Article
Physics, Fluids & Plasmas
Zhaoli Guo, Lian-Ping Wang, Yiming Qi
Summary: In this paper, a discrete unified gas kinetic scheme (DUGKS) is proposed for continuum compressible gas flows based on the total energy kinetic model. The DUGKS can be viewed as a special finite-volume lattice Boltzmann method for the compressible Navier-Stokes equations in the double distribution function formulation. The computational efficiency of the proposed DUGKS is much improved compared to previous versions.
Article
Mechanics
Dejia Zhang, Aiguo Xu, Yudong Zhang, Yanbiao Gan, Yingjun Li
Summary: This paper develops Discrete Boltzmann Models (DBMs) based on the ellipsoidal statistical Bhatnagar-Gross-Krook model to study non-equilibrium high-speed compressible flows that have various applications in engineering and science. Numerical tests demonstrate the model's ability to capture flow structures and TNE effects at different orders. The study is significant for understanding the behavior of complex fluid systems and choosing an appropriate fluid model to account for desired TNE effects.
Article
Mathematics, Applied
Xiang Zhao, Liming Yang, Chang Shu
Summary: This paper proposes a novel implicit lattice Boltzmann flux solver for simulating flows around complex geometries. The solver combines dual time-stepping technique and sub-iteration to efficiently simulate unsteady flows. Various simulations were conducted to demonstrate the accuracy and efficiency of the proposed solver, and it was also used to simulate the flow over complex aircraft models in practical engineering applications.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2022)
Article
Mechanics
Yi Zhou, Zhengdao Wang, Yuehong Qian, Hui Yang, Yikun Wei
Summary: This study presents a numerical investigation on flow around two square cylinders in different arrangements, revealing various flow patterns that can be categorized into three types depending on the spacing between the cylinders. The dependence of flow parameters on spacing is demonstrated, and the relationship between flow pattern and lift and drag coefficients is explored.
Article
Mechanics
Qin Xu, Zijian Zhuang, Yongcai Pan, Binghai Wen
Summary: In this paper, a super-resolution transformer is proposed to reconstruct turbulent flow fields with high quality. Through experiments on forced isotropic turbulence and turbulent channel flow datasets, the results show that the proposed method can recover the turbulent flow fields with high spatial resolution and capture small-scale details. It can also handle both isotropic and anisotropic turbulent properties even in complex flow configurations.
Article
Mathematics, Applied
Boyang Xia, Jun Li
Summary: This paper presents an efficient implementation of nodal discontinuous Galerkin lattice Boltzmann method, which improves computational efficiency while maintaining a certain level of accuracy. Numerical simulations of various benchmark cases demonstrate better accuracy and stability compared to the standard method.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2022)
Article
Construction & Building Technology
Marc Siodlaczek, Maximilian Gaedtke, Stephan Simonis, Marcel Schweiker, Naohiko Homma, Mathias J. Krause
Summary: This paper introduces a new thermal large eddy lattice Boltzmann method for transient turbulence modeling, successfully evaluating thermal comfort and improving the accuracy and model quality of simulations.
BUILDING AND ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Jia Xu, TieZhu Qiao, Qing Li, GuoWei Zhang, GuiRong Hao
Summary: This study proposes an optimization method of crystal rotation to improve the quality of crystal seeding under complex convection. By calculating and analyzing the unsteady melt flow rate, internal temperature of the melt, and crystal rotation speed, the results show that this method can effectively restrain melt convection and improve the temperature distribution on the surface of the melt.
Article
Thermodynamics
Alexander Nee, Ali J. Chamkha
Summary: This paper investigates the capability of hybrid lattice Boltzmann method in simulating developed turbulent buoyancy-driven flows. The numerical simulation shows that the hybrid approach accurately predicts the location of thermal plumes, despite a small error in heat transfer rate at high Rayleigh numbers.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Computer Science, Interdisciplinary Applications
Satoshi Saito, Masato Yoshino, Kosuke Suzuki
Summary: Bubbly flow problems were simulated to assess the effectiveness of the improved lattice Boltzmann method for incompressible two-phase flows. The method was found to accurately and efficiently compute two-phase fluid flows with high density ratios compared to the previous method. Different scenarios, including a stationary bubble, a single bubble rising in a liquid, two bubbles rising in a liquid, and slug and churn flows in a square duct, were simulated to demonstrate the applicability of the method to complex bubbly flow problems.
COMPUTERS & FLUIDS
(2023)
Article
Geosciences, Multidisciplinary
Lin Tian, Linfang Shen, Zhiliang Wang, Junyao Luo
Summary: This study utilizes the enthalpy method to establish a unified control equation for heat conduction, solving it numerically using the D2Q4 model of the lattice Boltzmann method. The evolution of the temperature field and solid-liquid phase change interface position with time is determined. The trends in the soil's temperature field evolution and freezing front movement under unilateral and bilateral cold sources are discussed, and the results provide a basis for engineering design.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Mechanics
Peifei Fan, Zhaowu Lin, Jian Xu, Zhaosheng Yu
Summary: In this study, a three-dimensional fictitious domain method is proposed for particulate flows with heat transfer. For the case of fixed particle temperature, an iterative scheme for the temperature Lagrange multiplier is proposed to overcome the spurious oscillation of the explicit scheme. Both explicit and implicit schemes are proposed for the solution of coupled fluid and solid temperature equations in the case of freely evolving particle temperature. The method is verified and applied to various test problems and simulations.
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
Physics, Fluids & Plasmas
Jinhua Lu, Nikolaus A. Adams
Summary: This paper analyzes several weakly compressible models and establishes a unified and simple framework, finding that all these models contain identical numerical dissipation terms, mass diffusion terms in the continuity equation, and bulk viscosity terms in the momentum equation, which provide general mechanisms for stabilizing computation. Referring to these mechanisms and the computational procedures of the lattice Boltzmann flux solver, two general weakly compressible solvers for isothermal and thermal flows are proposed. Detailed numerical investigations validate the good numerical stability and accuracy of these solvers, further supporting the general mechanisms and the general approach of constructing general weakly compressible solvers.
Article
Physics, Fluids & Plasmas
L. M. Yang, C. Shu, Z. Chen, Y. Y. Liu, J. Wu, X. Shen
Summary: A high-order gas kinetic flux solver (GKFS) is developed for 2D compressible flows, which evaluates numerical fluxes based on the local asymptotic solution to the Boltzmann equation. It achieves high-order accuracy through a simplified local asymptotic solution and outperforms the second-order counterpart in numerical examples, demonstrating its accuracy and capability.
Article
Mathematics, Applied
F. Almasi, M. S. Shadloo, A. Hadjadj, M. Ozbulut, N. Tofighi, M. Yildiz
Summary: This study discusses the application of mesh-less numerical method ISPH in investigating the behavior of multi-phase flow systems. The results validate the effectiveness and accuracy of the method through verification of various problems, and introduce the simulation of Electrohydrodynamics effect in Couette flow for the first time.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Mathematics, Applied
Mohammadreza DaqiqShirazi, Azeez A. Barzinjy, Samir M. Hamad, Rezvan Alamian, Mostafa Safdari Shadloo
Summary: This study conducted a numerical investigation on the transient characteristics of two-phase flow over circular staggered and inline micro pin fins, considering varying parameters. The results showed that increasing pin diameter hinders flow mixing near micropins, while a higher surface tension ratio promotes better flow mixing.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Thermodynamics
Akbar Maleki, Milad Elahi, Mamdouh El Haj Assad, Mohammad Alhuyi Nazari, Mostafa Safdari Shadloo, Narjes Nabipour
Summary: Nanofluids with high thermal conductivity are used to improve heat transfer in porous media. In this study, different methods were used to model the thermal conductivity of nanofluids containing ZnO particles, with artificial neural network (ANN) proving to be the most effective.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Biotechnology & Applied Microbiology
Sara Janati, Babak Aghel, Mostafa Safdari Shadloo
Summary: The investigation focused on the removal of CO2 using aqueous mixtures of MEA + DEA and MEA + TEA in a T-shaped microchannel. It was found that increasing liquid flow rate and amine concentration can improve CO2 removal efficiency, while increasing gas flow rate has a significant negative impact. Under optimal conditions, the maximum CO2 removal efficiency achieved was 97.9% for MEA + DEA and 91.9% for MEA + TEA. Additionally, the use of microchannel in CO2 absorption process significantly enhances the volumetric overall gas-phase mass transfer coefficient, offering a new approach for achieving high absorption percentage.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Editorial Material
Energy & Fuels
Akbar Maleki, Mohammad Alhuyi Nazari, Mostafa Safdari Shadloo, Weiping Zhang
FRONTIERS IN ENERGY RESEARCH
(2022)
Review
Agricultural Engineering
Babak Aghel, Sara Behaein, Somchai Wongwises, Mostafa Safdari Shadloo
Summary: This paper introduces the composition, application, and conversion of biogas into biomethane. It discusses the common technologies and recent studies on CO2 removal, as well as the merits and demerits of these methods.
BIOMASS & BIOENERGY
(2022)
Article
Energy & Fuels
Fatemeh Almasi, Manuel Hopp-Hirschler, Abdellah Hadjadj, Ulrich Nieken, Mostafa Safdari Shadloo
Summary: This paper investigates the coupled effects of electrohydrodynamic and thermocapillary on the dynamic behavior of a liquid droplet. The results show that when subjected to a vertical electric field and thermal gradient, the droplet stretches horizontally and approaches a break-up condition at a high rate of electrical permitivity. The combined effect of thermal gradient and electric field further pushes the droplet towards the break-up regime.
Article
Physics, Fluids & Plasmas
M. Celep, A. Hadjadj, M. S. Shadloo, S. Sharma, M. Yildiz, M. J. Kloker
Summary: Contrary to incompressible flows, there has been a major research gap in utilizing velocity streaks for flow transition control in supersonic flows. The present study investigates the controlling capability of decaying streak modes under different thermal boundary conditions using DNS. The results show that the stabilizing/destabilizing influence of the control streaks in a perturbed boundary layer is not significantly affected by the wall-boundary conditions.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Engineering, Multidisciplinary
Mehran Vakilha, Manuel Hopp-Hirschler, Mostafa Safdari Shadloo
Summary: This paper presents a new Lagrangian meshless method (EISPH) for solving multiphase flow problems. By approximating the pressure change between consecutive time-steps, this method can effectively solve multiphase flow problems with small time steps, and its accuracy is validated through comparisons with analytical solutions or existing literature.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Review
Green & Sustainable Science & Technology
Babak Aghel, Sara Janati, Somchai Wongwises, Mostafa Safdari Shadloo
Summary: This review article examines the procedure of CO2 removal through chemical amine solvents and the challenges associated with high energy requirements for solvent regeneration. The article investigates two approaches: the development of new solvents and the use of high-capacity amine blends, and the modification of operational conditions and integration with thermal power plants to reduce energy consumption.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Engineering, Multidisciplinary
Kitti Nilpueng, Preecha Kaseethong, Mehrdad Mesgarpour, Mostafa Safdari Shadloo, Somchai Wongwises
Summary: This study introduces a new physics-informed neural network (PINN)-based prediction method to determine the temperature pattern of fluid and fins when flow passes over plate-circular/plate-square pin fin heat sinks. The proposed method is based on calculating the velocity pattern on the fins' surface. After careful validation with experimental data and sensitivity analysis, the thermal behavior of the heat sinks are determined, showing temperature and vorticity differences between different heat sinks.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Thermodynamics
G. P. Vanitha, U. S. Mahabaleshwar, M. S. Shadloo
Summary: This study investigates the effects of suction/injection, radiation, thermophoresis, and permeable stretching sheet on mixed convection viscoelastic fluid flow and heat transfer. The nondimensionalized dimensional equation is solved analytically to analyze the behavior of physical parameters influencing temperature and concentration field. The results have significant importance in engineering applications where the heat transfer of the fluid is controlled.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Multidisciplinary
Sara Behaien, Babak Aghel, Mostafa Safdari Shadloo
Summary: In this study, biogas was upgraded by removing CO2 using three absorbents in a microchannel system. The effects of operating variables were investigated, and a quadratic model was proposed to predict the response. The experimental values matched the model values well.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Mehrdad Mesgarpour, Omid Mahian, Ping Zhang, Somchai Wongwises, Lian-Ping Wang, Goodarz Ahmadi, Sandro Nizetic, Mikhail Sheremet, Mostafa Safdari Shadlooj
Summary: Sedimentation has a direct impact on the thermal performance and efficiency of thermal systems. This study investigates the deposition of nanoparticles inside a tube for possible application in parabolic solar collectors. A combination of lattice Boltzmann and control finite volume methods is used for realistic simulation, and the results are used to train a deep feed-forward neural network to visualize and predict sedimentation behavior. This research provides valuable insights into particle behavior and parameter variation near the surface, and has implications for predicting service periods and cost savings in heat transfer equipment maintenance.
JOURNAL OF CLEANER PRODUCTION
(2023)
Review
Thermodynamics
Arman Haghighi, Akbar Maleki, Mamdouh El Haj Assad, Lingen Chen, Mohammad Alhuyi Nazari, Mostafa Safdari Shadloo
Summary: Heat pipes are widely used for thermal management in high heat flux devices. Special working fluids such as hydrogen, neon, and nitrogen are necessary for efficient heat transfer at very low temperatures. The performance of cryogenic heat pipes depends on factors like filling ratio, input power, and working fluid, with their effective thermal conductivity surpassing that of conductive metals significantly. Further research is recommended to enhance the performance of cryogenic heat pipes.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)