Article
Engineering, Mechanical
R. Harish, R. Sivakumar
Summary: This paper investigates the heat transfer characteristics of nanofluids within a wide range of Grashof numbers through numerical simulation. The study indicates that the random Brownian motion of nanoparticles enhances thermal convection, and the effect of volume fraction is more significant in transitional flows.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Thermodynamics
Shivakumar Kandre, Dhiraj V. Patil
Summary: Numerical simulation studies were conducted on buoyancy-driven natural convection and lid-driven mixed convection in a two-dimensional square enclosure using the Bhatnagar-Gross-Krook collision model-based lattice Boltzmann method. The effect of various non-dimensional numbers on total entropy generation, average Nusselt number on the hot wall, and Bejan number was investigated. It was found that the total entropy generation is linearly dependent on the Rayleigh number and irreversibility ratio, and decreases with decreasing Prandtl number. The Bejan number reaches a minimum value at the maximum total entropy generation. The study also revealed the significant contribution of fluid friction irreversibilities and the influence of buoyancy and velocity variations on entropy generation in different flow regimes.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Thermodynamics
K. Thanesh Kumar, Shreedevi Kalyan, Mangala Kandagal, Jagadish V. Tawade, Umair Khan, Sayed M. Eldin, Jasgurpreet Singh Chohan, Samia Elattar, Ahmed M. Abed
Summary: The effect of heat and mass transfer on mixed convection flow field with porous matrix in a vertical channel is investigated analytically. The analytical solutions of the coupled nonlinear differential equations for velocity, temperatures, and concentrations are obtained and shown graphically. The results obtained using regular perturbation method are considered favorable due to the lack of previous investigations in this area. Various flow characteristics are studied for different parameters, including Grashof number, Reynolds number, Brinkman number, heat generation/absorption parameter, and porous parameter. It is found that an increase in the Grashof number leads to an increase in buoyancy, resulting in an increase in fluid flow for heat generation and absorption.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Sheng Chen, Wenhao Li, Hayder Mohammed
Summary: This study investigates the heat transfer characteristics of natural convection of large Prandtl number fluids in porous media using a novel lattice Boltzmann approach. It reveals significant differences between large and small Prandtl number fluids, with the former more easily transitioning from a convection-dominated process to a conduction-dominated one in porous media.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Mechanics
Ao Xu, Ben-Rui Xu, Li-Sheng Jiang, Heng-Dong Xi
Summary: In this study, we numerically investigate the production and transport of vorticity in two-dimensional Rayleigh-Benard convection. The flow structure and temperature distribution are found to be greatly influenced by the interaction of multiple vortices. Besides vorticity produced by wall shear stress, buoyancy also plays a significant role in generating vorticity in the bulk region. The produced vorticity is then transported through advection and diffusion. The visualization of buoyancy-produced vorticity contours allows for the observation of main and corner vortices. The correlation between the spatial distribution of vorticity flux along the wall and the Nusselt number suggests a direct relationship between the amount of vorticity entering the flow and the amount of thermal energy entering the flow.
Article
Thermodynamics
Yan-Yan Feng, Cun-Hai Wang, Yong Xiang, Xin-Xin Zhang
Summary: Regulating natural convection heat transfer in porous media via internal thermal sources is crucial for thermal engineering applications. Numerical simulations in a square cavity filled with a porous medium reveal that changing the location, size, and number of thermal sources has varying effects on convection heat transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Guoqiang Wu, Sheng Chen
Summary: This paper investigates the collision between a moving droplet and a moving particle with heat transfer using the lattice Boltzmann method and a modified immersed boundary method. The influence of Prandtl number (0.1 <= Pr <= 10) and Grashof number (-100 <= Gr <= 100) is considered. The results indicate that the vertical velocity of the particle (Uz) increases with the increment of Pr and Gr. Uz is divided into three stages based on Pr and Gr >= 0, and four stages for Gr = -100. Particularly, in the last stage (when the droplet separates from the particle), Uz only varies slightly.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
Kosuke Suzuki, Takaji Inamuro, Aoi Nakamura, Fuminori Horai, Kuo-Long Pan, Masato Yoshino
Summary: The lattice Boltzmann method (LBM) is a numerical method for incompressible viscous fluid flows that has recently seen more complex collision models to enhance numerical stability. This paper proposes simple extended LBMs with good stability using the lattice kinetic scheme (LKS), which is improved by the linkwise artificial compressibility method (LWACM) to reduce high-order dissipation errors in high Reynolds number flows. The study compares the numerical stability and accuracy of LBM, LKS, LWACM, and improved LKS in simulations of high Reynolds number shear layers and two-phase flows with large density ratios.
Article
Thermodynamics
Ezequiel O. Fogliatto, Alejandro Clausse, Federico E. Teruel
Summary: A new thermal lattice Boltzmann scheme is introduced for simulating heat transfer and phase change in multiphase flows. The model improves the equilibrium distribution function, source term, and relaxation matrix, resulting in a equation that recovers the macroscopic advection-diffusion equation and allows control of thermal diffusivity. The model is tested against real experimental conditions, showing good predictive capability.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Computer Science, Software Engineering
Wei Li, Yihui Ma, Xiaopei Liu, Mathieu Desbrun
Summary: This paper proposes a new solver for coupling the incompressible Navier-Stokes equations with a conservative phase-field equation to simulate multiphase flows. The resulting solver shows efficiency, versatility, and reliability in dealing with large density ratios, high Reynolds numbers, and complex solid boundaries.
ACM TRANSACTIONS ON GRAPHICS
(2022)
Article
Thermodynamics
Ezequiel O. Fogliatto, Alejandro Clausse, Federico E. Teruel
Summary: The study introduces a double-MRT lattice Boltzmann model for thermal multiphase flow, which can accurately simulate numerical tests with known analytical solutions and is validated through grid independency testing.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Environmental Sciences
Natanael Suwandi, Fei Jiang, Takeshi Tsuji
Summary: This study investigates the relative roles of viscosity ratio and capillary number on relative permeability of nonwetting and wetting fluids in a Berea sandstone model. The results show that increasing viscosity ratio leads to an increase in nonwetting fluid relative permeability and a decrease in wetting fluid relative permeability. Additionally, low capillary number significantly reduces nonwetting fluid relative permeability while wetting fluid relative permeability remains relatively unchanged. The correlation between viscosity ratio, capillary number, and nonwetting fluid relative permeability provides important insights for reservoir-scale simulations.
WATER RESOURCES RESEARCH
(2022)
Article
Computer Science, Software Engineering
Wei Li, Mathieu Desbrun
Summary: This paper presents an improved numerical simulation method that can accurately simulate complex fluid phenomena and effectively handle fluid-solid coupling. It introduces a series of numerical improvements in momentum exchange, interfacial forces, and two-way coupling to reduce simulation artifacts and expand the types of fluid-solid coupling that can be efficiently simulated. The benefits of the solver are demonstrated through challenging simulation results and comparisons to previous work and real footage.
ACM TRANSACTIONS ON GRAPHICS
(2023)
Article
Materials Science, Multidisciplinary
Shinji Sakane, Tomohiro Takaki
Summary: By introducing the two-relaxation-time and interpolated bounce-back models, a highly efficient acceleration method for PF-LB simulations was developed in this study, which can be used for simulating the solidification of alloys.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Thermodynamics
Yousef Kazemian, Mohammad Javad Sayyari, Javad Abolfazli Esfahani
Summary: In this study, a two-dimensional analysis of natural convection inside a porous cavity at pore-scale is conducted using the lattice Boltzmann method, focusing on the impact of pores geometry. The findings show that the geometry of pores, such as star, circular, and square shapes, significantly influences the flow behavior, with star pores exhibiting the highest Nusselt number on the hot wall.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Review
Thermodynamics
Radzi Abdul Rasih, Nor Azwadi Che Sidik, Syahrullail Samion
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2019)
Article
Thermodynamics
Siti Nurul Akmal Yusof, Yutaka Asako, Mohammad Faghri, Lit Ken Tan, Nor Azwadi Bin Che Sidik, Wan Mohd Arif Bin Aziz Japar
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2019)
Review
Thermodynamics
M. A. M. Irwan, C. S. Nor Azwadi, Y. Asako, J. Ghaderian
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Energy & Fuels
Omer A. Alawi, Haslinda Mohamed Kamar, A. R. Mallah, S. N. Kazi, Nor Azwadi Che Sidik
Article
Thermodynamics
Hong Wei Xian, Nor Azwadi Che Sidik, R. Saidur
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2020)
Article
Energy & Fuels
Navid Aslfattahi, R. Saidur, A. Arifutzzaman, R. Sadri, Nuno Bimbo, Mohd Faizul Mohd Sabri, Philip A. Maughan, Luc Bouscarrat, Richard J. Dawson, Suhana Mohd Said, Boon Tong Goh, Nor Azwadi Che Sidik
JOURNAL OF ENERGY STORAGE
(2020)
Article
Engineering, Marine
Saeed Jamei, Adi Maimun, Rasul Niazmand Bilandi, Nor Azwadi, Simone Mancini, Luigi Vitiello, Maria De Carlini
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2020)
Article
Thermodynamics
Syed Nadeem Abbas Shah, Syed Shahabuddin, Mohd Faizul Mohd Sabri, Mohd Faiz Mohd Salleh, Mohamad Azlin Ali, Nasir Hayat, Nor Azwadi Che Sidik, Mahendran Samykano, R. Saidur
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Muhammad Arif Bin Harun, Prem A. L. Gunnasegaran, Nor Azwadi Che Sidik, M'hamed Beriache, Javad Ghaderian
Summary: The study compared the thermal performance of loop heat pipes using different types of nanofluids, finding that the thermal resistance decreased with increasing mass concentration for diamond and Al2O3 nanofluids, while SiO2 nanofluid showed the opposite trend. Diamond nanofluid exhibited the lowest thermal resistance and better heat capacity and enhancement compared to Al2O3.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Proceedings Paper
Green & Sustainable Science & Technology
W. X. Hong, N. A. C. Sidik, R. Saidur
INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY AND GREEN TECHNOLOGY 2019
(2020)
Proceedings Paper
Green & Sustainable Science & Technology
M. A. M. Irwan, C. S. Nor Azwadi, Y. Asako
INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY AND GREEN TECHNOLOGY 2019
(2020)
Proceedings Paper
Green & Sustainable Science & Technology
Tung Hao Kean, Nor Azwadi Che Sidik
INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY AND GREEN TECHNOLOGY 2019
(2020)
Proceedings Paper
Green & Sustainable Science & Technology
Muhammad Arif Bin Harun, Nor Azwadi Che Sidik
INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY AND GREEN TECHNOLOGY 2019
(2020)
Proceedings Paper
Green & Sustainable Science & Technology
Wah Yen Tey, Kiat Moon Lee, Nor Azwadi Che Sidik, Yutaka Asako
INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY AND GREEN TECHNOLOGY 2018
(2019)
Proceedings Paper
Engineering, Mechanical
Hong Wei Xian, Nor Azwadi Che Sidik
1ST INTERNATIONAL POSTGRADUATE CONFERENCE ON MECHANICAL ENGINEERING (IPCME2018)
(2019)
Article
Mathematics, Applied
Junfeng Cao, Ke Chen, Huan Han
Summary: This paper proposes a two-stage image segmentation model based on structure tensor and fractional-order regularization. In the first stage, fractional-order regularization is used to approximate the Hausdorff measure of the MS model. The solution is found using the ADI scheme. In the second stage, thresholding is used for target segmentation. The proposed model demonstrates superior performance compared to state-of-the-art methods.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Dylan J. Oliver, Ian W. Turner, Elliot J. Carr
Summary: This paper discusses a projection-based framework for numerical computation of advection-diffusion-reaction (ADR) equations in heterogeneous media with multiple layers or complex geometric structures. By obtaining approximate solutions on a coarse grid and reconstructing solutions on a fine grid, the computational cost is significantly reduced while accurately approximating complex solutions.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Nathan V. Roberts, Sean T. Miller, Stephen D. Bond, Eric C. Cyr
Summary: In this study, the time-marching discontinuous Petrov-Galerkin (DPG) method is applied to the Vlasov equation for the first time, using backward Euler for a Vlasov-Poisson discretization. Adaptive mesh refinement is demonstrated on two problems: the two-stream instability problem and a cold diode problem.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Yizhi Sun, Zhilin Sun
Summary: This work investigates the convexity of a specific class of positive definite probability measures and demonstrates the preservation of convexity under multiplication and intertwining product. The study reveals that any integrable function on an interval with a polynomial expansion of fast absolute convergence can be decomposed into a pair of positive convex interval probabilities, simplifying the study of interval distributions and discontinuous probabilistic Galerkin schemes.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Bhagwan Singh, Komal Jangid, Santwana Mukhopadhyay
Summary: This paper examines the prediction of bending characteristics of nanoscale materials using the Moore-Gibson-Thompson thermoelasticity theory in conjunction with the nonlocal strain gradient theory. The study finds that the stiffness of the materials can be affected by nonlocal and length-scale parameters, and the aspect ratios of the beam structure play a significant role in bending simulations.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Guoliang Wang, Bo Zheng, Yueqiang Shang
Summary: This paper presents and analyzes a parallel finite element post-processing algorithm for the simulation of Stokes equations with a nonlinear damping term, which integrates the algorithmic advantages of the two-level approach, the partition of unity method, and the post-processing technique. The algorithm generates a global continuous approximate solution using the partition of unity method and improves the smoothness of the solution by adding an extra coarse grid correction step. It has good parallel performance and is validated through theoretical error estimates and numerical test examples.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Hao Xu, Zeng-Qi Wang
Summary: Fluid flow control problems are crucial in industrial applications, and solving the optimal control of Navier-Stokes equations is challenging. By using Oseen's approximation and matrix splitting preconditioners, we can efficiently solve the linear systems and improve convergence.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
Article
Mathematics, Applied
Zhengya Yang, Xuejuan Chen, Yanping Chen, Jing Wang
Summary: This paper focuses on the high-order stable numerical solutions of the time-space fractional diffusion equation. The Fourier spectral method is used for spatial discretization and the Spectral Deferred Correction (SDC) method is used for numerical solutions in time. As a result, a high-precision numerical discretization scheme for solving the fractional diffusion equation is obtained, and the convergence and stability of the scheme are proved. Several numerical examples are presented to demonstrate the effectiveness and feasibility of the proposed numerical scheme.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2024)
