid droplet under a rotating magnetic field","authors":"Xinping Zhou, Wencai Xiao, Qi Zhang, Wanqiu Zhang, Fei Zhang","doi":"10.1007/s10665-024-10343-5","DOIUrl":"https://doi.org/10.1007/s10665-024-10343-5","url":null,"abstract":"<p>Two-dimensional (2-D) direct numerical simulations of a compound droplet (a non-magnetizable droplet wrapped in a ferrofluid droplet) suspended in a non-magnetizable ambient fluid under a rotating uniform magnetic field are carried out. The motion and deformation of the compound droplet are studied. The numerical results show that there are two stable states (the concentric and the eccentric states) for the compound droplet at the stable stage, dependent on the frequency of the rotating magnetic field and the magnetic Bond number. The feature of the concentric state for the compound droplet at the stable stage is studied in detail. We find that the inner and outer parts of the compound droplet rotate with the magnetic field, while there is hysteresis between the inner (or outer) droplet and the external magnetic field. The hysteresis effect for the inner droplet is weaker than that of the outer droplet, mainly due to the viscous sweeping effect of the outer droplet on the inner droplet. Increasing the frequency of the external magnetic field, both the phase angle between the inner and outer droplets and the time required for the compound droplet to shift from the stable eccentric state to the stable concentric one will increase. For the eccentric state at the stable stage, the eccentricity decreases with the frequency of the rotating magnetic field increasing, but has a peak with the magnetic Bond number increasing. It is hoped that this paper would lay a solid foundation for some potential applications in magnetic biodevices.</p>","PeriodicalId":50204,"journal":{"name":"Journal of Engineering Mathematics","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140616533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the energy decay of a nonlinear time-fractional Euler–Bernoulli beam problem including time-delay: theoretical treatment and numerical solution techniques 论包含时间延迟的非线性时间分数欧拉-伯努利梁问题的能量衰减：理论处理和数值求解技术

IF 1.3 4区工程技术

Journal of Engineering Mathematics Pub Date : 2024-04-12 DOI: 10.1007/s10665-024-10353-3

Toufik Bentrcia, Abdelaziz Mennouni

引用次数: 0

A review on advances in persistent scatterer interferometry and proposing a novel method for phase optimization of distributed scatterers pixels 综述持久散射体干涉测量法的进展，并提出分布式散射体像素相位优化的新方法

IF 1.3 4区工程技术

Journal of Engineering Mathematics Pub Date : 2024-04-10 DOI: 10.1007/s10665-024-10354-2

Mohammad Soyeb Alam, Dheeraj Kumar, Gajendra K. Vishwakarma

{"title":"A review on advances in persistent scatterer interferometry and proposing a novel method for phase optimization of distributed scatterers pixels","authors":"Mohammad Soyeb Alam, Dheeraj Kumar, Gajendra K. Vishwakarma","doi":"10.1007/s10665-024-10354-2","DOIUrl":"https://doi.org/10.1007/s10665-024-10354-2","url":null,"abstract":"<p>Spaceborne SAR Interferometry techniques namely Differential SAR Interferometry (DInSAR) and Persistent Scatterer Interferometry (PSI) are remote sensing-based techniques used to measure and monitor terrain deformations. In the present study, advances in PSI since its inception, considering three important parameters (pixel selection criteria, baseline configuration, and deformation model) is discussed in detail. Further, in view of the research heading towards the pixel selection criteria and phase optimization of Distributed Scatterers (DSs) pixels, detailed discussion is made over its advancement also. In addition, the statistical homogenous pixel (SHP) and the similar time-series interferometric phase (STIP) pixel-based PSCs selection are the latest development. In view of this, the connection and difference of major and latest SHP and STIP pixel-based PSCs selection methods in term of the mathematic model of phase optimization for conventional DS and DS with multiple scattering mechanism (DS-MSM), types of pixel selection capability, computational efficiency are characterized. Further, in this study, a novel Bayesian methodology and its details are proposed for the phase optimization of DS pixels, which will provide a much better idea of the characteristics of the parameter of interest than latest one based on complex least square mathematic model for phase optimization of DS pixels.</p>","PeriodicalId":50204,"journal":{"name":"Journal of Engineering Mathematics","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140561872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solution of linear and nonlinear singular value problems using operational matrix of integration of Fibonacci wavelets 利用费波纳奇小波积分运算矩阵求解线性和非线性奇异值问题

IF 1.3 4区工程技术

Journal of Engineering Mathematics Pub Date : 2024-04-05 DOI: 10.1007/s10665-024-10350-6

Vivek, Manoj Kumar

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Adequate viscosity-induced porous boundary layer flow and heat transfer over a permeable wedge 透水楔上充分的粘性多孔边界层流动和传热

IF 1.3 4区工程技术

Journal of Engineering Mathematics Pub Date : 2024-04-03 DOI: 10.1007/s10665-024-10348-0

{"title":"Adequate viscosity-induced porous boundary layer flow and heat transfer over a permeable wedge","authors":"","doi":"10.1007/s10665-024-10348-0","DOIUrl":"https://doi.org/10.1007/s10665-024-10348-0","url":null,"abstract":"<h3>Abstract</h3> <p>The present study examines the impact of effective viscosity and suction/injection on the two-dimensional boundary layer flow and heat transfer across a wedge immersed in a porous medium. In this study, we analyze the mechanisms associated with porous media and the fluid, focusing specifically on the viscosity ratio(effective viscosity to the dynamic viscosity) effects. The movement or progression of the fluid outside the boundary layer is acquired in the form of a concept of fluid distance. The governing nonlinear ordinary differential equations are derived from the boundary layer equations with suitable similarity transformations. Two approaches are utilized in this study: comprehensive numerical simulations that solve the nonlinear fully coupled fluid-wedge interaction issue and asymptotic approaches that solve the linearized equation-acquired at a significant distance away from the wedge and a small Prandtl number. A high level of concordance exists between the two methodologies in their predictive capabilities. The velocity and temperature distributions for different favorable pressure gradient and suction parameters are to reduce both momentum and thermal boundary layer thickness, while an opposite scenario is noticed for injection parameters. These results are shown to be a continuation of classical Falkner-Skan flows. The viscosity ratio plays a role in reducing the thickness of the boundary layer, leading to the fluid exhibiting adhesion to the surface of the wedge. Moreover, the effect of permeability-the presence of a porous medium, reduces the thickness of the boundary layer. A comprehensive examination of the outcomes and their associated hydrodynamics concerning the physical parameters is conducted and made in some detail.</p>","PeriodicalId":50204,"journal":{"name":"Journal of Engineering Mathematics","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140561975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation of basal crevasses of the tidewater glacier with Galerkin least-squares finite element method 用 Galerkin 最小二乘有限元法对潮水冰川的基底裂缝进行数值模拟

IF 1.3 4区工程技术

Journal of Engineering Mathematics Pub Date : 2024-04-03 DOI: 10.1007/s10665-024-10356-0

Hsueh-Chen Lee, Min-Hung Chen, Jay Chu, Ming-Cheng Shiue

{"title":"Numerical simulation of basal crevasses of the tidewater glacier with Galerkin least-squares finite element method","authors":"Hsueh-Chen Lee, Min-Hung Chen, Jay Chu, Ming-Cheng Shiue","doi":"10.1007/s10665-024-10356-0","DOIUrl":"https://doi.org/10.1007/s10665-024-10356-0","url":null,"abstract":"<p>This study employs the two-dimensional nonlinear Stokes ice sheet model and a Galerkin least-squares (GLS) finite element method to investigate iceberg calving at the terminus of tidewater glaciers. We propose an approach based on pressure and normal stress solutions to adjust the grounding line position and present effective principal stress contours and profiles for grounded and notch glaciers with basal crevasses at the grounding line. Our results indicate that the openings of these basal crevasses are significantly affected by water pressure. In addition, stress profiles in ungrounded tidewater glaciers vary from those in fully grounded tidewater glaciers, which could affect iceberg calving. We also conduct numerical experiments to analyze the effects of slip length, notch length, and surface slope and examine the effectiveness of the GLS method in numerical solutions. Our results are in agreement with prior findings in the literature that basal crevasses are significantly affected by water pressure, and stress profiles are significantly different in grounded and ungrounded tidewater glaciers.</p>","PeriodicalId":50204,"journal":{"name":"Journal of Engineering Mathematics","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140561930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An enhanced flux continuity three-dimensional finite element method for heterogeneous and anisotropic diffusion problems on general meshes 通用网格上异质和各向异性扩散问题的增强通量连续性三维有限元方法

IF 1.3 4区工程技术

Journal of Engineering Mathematics Pub Date : 2024-03-30 DOI: 10.1007/s10665-024-10347-1

Ong Thanh Hai, Thi Hoai Thuong Nguyen, Anh Ha Le, Nguyen Van Vuong Do

引用次数: 0

On icicle ripples 冰柱涟漪上

IF 1.3 4区工程技术

Journal of Engineering Mathematics Pub Date : 2024-03-28 DOI: 10.1007/s10665-024-10336-4

{"title":"On icicle ripples","authors":"","doi":"10.1007/s10665-024-10336-4","DOIUrl":"https://doi.org/10.1007/s10665-024-10336-4","url":null,"abstract":"<h3>Abstract</h3> <p>Natural icicles have an overall conical shape modulated by surface ripples. It has been noted from many observations of icicles formed in nature and in the laboratory that the wavelength of the ripples has a very narrow spectrum between about 8 and 12 mm and that, as time evolves, the phase of the ripples migrates upwards. In this pedagogical review, I explore some of the physical mechanisms that can cause and mediate the formation and migration of ripples on icicles using simple mathematical models. To keep the mathematics more straightforward and transparent, I confine attention to two dimensions. A key physical parameter is the surface tension between the film of water that coats an icicle and the air that surrounds it, which causes a phase shift between the film–air interface and the ice–film interface. I show that the wavelength of ripples is dominantly proportional to the cube root of the square of the gravity-capillary length times the thickness of the water film. At high film-flow rates, advection-dominated heat transfer coupled with the interfacial phase shift becomes the dominant driver of instability. Gibbs–Thomson undercooling provides an unexpectedly large stabilisation of small wavelengths at these large flow rates, sufficient to maintain wavelength selection at millimetre scales.</p>","PeriodicalId":50204,"journal":{"name":"Journal of Engineering Mathematics","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140323510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0