Article
Multidisciplinary Sciences
Dong Xu, Jianing Liu, Yunfeng Wu, Chunning Ji
Summary: We propose a simple and generalized Discretized Immersed Boundary Method (DIBM) that significantly improves efficiency by discretizing the interpolation functions and reusing a predefined universal interpolation stencil. DIBM achieves speedup ratios of 30-40 or even higher compared to conventional Immersed Boundary Method (IBM), with estimated errors below 1%.
SCIENTIFIC REPORTS
(2023)
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
Water Resources
Mojtaba Jandaghian, Abdelkader Krimi, Ahmad Shakibaeinia
Summary: The study presents a three-dimensional particle method based on an Enhanced Weakly-Compressible MPS approach for modeling immersed dense granular flows. By using a generalized rheological model and introducing a modified high-order diffusive term, the accuracy of the multiphase particle methods is improved, and experimental validation is conducted.
ADVANCES IN WATER RESOURCES
(2021)
Article
Engineering, Marine
Sung-Je Lee, Jang Hyun Lee
Summary: This study discusses the wear of marine vessels' hull plate caused by collisions with ice on the Arctic Sea route. A multi-phase approach is used to account for the behavior of ice particles affected by fluid force, and computational fluid dynamics and the discrete element method are employed to evaluate the motion of ice floes. The simulation results present the shape change of the hull surface due to wear, and the numerical procedures for predicting abrasive wear are discussed.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Review
Engineering, Chemical
Huaqing Ma, Lianyong Zhou, Zihan Liu, Mengyao Chen, Xiuhao Xia, Yongzhi Zhao
Summary: This paper reviews the development of CFD-DEM investigations for non-spherical particles in the past six years. It covers theoretical models, coupling methods, and applications. The research provides a deeper understanding of the complex flow behaviors between non-spherical particles and fluids, and improves the performance of related industrial processes.
Article
Computer Science, Interdisciplinary Applications
Tobias Tolle, Dirk Gruending, Dieter Bothe, Tomislav Maric
Summary: We propose a numerical method for calculating volume fractions from triangulated surfaces immersed in unstructured meshes. The method utilizes geometric calculations of signed distances and an approximate solution of the Laplace equation. It ensures high absolute accuracy and is applicable to triangulated surface models with technical geometrical complexity.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Computer Science, Interdisciplinary Applications
Martin Isoz, Martin Kotouc Sourek, Ondrej Studenik, Petr Koci
Summary: This study proposes a finite volume based CFD solver for mathematical modeling of the flow-induced movement of interacting irregular particles. The modeling approach uses a hybrid fictitious domain-immersed boundary method for inclusion of the solids and solves the particle movements and contacts using discrete element method (DEM). The new solver is implemented within the OpenFOAM framework and has been validated against literature data.
COMPUTERS & FLUIDS
(2022)
Article
Engineering, Multidisciplinary
Long Cheng, Lin Du, Xiaoyu Wang, Xiaofeng Sun, Paul G. Tucker
Summary: This paper presents a semi-implicit immersed boundary body force model to directly predict the fluid-induced sound from moving objects. A prediction-correction technique is used to overcome the conflict of grid quality and efficiency in high-order computational aeroacoustics methods. The results show that the model is effective in predicting interaction noise.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Chris Chartrand, J. Blair Perot
Summary: This paper presents a new method for generating locally orthogonal polygonal meshes from a set of generator points, considering polygon areas as a constraint. The method can be used for particle-based numerical computations and has advantages in incompressible fluid flow calculations.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Engineering, Environmental
Shaotong Fu, Limin Wang
Summary: A new algorithm called unresolved LBM-DEM is proposed for discrete particle simulation. It combines lattice Boltzmann method (LBM) for fluid phase and discrete element method (DEM) for particle phase, with immersed moving boundary (IMB) used for gas-solid coupling. The method has advantages in resolving Geldart A particles and computational efficiency, with GPU parallel computation implemented. Validation tests showed good agreement with experimental data and one to two orders of magnitude speed up compared to traditional algorithms. This suggests unresolved LBM-DEM as a promising strategy for fluidization and multiphase flows.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Mechanics
Zhenjiang Zhao, Ling Zhou, Ling Bai, Mahmoud A. El-Emam, Ramesh Agarwal
Summary: The coarse-grained (CG) CFD-DEM method reduces the number of particles by replacing multiple smaller particles with larger ones called parcels, and fully considers particle collisions. The investigation shows that the CG CFD-DEM method significantly decreases computation time in simulating dense gas-solid flows, and the results agree well with experimental data and fine-grained CFD-DEM method.
Article
Engineering, Mechanical
Lingxuan Li, Haonan Zhang, Zhuang Xing, Zhenwei Ma
Summary: This paper investigates the motion theory of particles in vibration machinery with an arc-shaped surface. The interaction mechanism between the vibration body and the particles is analyzed, and the kinematics equation of particles and the differential equation of vibration body movement are established. The feasibility of studying the whole motion law of particle flow using a small number of particles is verified using the discrete element method. The correctness of the mechanical model and numerical solution of the vibration system are also confirmed. The study provides a theoretical basis and experimental method for designing this type of mechanical equipment.
NONLINEAR DYNAMICS
(2022)
Article
Geochemistry & Geophysics
Kahlil F. E. Cui, Gordon G. D. Zhou, Lu Jing
Summary: Size segregation is a common feature in geophysical mass flow deposits, with active process during motion. The presence of interstitial fluids affects the motion of constituent particles and results in complex segregation behaviors. The effects of viscosity and density of interstitial fluids on particle size segregation rates are investigated through simulations, revealing the importance of fluid drag forces in the process.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Computer Science, Interdisciplinary Applications
M. Houssem Kasbaoui, Tejas Kulkarni, Fabrizio Bisetti
Summary: A novel moving immersed boundary method is proposed and applied in direct numerical simulations of swirling von Karman flow in laminar and turbulent regimes. The method is robust and stable, yielding excellent results in cases with static and moving boundaries. The transition from laminar to turbulent flow is analyzed by increasing the rotation rate of counter-rotating impellers, showing various flow features at different Reynolds numbers.
COMPUTERS & FLUIDS
(2021)
Article
Computer Science, Interdisciplinary Applications
Jinwei Bai, Yong Cao, Xiaoming He, E. Peng
Summary: This paper presents a two-dimensional implicit particle-in-cell model for simulating plasma problems, which combines the direct implicit particle-in-cell algorithm and the anisotropic immersed-finite-element method to significantly improve computational efficiency.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Computer Science, Interdisciplinary Applications
Liang Yang, Andrew Buchan, Dimitrios Pavlidis, Alan Jones, Paul Smith, Mikio Sakai, Christopher Pain
Summary: This paper introduces a novel three-phase interpenetrating continua model for simulating the interaction between water waves and porous structures. The model ensures mass conservation by using penalty forces and reduces computational cost with adaptive unstructured mesh modeling.
ENGINEERING COMPUTATIONS
(2021)
Article
Computer Science, Interdisciplinary Applications
Guangtao Duan, Takuya Matsunaga, Akifumi Yamaji, Seiichi Koshizuka, Mikio Sakai
Summary: Corrective matrix schemes are used in the MPS method to improve the accuracy of internal particles, especially in dealing with errors caused by free surface and wall boundaries. New corrective schemes are developed for Neumann boundary conditions, but instability issues remain, requiring the use of existing stable schemes. By applying stable schemes to the free surface and nearby particles and new corrective schemes to particles under a stable transitional layer, accuracy can be significantly enhanced.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2021)
Review
Engineering, Chemical
Chihiro Fushimi, Kentaro Yato, Mikio Sakai, Takashi Kawano, Teruyuki Kita
Summary: This review summarizes the recent progress in experimental and CFD studies on gas-solid cyclones, explaining the modified pressure drop model, scale-up methodology, and criteria for a single large cyclone vs. multiple cyclones. Future research perspectives are also discussed.
KONA POWDER AND PARTICLE JOURNAL
(2021)
Article
Engineering, Chemical
Yuki Tsunazawa, Nobukazu Soma, Mikio Sakai
Summary: This study clarifies the mixing mechanism of a pot blender using the discrete element method. The results show that the main mixing mechanism is convective mixing in the rotational direction and shear mixing in the axial direction. The particle filling ratio significantly influences the mixing efficiency, and the dependency of shear and diffusive mixing on Lacey's mixing index is also clarified.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Engineering, Chemical
Shuo Li, Guangtao Duan, Mikio Sakai
Summary: In this study, an advanced identification technique incorporating the POD method is developed to determine the main mixing mechanisms and investigate their transition. Results show that convection dominates the mixing mechanism in the early stage, while diffusion takes over in the late stage. The relation between POD modes and mixing mechanisms is established, indicating clumped and random spatial distributions of POD modes for convective and diffusive mixing, respectively. Combining CFD-DEM simulation with the LPOD method proves effective in identifying the main mixing mechanism and explaining the transition between convective and diffusive mixing.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Nuclear Science & Technology
Guangtao Duan, Akifumi Yamaji, Mikio Sakai
Summary: The study investigates the occurrence of local hot spots and RPV breach patterns during debris melting using the MPS method. It is found that large debris blocks may cause severe local hot spots and a lower breach point, while high decay power can result in the migration of local hot spots and limited ablation near the RPV wall.
ANNALS OF NUCLEAR ENERGY
(2022)
Article
Engineering, Environmental
Yuki Mori, Mikio Sakai
Summary: The ellipsoidal DEM/SDF model demonstrates the applicability and feasibility of non-spherical particles in industrial mixing process, which is crucial for the optimization of mixer design and operational conditions in chemical, food, and pharmaceutical engineering fields.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Multidisciplinary
Guangtao Duan, Takuya Matsunaga, Seiichi Koshizuka, Akira Yamaguchi, Mikio Sakai
Summary: This study investigates the instability issue at a free surface in semi-implicit particle methods using consistent schemes based on variable differences. A semi-analytical error-analysis method is proposed to clarify how biased neighbor support triggers error accumulation and instability. New free-surface-detection conditions are proposed to reduce error accumulation and improve simulation stability.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Guangtao Duan, Mikio Sakai
Summary: The accurate modeling of surface tension on free surfaces remains a challenging problem in meshfree particle methods. This study aims to extend a recent methodology to 3D and restore the capability of simulating topological changes. A new particle shifting method and contact angle model are proposed to address the problems of fluctuated free-surface boundaries and dynamic intersection with a wall boundary. The developed method is validated through numerical examples and shows improvement compared to previous techniques.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Mechanics
Kotaro Tamura, Yuki Mori, Kazuya Takabatake, Mikio Sakai
Summary: Comprehension of wet particle behavior is crucial in science and engineering. This study demonstrates the superiority and adequacy of the geometrical approximation model in the discrete element method simulation for wet particles through modeling and experimental validation.
Article
Engineering, Chemical
Shuo Li, Guangtao Duan, Mikio Sakai
Summary: This study proposes a nonintrusive reduced-order model (ROM-EL) for efficiently simulating gas-solid fluidized beds, and its effectiveness is demonstrated through validation studies. The proposed model significantly reduces the computational cost compared to the CFD-DEM method.
ADVANCED POWDER TECHNOLOGY
(2022)
Review
Engineering, Chemical
Qi Shi, Mikio Sakai
Summary: Powder transport systems are widely used in various industries and are influenced by system geometry, operating conditions, and particle properties. The discrete element method (DEM) provides detailed particle-scale information and has attracted research interests. This study reviews recent progress in DEM and coupled DEM with computational fluid dynamics for powder transport systems, covering single-particle, gas-solid/solid-liquid, and gas-solid-liquid flows. Special attention is given to important aspects and emerging applications that have not been well summarized before.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Engineering, Chemical
Shuo Li, Guangtao Duan, Mikio Sakai
Summary: In this study, the LPOD technique is incorporated into numerical simulations of particle systems to evaluate particle mixing and validate the adequacy of a coarse-grained DEM. The results demonstrate the importance of POD analysis in understanding particle system behavior and validating numerical simulations.
Article
Thermodynamics
Guangtao Duan, Mikio Sakai
Summary: A quasi-sharp-interface model (QSIM) was proposed for selective laser melting, which effectively prevented gas entrapment issues and its capability was verified through simulations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Qi Shi, Mikio Sakai
Summary: Powder mixing is critical in various industries, and container blender is popular due to its easy manufacturing and convenient operation. However, the impact of air-particle interactions on powder mixing has not been scientifically understood. This novel study investigates the effects of particle size and air presence on powder mixing, clarifying the relationship between particle-fluid dynamics and mixing performance for the first time.
