Article
Computer Science, Interdisciplinary Applications
Simon Gsell, Julien Favier
Summary: The study analyzed the boundary slip error caused by the interpolation/spreading non-reciprocity of the direct-forcing immersed-boundary method, and proposed a correction method to improve the no-slip condition without requiring additional computational time or implementation effort. This a priori correction significantly enhanced the accuracy of the method.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Kun Zhou, S. Balachandar
Summary: The study investigates the application and performance of the immersed boundary method in simulating rigid particulate flows, introducing new findings such as the solution to a least-squares error problem and the optimal choice of Lagrangian volume-weight. It also highlights the importance of high-resolution grids and small time steps for obtaining high-precision simulation results.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Engineering, Multidisciplinary
Junsheng Zeng, Heng Li, Dongxiao Zhang
Summary: This paper presents a resolved CFD-DEM method based on the immersed boundary method to simulate the proppant transport process in the oil and gas industry, utilizing a multi-sphere model to describe complex particle shapes and efficiently solving particle-particle interactions. The approach is validated through various benchmarks, including settling tests, and demonstrates robustness and efficiency in simulating fluid-particle coupling flow with complex particle shapes.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Physics, Multidisciplinary
Pooja Yadav, Sudeshna Ghosh
Summary: Studied the settling of impermeable and permeable planktonic shaped structure in a fluid domain. Numerical studies were conducted to investigate the impact of parameters on settling velocity, showing that the terminal velocity of permeable structure is higher and increases with increasing permeability.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Engineering, Multidisciplinary
Rafi Sela, Efi Zemach, Yuri Feldman
Summary: The extended immersed boundary methodology uses a semi-implicit direct forcing approach with a Schur complement method to enforce kinematic constraints for immersed surfaces in incompressible flow simulations. By utilizing parallel file systems for data handling, this methodology can be integrated into pressure-velocity segregated solvers for efficient computation. The methodology accurately meets the no-slip kinematic constraints on immersed oscillating bodies, as demonstrated in simulations of flows with out-of-phase oscillating spheres.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Antoine Michael Diego Jost, Stephane Glockner
Summary: The article proposes linear/quadratic square shifting methods to improve the accuracy and convergence of ghost-cell immersed boundary methods for Cartesian grids. The methods aim to increase the order of convergence while maintaining a maximum stencil size of 2, and are evaluated through a comprehensive verification and validation process.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Mathematics, Applied
Cheng-Shu You, Po-Wen Hsieh, Suh-Yuh Yang
Summary: In this paper, a direct-forcing immersed boundary projection method is developed for simulating the dynamics in thermal fluid-solid interaction problems. This method treats the solid as made of fluid and introduces virtual forcing terms to control the velocity and thermal boundary condition. The method is conceptually simple and easy to implement, and numerical experiments demonstrate its high performance.
ADVANCES IN APPLIED MATHEMATICS AND MECHANICS
(2022)
Article
Mathematics, Applied
Cheng-Shu You, Po-Wen Hsieh, Suh-Yuh Yang
Summary: In this paper, a direct-forcing immersed boundary projection method is developed for simulating the dynamics in thermal fluid-solid interaction problems. The method treats the solid as fluid and introduces virtual forcing terms to satisfy the prescribed velocity and thermal boundary conditions. The advantages of the method are its conceptual simplicity and ease of implementation, and numerical experiments show its high performance.
ADVANCES IN APPLIED MATHEMATICS AND MECHANICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Tiantian Xu, Jung-Il Choi
Summary: Efficient monolithic immersed boundary projection methods with staggered time discretization were proposed for incompressible viscous flows with heat transfer. The main idea is to use a two-step approximate lower-upper decomposition technique to decouple the momentum and energy equations, including immersed boundary forcing. Various MIBPM variants based on forcing schemes were numerically evaluated. The proposed MIBPM presents accurate imposition of no-slip conditions and exhibits good stability for both two-dimensional and three-dimensional heat transfer flows over moving objects.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Mechanics
Hua Zhou, Evatt R. Hawkes, Timothy C. W. Lau, Rey Chin, Graham J. Nathan, Haiou Wang
Summary: Point-particle direct numerical simulations were used to quantify the turbulence modulation and particle responses in a turbulent particle-laden jet in the two-way coupled regime. The results showed that the presence of particles both reduced and increased the gas-phase turbulent kinetic energy in different regions. The particle response to the gas-phase flow was found to be stronger in the axial velocity component.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Desta Goytom Tewolde, Zi-Hsuan Wei, Ming-Jyh Chern
Summary: The study introduces a new numerical method for modeling volumeless and thin rigid bodies using the direct forcing immersed boundary (DFIB) method. By developing an algorithm based on the solid volume function (VOS), the study accurately identifies thin, rigid structure boundaries in fluid flow. The validation results confirm the effectiveness of the proposed method in simulating thin, volumeless, rigid structures in incompressible turbulent flows.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2023)
Article
Environmental Sciences
Rekha Panghal, Sudeshna Ghosh
Summary: This study investigated the gravitational settling of a flexible, permeable circular and planktonic particle in a fluid. The results showed that the flexibility and permeability of the particle affect the settling velocity and shape deformation.
INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
(2023)
Article
Engineering, Chemical
Shenxu Qin, Maoqiang Jiang, Kuang Ma, Jin Su, Zhaohui Liu
Summary: An efficient immersed boundary-lattice Boltzmann method (IB-LBM) is proposed for fully resolved simulations of suspended solid particles in viscoelastic flows. The method is validated and applied to various scenarios, demonstrating its capability in studying the complex behaviors of viscoelastic particle suspensions.
Article
Chemistry, Physical
Takuya Kobayashi, Gerhard Jung, Yuki Matsuoka, Yasuya Nakayama, John J. Molina, Ryoichi Yamamoto
Summary: This study investigates the motion of passive and active squirming particles in Newtonian and viscoelastic fluids using the smoothed profile (SP) method. The results show that fluid elasticity significantly affects the behavior and velocity of the particles. Swirling flow generated by the squirmer's surface velocity enhances their swimming speed, and pushers outperform pullers in viscoelastic fluids. The investigation of velocity field and polymer conformation reveals that the increased propulsion is caused by pusher-like extensional flow characteristics and asymmetric polymer conformation distribution around swirling squirmers.
Article
Chemistry, Physical
Takuya Kobayashi, Gerhard Jung, Yuki Matsuoka, Yasuya Nakayama, John J. Molina, Ryoichi Yamamoto
Summary: This study applies the smoothed profile method to simulate the motion of squirming particles in Newtonian and viscoelastic fluids. Fluid elasticity significantly affects the transient behavior and steady-state velocity of the particles. Swirling flow enhances the swimming speed, and pushers outperform pullers in viscoelastic fluids.
Article
Thermodynamics
Hualin Xiao, Kun Luo, Tai Jin, Jiangkuan Xing, Min Chai, Jianren Fan
Summary: This study investigates the influence of combustion on scaled kinetic energy transport in a swirling partially premixed flame under gas turbine conditions.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Engineering, Chemical
Linhang Zhu, Zhongyang Zhao, Chang Liu, Wenjun Li, You Zhang, Yongxin Zhang, Chenghang Zheng, Kun Luo, Xiang Gao
Summary: This study investigates the hydrodynamics and cohesive-like characteristics of solid particles in a pseudo-2D droplet gas-solid fluidized bed using two-way coupled CFD-DEM numerical simulations. The results show that the presence of droplets leads to poorer fluidization characteristics, with increased surface tension resulting in inadequate mixing and higher liquid viscosity causing slower particle motion. The choice of contact angle is crucial for optimizing the fluidization quality, and injecting more droplets results in worse mixing, although the number of injected droplets has no significant effect on the flow pattern and particle motion.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Energy & Fuels
Yicun Wang, Ruipeng Cai, Changxiao Shao, Kun Luo, Jianren Fan
Summary: In this study, a novel tabulated spray flamelet/progress variable model (TSFPV) is developed to address the challenges of turbulent spray flames. The model introduces an additional mixture fraction to describe the mixing process and solves the problem of non-monotonicity in spray flame structure. The model is validated through simulations and shows good agreement with detailed chemistry solutions, accurately capturing the double-reaction spray flame structure and providing accurate predictions for temperature and minor intermediate products.
Article
Mechanics
Linfei Li, Tai Jin, Liyong Zou, Kun Luo, Jianren Fan
Summary: This paper numerically investigates the Richtmyer-Meshkov instability of a flat gas interface driven by perturbed and reflected shock waves. The flat gas interface evolves into a lambda-shaped structure with a central N-2 cavity and steps on both sides due to the impact of the perturbed shock wave. After the secondary collision of the reflected shock wave, the interface undergoes phase inversion and evolves into a bubble and spike structure. Three cases of different Atwood numbers are studied, comparing the collision time and position of the reflected shock wave and interface, as well as the induced spikes, bubbles, and gas mixing in detail. The formation of spikes and bubbles is related to the baroclinic vorticity highlighting the RM instability.
Article
Engineering, Chemical
Dali Kong, Shuai Wang, Kun Luo, Jianren Fan
Summary: Biomass gasification combined with CO2 absorption-enhanced reforming was numerically studied in a BFB reactor using the MP-PIC method. The effects of operating parameters on particle behaviors, bubble dynamics, and reactor performance were analyzed. A lower operating pressure improved gas-solid contact efficiency and performance, while higher temperature and S/B ratio promoted H2 generation but deteriorated gasification performance. Mixed bed material significantly improved gasification performance by enhancing H2 generation and CO2 removal.
Article
Mechanics
Mengzhen Cheng, Haiou Wang, Kun Luo, Jianren Fan
Summary: In this study, the flow-flame structures and turbulence-flame interactions of a laboratory-scale lean premixed reacting jet in cross-flow were explored through direct numerical simulation. Both non-reacting and reacting cases were simulated, and it was found that the reacting jet penetrates deeper in the cross-flow with a weaker shear layer compared with the non-reacting one. The flame structure in the reacting case showed significant variations in reaction intensity in different flame zones.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Dong Li, Yuqi Liu, Kun Luo, Jianren Fan
Summary: This study proposes an integral method to accurately determine the mean skin friction in a zero-pressure-gradient turbulent boundary layer. By assuming a linear relation for the weighted total shear stress in the near-wall region, the method requires only one streamwise location to evaluate the skin friction using the wall-normal profiles of the mean streamwise velocity and Reynolds shear stress. The method is validated using direct numerical simulation and experimental data, and is found to provide accurate results within +/- 4% compared to published values.
Article
Engineering, Chemical
Dali Kong, Shuai Wang, Jiahui Yu, Debo Li, Kun Luo, Jianren Fan
Summary: The improvement of external-loop and in-furnace non-uniformity of a 300 MWth industrial-scale circulating fluidized bed (CFB) with multiple cyclones by a dual-side coal feeding mode was numerically quantified. The dual-side coal feeding mode showed superiority over the traditional single-side coal feeding mode in terms of final mixing degree, residence time of coal particles, solid flux characteristics, temperature range, combustion efficiency, and emissions reduction.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Biology
Jingyang Luan, Yonghui Qiao, Le Mao, Jianren Fan, Ting Zhu, Kun Luo
Summary: This study investigates the role of the aorta distal to the stent in distal stent graft-induced new entry tear (dSINE) in thoracic endovascular aortic repair (TEVAR) for type B aortic dissection (TBAD). The findings suggest that the inverted pyramid structure and increased von Mises stress in the true lumen distal to the stent may contribute to the occurrence of dSINE. The enlargement of the true lumen distal to the stent appears to be a prelude to dSINE.
COMPUTERS IN BIOLOGY AND MEDICINE
(2023)
Article
Engineering, Multidisciplinary
Yonghui Qiao, Jianren Fan, Kun Luo
Summary: The mechanism of energy loss in healthy aortic blood flow is explored using clinical measurements and computational modeling techniques. The primary causes of energy loss are viscous friction and aortic wall deformation. These findings can inform the development of new hemodynamic markers and clinical assessment tools for vascular wall health.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Mechanics
Yanlu Chen, Buyun Xu, Yuzhou Cheng, Kun Luo, Jianren Fan, Meixiang Xiang
Summary: This study compares the hemodynamic differences between thrombus-positive and thrombus-negative patients in the early stages of the disease. The results show that the velocity and shear strain rate of the endocardial and epicardial geometries exhibit relative consistency. Differences in wall shear stress mainly occur at the LAA entrance, while oscillatory shear index differences are affected by geometry. Endothelial cell activation potential and relative residence time differences are concentrated at the tip of the LAA, but reliable parameters can be obtained after excluding outliers.
Article
Thermodynamics
Yicun Wang, Changxiao Shao, Kun Luo, Ruipeng Cai, Tai Jin, Jianren Fan
Summary: In this paper, the authors focus on the development and validation of the TSFPV model for simulating turbulent spray flames. The improved SEST model is used to generate the spray flamelet library, and the TSFPV model is verified on different flame configurations. The results show good agreement with experimental measurements, indicating the potential of the TSFPV model for spray combustion modeling.
Letter
Engineering, Multidisciplinary
Jinju Guo, Taoye Yin, Shuai Wang, Wei Chen, Peiwang Zhu, Kun Luo, Yun Kuang, Jie Liu, Junjun Huang, Bing Huo, Hui Wang, Chunlin Zhang, Jian Wang
Summary: The passage introduces a new type of battery with features such as high energy density, long cycle life, high safety, and scalability. Its main applications include electric vehicles, renewable energy storage, and smart grids. Additionally, the battery exhibits excellent performance indicators such as high rate charge-discharge, low self-discharge rate, and high energy efficiency. Experimental results demonstrate a specific energy density of 1000 MW and over 1000 cycles of durability, with stable operation in a wide temperature range. This study provides significant support for the preparation, performance optimization, and application prospects of this new battery.
JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
(2023)
Article
Thermodynamics
Kai Liu, Kun Luo, Yuzhou Cheng, Anxiong Liu, Haochen Li, Jianren Fan, S. Balachandar
Summary: This study develops an efficient and robust surrogate modeling framework based on physics-informed neural networks (PINNs) for parameterized combustion system design and optimization. The accuracy and predictive capability of the PINNs framework are validated through numerical simulations, and the implications for engineering applications are discussed. The results demonstrate the potential of PINNs as an efficient and physics-driven approach for visualization, design, optimization, and control of parameterized combustion systems.
COMBUSTION AND FLAME
(2023)
Article
Thermodynamics
Xin Liu, Qiang Wang, Kun Luo, Yanfei Mu, Haiou Wang, Jianren Fan
Summary: The study finds that using a liquid-cooled plate and metallic phase change material can improve battery thermal management. Gallium filling significantly reduces cell temperature and improves temperature dispersion uniformity, but a higher coolant mass flow rate has less impact on cell temperature and increases system energy consumption.
APPLIED THERMAL ENGINEERING
(2024)
Article
Mechanics
Nicolas Bouvet, Savannah S. Wessies, Eric D. Link, Stephen A. Fink
Summary: This study presents a framework to characterize firebrand flows and compare exposure through the use of a measurement device and data processing methods. The ability to perform exposure comparisons and recognize combustion states is demonstrated.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
P. Botticini, G. Lavalle, D. Picchi, P. Poesio
Summary: This study investigates the gravity-driven liquid layer problem on an inclined plate, taking into account the variable density of the fluid. The study examines the influence of density variation on the formulation of a depth-averaged model and the role of compressibility in long-wave interfacial instability.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Jean-Paul Caltagirone
Summary: This article introduces a method for modeling capillary flows on a surface or at the interface of two fluids. The method involves handling the two components of capillary acceleration using the divergence and curl of surface normal. The proposed formulation is characterized by directional curvature based on dihedral angle, intrinsic anisotropic surface tension per unit mass, and introduction of capillary potential.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Qi-Teng Zheng, Chun-Bai-Xue Yang, Shi-Jin Feng, Yu-Chen Song, Yong Zhao, Yu-Lin Wu
Summary: This paper proposes a new two-phase partitioning boundary model to accurately predict the drying process of a porous medium from saturated to unsaturated conditions. The model is validated through laboratory soil drying tests and the study also investigates the effects of air-water interfacial area and water retention parameters on the drying process.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Alexandra Metallinou Log, Morten Hammer, Svend Tollak Munkejord
Summary: Flashing flow is commonly found in industrial systems and accurate flashing models are essential for the design of safe and efficient CO2 transportation systems. We propose a homogeneous flashing model that takes into account the physical phenomena of phase change. The model is fitted using CO2 pipe depressurization data and we find that the same model parameters can be applied for different cases.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Q. Tan, S. A. Hosseini, A. Seidel-Morgenstern, D. Thevenin, H. Lorenz
Summary: The possible impact of temperature differences during crystal growth is investigated in this study. A numerical model is developed to simulate the crystallization dynamics of (S)-mandelic acid, taking into account temperature effects. The study shows that the heat generation at the crystal interface has only a small effect on the surrounding temperature field.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Hideki Murakawa, Sana Maeda, Sven Eckert
Summary: This study investigates the behavior of bubbles in a liquid metal under the influence of a magnetic field, particularly bubble chains. The results show that increasing the magnetic field strength suppresses the oscillations of the bubbles and concentrates their crossing positions in a specific area. Applying these findings to numerical models can further optimize continuous casting processes.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Johanna Potyka, Kathrin Schulte
Summary: This paper presents an advanced Volume of Fluid (VOF) method for performing three-dimensional Direct Numerical Simulations (DNS) of the interaction of two immiscible fluids in a gaseous environment with large topology changes. The method includes efficient reconstruction of phase boundaries near the triple line using a Piecewise Linear Interface Calculation (PLIC) method and enhanced surface force modeling with the Continuous Surface Stress (CSS) model. Implementation of these methods in the multi-phase flow solver Free Surface 3D (FS3D) yielded successful validation. The simulations provide valuable insights into the collision process and can support future modeling of immiscible liquid interaction.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Martin Rohde, Sebastian Burgmann, Uwe Janoske
Summary: This study investigates the effect of superimposing an incident flow and two-dimensional vibration on the critical air flow velocity required for the detachment of a droplet. The results show that oscillatory excitation at specific frequencies can significantly reduce the critical velocity for droplet detachment.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Tea-Woo Kim, Baehyun Min
Summary: Liquid-gas two-phase slug flow is a complex flow pattern in energy systems, and accurately predicting slug liquid holdup is crucial for system design and operation. Existing HLLS models have limited applicability due to a lack of physical basis. This study proposes a new dimensionless number SP and correlates it with HLLS data, resulting in a unified HLLS correlation that agrees closely with experimental data.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Christian Lieber, Stephan Autenrieth, Kai-Yannic Schoenewolf, Amy Lebanoff, Rainer Koch, Sterling Smith, Paul Schlinger, Hans-Joerg Bauer
Summary: The observation of acoustically levitated droplets offers great potential for studying their evaporation characteristics. The main objective of this study is to present an experimental setup that minimizes the disturbing effects of the levitation technique in order to investigate convective heat and mass transfer during droplet evaporation.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Facundo Cabrera-Booman, Nicolas Plihon, Mickael Bourgoin
Summary: The settling behavior of individual spheres in a quiescent fluid was experimentally studied. The mean trajectory angle with the vertical showed complex behavior as the parameters Gamma and Ga varied. The transition from planar to non-planar trajectories and the emergence of semi-helical trajectories were observed, especially for denser spheres.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Hongbin Wang, Hanwen Luo, Jinbiao Xiong
Summary: This article introduces an iterative screening method for closure models in nucleate boiling flow simulation, and demonstrates its accuracy through experiments.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Alexandra Metallinou Log, Morten Hammer, Han Deng, Anders Austegard, Armin Hafner, Svend Tollak Munkejord
Summary: This study investigates the rapid depressurization of liquid CO2 and compares the predictions of different models. It is found that higher temperatures result in shorter relaxation times.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
Article
Mechanics
Rizwan Zahoor, Sasa Bajt, Bozidar Sarler
Summary: This numerical study evaluates the jet characteristics of non-Newtonian power-law fluids in a gas dynamic virtual nozzle. The results show that shear-thinning fluids result in thicker, longer, and slower jets compared to shear-thickening fluids. Additionally, a dripping-jetting phase diagram of the nozzle is obtained by varying the power law index, gas, and liquid flow rates.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2024)
