Article
Computer Science, Interdisciplinary Applications
Fernando Cortes, Mikel Brun, Maria Jesus Elejabarrieta
Summary: This paper presents a finite element formulation for the transient dynamic analysis of free layer damping plates, modeling the viscoelastic behavior using fractional derivatives. The method is validated by comparing the results with a finite element model built with hexahedral elements. The proposed formulation accurately reproduces the time response of plates with surface damping treatments and allows conventional plate mass and stiffness matrices to be used for each layer.
COMPUTERS & STRUCTURES
(2023)
Article
Mathematics, Applied
Zuyang Ye, Qingli Fan, Shibing Huang, Aiping Cheng
Summary: A simple and physically sound model is proposed to investigate transient free surface flow behavior in porous media by conceptualizing the pore space as a network of flow paths characterized by straight line elements. The model derives equivalent hydraulic parameters and continuity equation, and reduces the two-dimensional problem to a one-dimensional one, with a finite-element algorithm developed. The model's accuracy is found to have weak sensitivity to time-step size but is sensitive to spacing size, and it performs better than the residual flow procedure for modeling transient surface flow with a complex drainage system.
APPLIED MATHEMATICS AND COMPUTATION
(2021)
Article
Engineering, Mechanical
Zongbin Hou, Shengyang Peng, Qingmin Yu, Xiaojun Shao
Summary: This study investigated the fracture behavior of interface cracks in the chromium coating steel substrate system under transient convective cooling using the finite element method. The results showed that the increase in crack density and coating thickness reduced the energy release rate, and the shear mode dominated the fracture behavior of the interface cracks.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Environmental Sciences
Jarrett Wise, Sherry Hunt, Mohammed Al Dushaishi
Summary: With many USDA-NRCS-sponsored earthen dams exceeding their service life, seepage has become a common concern due to its potential to cause internal erosion or stability issues. Existing numerical models for estimating seepage are either computationally expensive or assume steady-state conditions. This study proposes the use of a transient thermal finite element analysis (FEA) model as an analogy to predict transient seepage, and its accuracy is verified by comparing it with a transient analytical model. A sensitivity analysis demonstrates that the time aspect of seepage flow is dependent on the medium (soil) rather than the fluid properties.
Article
Computer Science, Interdisciplinary Applications
Alejandro Cornejo, Alessandro Franci, Francisco Zarate, Eugenio Onate
Summary: This paper introduces a novel coupled formulation for fluid-structure interaction problems involving free-surface fluid flows, fracture phenomena, solid mutual contact, and large displacements. The method combines three different Lagrangian computational methods and has high potential for predicting structural damages caused by natural hazards. It can also be applied to fracture phenomena in structures and soils/rocks arising from explosions or hydraulic fracking processes.
COMPUTERS & STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Rehan Waheed, Hasan Aftab Saeed, Sajid Ullah Butt, Bilal Anjum
Summary: This study proposed a framework to mitigate welding-induced distortion by optimizing welding parameters and sequence at the design stage, resulting in a 19% reduction in overall welding-induced distortion.
Article
Mathematics
Walid Aich, Fatih Selimefendigil, Badreddine Ayadi, Lotfi Ben Said, Badr M. Alshammari, Lioua Kolsi, Sid Ali Betrouni, Hatem Gasmi
Summary: A novel porous object is introduced in this study for the control of convective heat transfer in confined slot nanojet impingement under magnetic field effects. Optimization-assisted computational fluid dynamics is used to find the best working conditions to achieve optimal performance. The flow, thermal patterns, and heat transfer characteristics are influenced by the variation in rotational Reynolds number, Hartmann number, permeability of the porous object, and its location.
Article
Energy & Fuels
Yameen Ahmed, Deepak Thrithamarassery Gangadharan, Mohammad Reza Kokaba, Vishal Yeddu, Muhammad Awais, Dongyang Zhang, Vahid Kamraninejad, Makhsud I. Saidaminov
Summary: In this study, perovskite solar cells (PSCs) were fabricated using scalable methods in ambient air, achieving high efficiency and excellent tolerance to oxygen and moisture. The use of a resurfacing strategy improved charge carrier recombination and the devices showed stable performance without encapsulation.
Article
Engineering, Manufacturing
Mojtaba Mozaffar, Shuheng Liao, Jihoon Jeong, Tianju Xue, Jian Cao
Summary: This paper presents a differentiable simulation method for optimizing the thermal behavior of materials in additive manufacturing processes. By using automatic differentiation to compute gradients, high-dimensional design spaces can be handled. The methodology is validated through experimental testing.
ADDITIVE MANUFACTURING
(2023)
Article
Computer Science, Interdisciplinary Applications
Luis F. N. Sa, Carlos M. Okubo, Andre N. Sa, Emilio C. N. Silva
Summary: This work presents a continuous boundary propagation model that can be used as an auxiliary model to propagate boundary conditions in topology optimization problems. The model can handle multiple behaviors of the solid domain resulting from different boundary conditions and is applicable to 3D problems.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Engineering, Multidisciplinary
Jun Liu, Congkuan Hao, Wenbin Ye, Fan Yang, Gao Lin
Summary: Functionally graded material sandwich plates were analyzed for their dynamic behaviors using the SBFEM method with a layerwise approach and continuously graded material properties. The proposed method showed high accuracy and efficiency in dynamic analysis.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Luis F. N. Sa, Carlos M. Jr Jr Okubo, Emilio C. N. Silva
Summary: This work proposes a new topology optimization formulation for subsonic compressible flows, using compressible Navier-Stokes equations coupled with a density-based material model. The algorithm is implemented by a finite element model and evaluated by optimizing 2D domains and a 3D diffuser, resulting in optimized designs with reduced entropy generation.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Thermodynamics
Fatih Selimefendigil, Kaouther Ghachem, Norah Alwadai, Badr M. Alshammari, Lioua Kolsi
Summary: The cooling performance of a multi-slot jet impingement system for a wavy surface is investigated in this study, considering the combined effects of magnetic field, double active rotating cylinders, and nanofluid. The use of double rotating cylinders enhances the cooling process, and the Galerkin weighed residual finite element method is used for the solution of the governing equations. The impacts of rotational Reynolds number (Rew), magnetic field (MG-F) strength (Ha), MG-F inclination, and sub-cooling temperature of the cylinders (dT) on the cooling performance are analyzed.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Mechanics
Atri Nath, Aninda Pal, Prabhakar Akurati, Ritwik Ghoshal, Nilanjan Mitra
Summary: Denticle microstructures in shark skin have been found to significantly influence the natural frequency of free vibration, without altering the mode shapes. The reduction in spacing between denticles further reduces the natural frequency. Understanding these effects of wettability alterations on free vibration response is important for efficient design.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Engineering, Mechanical
He-Wei Du, Jian Qin, Peng Gao
Summary: It has been discovered that classical lubrication theory can be used to describe free-surface flows with small slopes. By modifying the theory to include finite surface slopes and vanishing fluxes, this study examines surface morphologies observed in dip coating of an inclined plate. The results show that the structures, such as films, dimples, and capillary shocks, depend on the inclination angle and relative speed of the plate. Numerical solutions agree well with existing asymptotic theory.
ACTA MECHANICA SINICA
(2022)
Article
Mechanics
Vasileios Charitatos, Wieslaw J. Suszynski, Marcio S. Carvalho, Satish Kumar
JOURNAL OF FLUID MECHANICS
(2020)
Article
Physics, Fluids & Plasmas
Jyun-Ting Wu, Lorraine F. Francis, Marcio S. Carvalho, Satish Kumar
PHYSICAL REVIEW FLUIDS
(2020)
Article
Engineering, Chemical
Jose F. Roca, Ivan F. Menezes, Marcio S. Carvalho
Summary: The study analyzed the flow characteristics of suspended capsules passing through a planar constricted channel and described the flow of inner and continuous liquid phases using the two-dimensional Navier-Stokes equations. The fluid-structure interaction problem was solved using finite element and immersed boundary methods, revealing a reduction in the mobility of the flow.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Energy & Fuels
Kamila Scheffer, Yves Meheust, Marcio S. Carvalho, Marcos H. P. Mauricio, Sidnei Paciornik
Summary: The efficiency of emulsion injection as an enhanced oil recovery method was studied in a synthetic porous medium, where micro-CT images showed that the oil droplets of the emulsion diverted the water path, mobilizing previously trapped oil ganglia.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Applied
Yun-Han Huang, Fleur Salmon, Abhijeet Kamble, April Xu Xu, Mariano Michelon, Bruna C. Leopercio, Marcio S. Carvalho, John M. Frostad
Summary: This research characterized polymer-based microcapsules with a sunflower oil core and a gellan gum shell. Analysis of the force-displacement relationship under uniaxial compression emphasized the importance of determining the precise compressive contact point. Two models were presented to describe the data, with the new model showing the advantage of providing an overall modulus for the capsule as well as the modulus of shell material.
FOOD HYDROCOLLOIDS
(2021)
Article
Multidisciplinary Sciences
Bruna C. Leopercio, Mariano Michelon, Marcio S. Carvalho
Summary: This study experimentally investigates the flow of monodispersed gellan gum microcapsules through a constricted capillary tube by measuring the evolution of pressure difference and flow visualization. The maximum pressure difference and capsule deformation for capsules with different diameter and shell thickness were obtained. Mapping the conditions at which the capsule membrane ruptures during the flow and releases its internal phase was also conducted.
SCIENTIFIC REPORTS
(2021)
Article
Energy & Fuels
P. K. P. Reis, M. S. Carvalho
Summary: This study introduces a pore-network model to simulate liquid deposition and its impact in gas-condensate reservoirs. The model considers flow under different gas and liquid saturations, and updates phase properties through PT-flash. Analysis based on coreflooding experiments demonstrated good predictive capability of the model for relative permeability curves.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Chemical
Paulo Roberto C. Mendes Junior, Ivan R. Siqueira, Roney L. Thompson, Marcio S. Carvalho
Summary: This study investigates planar extrudate swell flows of Newtonian liquids with a viscous liquid-gas interface. Results demonstrate that the extrudate swells dramatically as the interfacial viscosity grows, indicating a clear relationship between parameters.
Article
Chemistry, Physical
Tatiana Porto Santos, Mariano Michelon, Marcio Silveira Carvalho, Rosiane Lopes Cunha
Summary: Undesirable oil-in-water emulsions formed during biotechnological processes hinder the recovery of oil-based bioproducts. A thorough understanding of the formation and stability of emulsions, as well as careful selection of antifoaming agents, is crucial to address this issue. While antifoams can promote the formation of oil-phase emulsions, different antifoaming agents may have varying effects on emulsion stability.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Applied
Yun-Han Huang, Xiran Li, Mariano Michelon, Bruna C. Leopercio, Marcio S. Carvalho, John M. Frostad
Summary: This study investigated the aging of edible gellan gum microcapsules, revealing changes in structure, color, stability, and density, as well as precise rheological property measurements. As microcapsules aged, they transitioned from relatively soft and purely elastic to increasingly stiff and viscoelastic, ultimately losing integrity by shedding outer shell and aggregating.
FOOD HYDROCOLLOIDS
(2021)
Article
Engineering, Chemical
Aureliano Agostinho Dias Meirelles, Ana Leticia Rodrigues Costa, Mariano Michelon, Juliane Vigano, Marcio S. Carvalho, Rosiane Lopes Cunha
Summary: The study evaluated the use of glass microfluidic devices to produce emulsion-filled alginate microgels and investigated the effect of process variables on microgels size and polydispersity. Monodisperse particle size distribution of the microgels was observed, with size influenced by the viscosity of the O/W emulsion and the phases flow rates. These results demonstrate the potential of microfluidic processes for encapsulating lipophilic compounds in microgels.
JOURNAL OF FOOD ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Bruna C. Leopercio, Sergio Ribeiro, Frederico Gomes, Mariano Michelon, Marcio S. Carvalho
Summary: Magnetized microcapsules produced by microfluidics are studied for their response to external magnetic fields, with the response found to be dependent on the concentration of the ferrofluid, capsule diameter, and shell thickness.
MICROFLUIDICS AND NANOFLUIDICS
(2021)
Article
Mechanics
Alireza Mohammad Karim, Wieslaw J. Suszynski, Saswati Pujari, Lorraine F. Francis, Marcio S. Carvalho
Summary: The rheological characteristics of liquids play a critical role in the flow near dynamic contact lines. Effects of shear thinning and extensional thickening on liquid contact line dynamics in the curtain coating of polymer solutions were experimentally studied. Critical web speeds for heel formation and air entrainment were compared to behavior of a Newtonian liquid, with contact line dynamics described using dimensionless parameters.
Article
Chemistry, Physical
Talita Coffler Botti, Anthony Hutin, Erick Quintella, Marcio S. Carvalho
Summary: Several studies have investigated the relationship between the rheological properties of oil-water interfaces and the drainage time of a thin oil film between two aqueous drops. The results show that the properties of the structure formed at the oil-water interface are related to the absence of droplet coalescence. At low surfactant concentrations, the interface is weakly elastic and coalescence always occurs. At higher surfactant concentrations, a solid-like film forms at the interface, preventing further coalescence.
Article
Energy & Fuels
Willer P. Goncalves, Danmer M. Quinones, Abelardo B. Barreto Jr, Marcio S. Carvalho
Summary: Traditionally, oil well tests rely on pressure transient analysis (PTA) based on isothermal flow models. With the availability of accurate temperature records, non-isothermal models are now used for temperature transient analysis (TTA) to better characterize reservoir parameters. This study develops a numerical simulator that incorporates a non-isothermal model for well test analysis and solves the inverse problem of reservoir parameter characterization using multivariable optimization methods.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
