Article
Computer Science, Interdisciplinary Applications
Junxiang Yang, Zhijun Tan, Sangkwon Kim, Chaeyoung Lee, Soobin Kwak, Junseok Kim
Summary: This study presents a method for simulating fluid flows on curved surfaces in three-dimensional space. By using the finite volume lattice Boltzmann method and unstructured triangular meshes, the proposed method offers an efficient solution for fluid flows on curved surfaces.
ENGINEERING WITH COMPUTERS
(2022)
Article
Nuclear Science & Technology
Yahui Wang, Yu Ma
Summary: The paper presents an unstructured finite-volume lattice Boltzmann method (UFVLBM) for detailed multi-group neutron transport SP3 simulation on unstructured geometries. The UFVLBM can accurately solve the multi-group neutron transport SP3 problems and flexibly adapt to unstructured geometries. This work may provide novel ideas for solving neutron physics simulations on complex unstructured geometries.
ANNALS OF NUCLEAR ENERGY
(2022)
Article
Engineering, Marine
Jaeyoung Jung, Jin Hwan Hwang
Summary: A hybrid mesh-particle method was developed to simulate hydro- and morpho-dynamics in shallow flows. By implementing cross-computation and information exchange, the numerical instability problem was solved, achieving satisfactory results.
Article
Thermodynamics
Ji-Wang Luo, Li Chen, ZiHan Wang, WenQuan Tao
Summary: This paper presents a topology optimization method for thermal cloak design based on the adjoint lattice Boltzmann method and the level-set method. The method is efficient and scalable, and has been applied to design a thermal cloak using common isotropic bulk materials. The results demonstrate the effectiveness, robustness, and flexibility of the method in practical thermal cloak design.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Yangyu Guo, Moran Wang
Summary: In this work, a lattice Boltzmann scheme was developed to numerically solve the phonon Boltzmann equation, modeling the transition of heat transport from diffusive regime to hydrodynamic regime and successfully capturing phonon hydrodynamic phenomena.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Zhangyan Zhao, Mengke Wen, Weidong Li
Summary: This study introduces a coupled gas kinetic BGK scheme based on the finite volume lattice Boltzmann method for nearly incompressible thermal flows. The method determines fluxes analytically to reduce numerical dissipation and adopts implicit collision for efficiency improvement. Numerical results confirm the accuracy and reliability of the proposed scheme.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Multidisciplinary
Lei Wang, Zhouchao Wei, Tianfu Li, Zhenhua Chai, Baochang Shi
Summary: The study presents a lattice Boltzmann method to model the electrohydrodynamic conduction phenomenon in dielectric liquids, with good agreement found through validation against analytical solutions and experimental data. The research further investigates the fluid circulation in a square cavity generated by EHD conduction, highlighting the role of geometric scale and charge mobilities. Additionally, the characteristics of EHD conduction mechanisms in different regimes are analyzed, showing influences of conduction number W-0 and parameter beta related to Onsager effect.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Computer Science, Interdisciplinary Applications
Mengke Wen, Yu Wang, Weidong Li, Zhangyan Zhao
Summary: This work improves the recently proposed gas kinetic Bhatnagar-Gross-Krook (BGK) scheme for finite volume lattice Boltzmann method (FVLBM) to enhance numerical stability. Two striking features are introduced in the present improved method: the introduction of two auxiliary distribution functions, (f) over bar (alpha) and (f) over tilde (alpha), with collision effect included, and the application of an auxiliary distribution function (f) over tilde (alpha) to the reconstructed fluxes on the cell interfaces. These features enhance the numerical stability of the method and allow for higher Delta t/tau compared to the original scheme.
COMPUTERS & FLUIDS
(2023)
Article
Mathematics, Applied
Radek Fucik, Robert Straka
Summary: The presented method is applicable to a general matrix lattice Boltzmann method for deriving equivalent finite difference equations and subsequent equivalent partial differential equations, which can be used for advection diffusion equations and Navier-Stokes equations. The algorithm for obtaining coefficients and deriving equations is implemented for different velocity models, ensuring finiteness and convergence after a certain number of iterations. The implementation is done in C++ with the GiNaC library and is available under the GNU general public license (GPL).
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Thermodynamics
M. Mohammadi, S. A. Gandjalikhan Nassab
Summary: The immersed boundary method (IBM) is used to simulate the radiation heat transfer with natural convection in irregular geometries, employing the Lattice Boltzmann method with double multiple relaxation-time (MRT) and the finite volume method. The study found that IBM performed well in irregular geometries under the influence of Rayleigh number, Planck number, and optical thickness, demonstrating an attractive effect of radiation heat transfer through static and Hopf bifurcation. The significant advantage of IBM lies in using a unique mesh to simulate these problems.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Computer Science, Interdisciplinary Applications
Lubomir Bures, Yohei Sato, Andreas Pautz
Summary: This paper presents a novel implementation of the piecewise linear interface-capturing volume-of-fluid method in axisymmetric cylindrical coordinates, with analytical solutions for forward and inverse reconstruction problems to significantly speed up computing time. The numerical implementation and coupling with a Navier-Stokes solver are detailed, with verification of correct implementation and successful solution of basic transport problems. Validation tests with measured data show good agreement between simulation results and experimental data, confirming the effectiveness of the method.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Mathematics, Applied
Takashi Yodono, Kentaro Yaji, Takayuki Yamada, Kozo Furuta, Kazuhiro Izui, Shinji Nishiwaki
Summary: In this paper, a topology optimization method for isotropic linear elastic body problems using LBM is proposed. The analysis approach of the isotropic linear elastic field using LBM is constructed by incorporating the expansion technique of the governing equations. The design sensitivity is derived using the adjoint lattice Boltzmann method. The validity of the proposed method is demonstrated with numerical examples.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2022)
Article
Mathematics
Oleg Ilyin
Summary: In the entropic lattice Boltzmann approach, the parameter alpha governs the stability properties and viscosity of a flow. This study addresses the problem of evaluating alpha to secure the fulfillment of the discrete H-theorem with an average value close to alpha = 2. The proposed method approximates the H-function by a quadratic function and derives an analytical expression for alpha based on the entropy balance requirement. Simulation results validate the formula by demonstrating very small excessive dissipation.
Article
Physics, Fluids & Plasmas
Lei Xu, Rongliang Chen, Xiao-Chuan Cai
Summary: This paper presents a novel finite-volume discrete Boltzmann method for inviscid compressible flows, which is validated through seven benchmark problems. The method demonstrates close to linear strong scalability in parallel implementation.
Article
Engineering, Aerospace
Chen Yang, Ran Niu, Peng Zhang
Summary: Liquid slosh phenomenon in aerospace engineering was studied using Finite Volume Method (FVM) and Lattice Boltzmann Method (LBM) to evaluate slosh behavior under different container designs. The effectiveness of the models was validated with experimental data, showing that inserting baffles can suppress liquid slosh. LBM model demonstrated time efficiency and effectiveness compared to FVM model, with computational time cost only 7.0% of FVM model without compromising accuracy. This supports the future use of LBM model in quick design evaluation of slosh-like problems.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)