Article
Mechanics
Heiko Pleskun, Tobias Bode, Andreas Bruemmer
Summary: The mass flow rate of Couette flow in a long rectangular channel is calculated for various gas rarefaction levels and width-to-height ratios. Analytical solutions are derived for different width-to-height ratios in the hydrodynamic, slip, and free molecular regimes. Simulations using the direct simulation Monte Carlo method are performed in the transitional regime. The results, presented as tabulated data, can be applied to cases with constant or linear increasing wall velocity.
Article
Mechanics
Ming Zhu, Jian Huang, Qiang Zhou, Zhaohui Yao
Summary: This paper improves the stability of the gas-liquid interface by using a three-dimensional-printed composite structure with transverse posts and reentrant structures in a microchannel. The length of the gas-liquid interface above the groove increases from micrometers to millimeters due to the effect of the transverse posts. The lattice Boltzmann method is applied to analyze the improved stability and explore the factors affecting the stability of the gas-liquid interface in this structure, providing a theoretical foundation for structural optimization.
Article
Engineering, Aerospace
Kazimierz Adamiak
Summary: The algorithm utilizes a three-species fluid model and implements two approximate models for photoionization, with the accuracy of the model validated by comparing with experimental data.
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
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
Computer Science, Interdisciplinary Applications
Russel Caflisch, Denis Silantyev, Yunan Yang
Summary: This article explores two frameworks for approximating the gradient of an objective function constrained by the nonlinear Boltzmann equation using the adjoint-state method, and proposes an adjoint DSMC method for Boltzmann-constrained optimization. The properties and connections of the two frameworks are analyzed, and several numerical examples are presented to demonstrate their accuracy and efficiency.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Mechanics
Hao Yang, Jun Zhang
Summary: In this study, a new theoretical framework for the information preservation (IP) method based on kinetic theory is introduced to offer a complete understanding of the preserved information's transport properties. By introducing a velocity-information joint distribution function (VIJDF) and deriving its governing equation as well as the corresponding macroscopic transport equations, the accuracy of the IP method is ensured. Numerical simulations demonstrate that the IP method can achieve similar accuracy as the DSMC method with a much smaller sampling size.
Article
Mechanics
Shang-Gui Cai, Sajad Mozaffari, Jerome Jacob, Pierre Sagaut
Summary: This paper applies an immersed boundary-turbulence wall modeling approach to investigate turbulent flows over a generic car geometry, known as the Ahmed body. The study shows that the near-wall solution is significantly deteriorated compared to the body-fitted simulation, but enhanced wall treatments proposed in the literature can effectively address this issue.
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
Physics, Fluids & Plasmas
Chengliang Xuan, Weiyin Liang, Bing He, Binghai Wen
Summary: In this study, a scheme is presented to actively control the vertical positions of particles in inertial microfluidics by utilizing the boundary slip effect to regulate the fluid velocity distribution in microchannels. The results demonstrate the effective manipulation of particle equilibrium positions using a unilateral slip boundary, improving the accuracy and flexibility of particulate focusing, separating, and transport in inertial microfluidics.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Energy & Fuels
Xiangyu Liu, Liehui Zhang, Yulong Zhao, Xiao He, Jianfa Wu, Shaowen Su
Summary: In this study, the dimensionless relaxation time expression was modified and the Peng-Robinson equation of state (P-R EOS) was introduced to the microscale gas flow lattice Boltzmann model. Various transport mechanisms for shale gas flow in nanopores were considered, and the contributions of different factors to the total gas flow rate were studied. The results indicated that different transport mechanisms have varying influences on shale gas flow in nanopores under different conditions.
Article
Mechanics
Qing He, Shi Tao, Xiaoping Yang, Weijian Lu, Zongrun He
Summary: The study introduces the ghost-cell immersed boundary method into DUGKS to handle curved boundaries. Three typical test cases are simulated to validate the accuracy and feasibility of the new IDW-GC-DUGKS method for gaseous microflows.
Article
Engineering, Multidisciplinary
W. Liu, L. M. Yang, Z. L. Zhang, C. J. Teo, C. Shu
Summary: This paper proposes a simplified hydrodynamic-wave particle method (SHWPM) that combines Computational Fluid Dynamics (CFD) with the stochastic particle method to address multi-scale rarefied flows. The SHWPM automatically switches from the stochastic particle solver to the conventional CFD method in multi-scale simulations. By deriving weights based on the integral solution of the Boltzmann equation, the collision effects of particles are calculated in a macroscopic approach, significantly reducing the number of sampling particles in the near-continuum regime. Error analysis shows that the simplified treatment preserves the second-order accuracy and asymptotic preserving property of the method.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Mechanics
Shangfei Song, Di Fan, Yijia Fan, Bing Yan, Bohui Shi, Shengnan Zhang, Xiaofang Lv, Haiyuan Yao, Qingping Li, Jing Gong
Summary: Offshore pipelines are crucial for offshore oil and gas development and are often referred to as the lifeline of the production system. This study focuses on the development of component tracing technologies to predict fluid composition changes in pipeline networks. The proposed algorithm can dynamically track fluid composition and calculate phase exchange amounts in real time.
Article
Physics, Fluids & Plasmas
Matteo Lulli, Luca Biferale, Giacomo Falcucci, Mauro Sbragaglia, Xiaowen Shan
Summary: This study systematically analyzes the tensorial structure of lattice pressure tensors in multiphase lattice Boltzmann models, finding that the isotropy properties of lattice interaction forces may not be reflected in the lattice pressure tensor. By choosing a suitable multirange potentials, desired isotropy in lattice pressure tensors can be achieved, reducing the generation of spurious currents. The proposed analysis provides a new approach for implementing forcing symmetries in the Shan-Chen method for LBM, which is expected to be beneficial for future studies of nonideal interfaces.
Article
Construction & Building Technology
Ravi A. Patel, Sergey V. Churakov, Nikolaos I. Prasianakis
Summary: Cementitious materials in underground constructions are exposed to CO2 rich ground waters leading to carbonation and calcium leaching. A novel multi-level pore-scale reactive transport model is proposed to study microstructure changes. The modeling results show good agreement with experiments in the initial stages.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Multidisciplinary Sciences
N. Sawant, B. Dorschner, I. Karlin
Summary: A new lattice Boltzmann model for reactive ideal gas mixtures is proposed, which improves the kinetic model for Stefan-Maxwell diffusion and enhances thermodynamic consistency by incorporating the heat of formation to accurately describe the energy and temperature changes due to chemical reactions. The model is validated with benchmarks including laminar burning speed in hydrogen-air mixture and circular expanding premixed flame, demonstrating its effectiveness for reactive flows.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Mechanics
Abhimanyu Bhadauria, Benedikt Dorschner, Ilya Karlin
Summary: This paper introduces a two-way coupled fluid-structure interaction scheme for rigid bodies using a two-population lattice Boltzmann formulation for compressible flows. The model, validated with several test cases, accurately captures dynamic behavior of systems, especially in the compressible flow regime. It demonstrates the ability to accurately describe complex phenomena, such as transonic flutter over an airfoil.
Article
Mechanics
N. Sawant, B. Dorschner, I. Karlin
Summary: A new lattice Boltzmann model (LBM) is proposed for chemically reactive mixtures, which extends the non-reactive LBM to include diffusion and flow modeling for chemical species and compressible flow. The model is validated against direct numerical simulation and shows excellent accuracy and applicability for complex reactive flows.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Energy & Fuels
Mohamed Mahrous, Enzo Curti, Sergey Churakov, Nikolaos Prasianakis
Summary: This paper aims to obtain the petrophysical parameters of Indiana limestones in order to reduce uncertainties in core-scale reactive transport simulations of carbonate rocks. By combining high resolution tomography with pore scale calculations, the rock minimum representative volume, frequency distributions of petrophysical parameters, relationships between the parameters, and the spatial correlation model and lengths of the rock have been determined.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Physical
Jerry P. Owusu, Konstantinos Karalis, Nikolaos I. Prasianakis, Sergey V. Churakov
Summary: In a nuclear waste repository, gases generated from the corrosion of metals and organic degradation should be able to migrate through the multibarrier system to prevent pressure build-up. Diffusion is identified as the key mechanism for gas transport in water-saturated medium, and the diffusion coefficient is influenced by nanopore size and temperature.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Editorial Material
Environmental Sciences
Olaf Kolditz, Diederik Jacques, Francis Claret, Johan Bertrand, Sergey V. Churakov, Christophe Debayle, Daniela Diaconu, Kateryna Fuzik, David Garcia, Nico Graebling, Bernd Grambow, Erika Holt, Andres Idiart, Petter Leira, Vanessa Montoya, Ernst Niederleithinger, Markus Olin, Wilfried Pfingsten, Nikolaos I. Prasianakis, Karsten Rink, Javier Samper, Istvan Szoeke, Reka Szoeke, Louise Theodon, Jacques Wendling
Summary: Data science has become an important tool in various scientific and industrial fields, disrupting research methods. Machine learning methods have been developed to accelerate numerical simulations and applied to nuclear waste management. The challenge now is integrating multi-chemical-physical, coupled processes, multi-scale and probabilistic simulations in Digital Twins (DTw) to predict the performance of physical systems. The development of DTw concepts for geological systems in radioactive waste management is particularly challenging due to complexities and uncertainties at varying time and spatial scales.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Mechanics
S. A. Hosseini, B. Dorschner, I. V. Karlin
Summary: This paper revisits the construction of discrete kinetic models for single-component isothermal two-phase flows. The authors show the correspondence between the kinetic model for a non-ideal fluid and the Navier-Stokes equations with a non-ideal equation of state. They also introduce a scaling based on velocity increments to recover the full Navier-Stokes-Korteweg equations. The proposed model is validated on various benchmarks and exhibits thermodynamic and hydrodynamic consistency.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Biochemistry & Molecular Biology
Tobias Jaeger, Athanasios Mokos, Nikolaos I. Prasianakis, Stephan Leyer
Summary: Membrane distillation (MD) is a thermal separation process operated below boiling point. Current research focuses on improving the performance of MD modules by studying the membrane structure and underlying mechanisms. Using realistic 3D membrane geometries obtained from X-ray computed tomography, the interaction between liquid and gas phase with the porous membrane material was investigated. The influence of different microstructures on water droplets and the air-water interface within the membrane were also studied.
Review
Computer Science, Interdisciplinary Applications
S. A. Hosseini, M. Atif, S. Ansumali, I. V. Karlin
Summary: In the late 90's and early 2000's, the concept of using a discrete H theorem and Lyapunov functionals as a way to ensure stability of lattice Boltzmann solvers brought about a paradigm shift in their construction and opened up new discussions and perspectives. The entropic construction, which introduced a discrete entropy functional and enforced an H-theorem, proved to be effective in stabilizing lattice Boltzmann solvers in various applications including weakly compressible, fully compressible, and multi-phase flows. In this review, we discuss the basic building blocks of the entropic lattice Boltzmann method and its extension to multiphase and compressible flows.
COMPUTERS & FLUIDS
(2023)
Article
Materials Science, Multidisciplinary
Tobias Jager, Jemp Keup, Nikolaos I. Prasianakis, Stephan Leyer
Summary: In this paper, we study the liquid entry pressure and liquid-gas interface shape of a hydrophobic pillar-pore structure. We theoretically analyze the constant mean curvature problem and derive an analytical expression for the liquid entry pressure. We also compare our theoretical findings to multiphase lattice Boltzmann simulations and find agreement, validating our model.
Article
Computer Science, Interdisciplinary Applications
Ehsan Reyhanian, Benedikt Dorschner, Ilya Karlin
Summary: In this exploratory study, shock-capturing schemes are applied to simulate compressible flows with shock waves and discontinuities. The model is based on the semi-Lagrangian method and employs concepts like total variation diminishing and weighted essentially non-oscillatory schemes to capture the discontinuities and shock waves. The results show that the reconstruction schemes effectively remove oscillations at the shock wave location, allowing for stable simulations of compressible benchmarks. The numerical properties of the reconstruction schemes, such as spectral analysis and order of accuracy, are also discussed.
COMPUTERS & FLUIDS
(2023)
Article
Physics, Fluids & Plasmas
Meysam Khatoonabadi, Nikolaos I. Prasianakis, John Mantzaras
Summary: A lattice Boltzmann model is developed for isothermal multicomponent flows with catalytic reactions, accounting for velocity slips and concentration jumps. The model shows good agreement with computational fluid dynamics results in the continuum regime and is applicable in capturing slip velocity at high Knudsen numbers.
Article
Physics, Fluids & Plasmas
N. G. Kallikounis, B. Dorschner, I. V. Karlin
Summary: The study utilizes the particles-on-demand method to simulate compressible flows with strong discontinuities in density, pressure, and velocity. The method is modified through regularization by Grad's projection and reference frame transformations, as well as the implementation of a finite-volume scheme to improve stability, accuracy, and conservation of mass, momentum, and energy. The proposed model demonstrates excellent performance in various benchmarks, surpassing the limitations of other lattice Boltzmann-like approaches to compressible flows.
Article
Mathematics, Interdisciplinary Applications
Ehsan Reyhanian, Benedikt Dorschner, Ilya Karlin
Summary: The study presents a kinetic model for compressible non-ideal fluids that imposes local thermodynamic pressure through rescaling particle velocities for full thermodynamic consistency. The model, which is Galilean invariant, treats mass, momentum, and energy as local conservation laws. Benchmark simulations demonstrate accurate and robust performance across different scenarios, showing excellent agreement with theoretical analysis and experimental correlations. The model is capable of operating in the entire phase diagram, including super- and sub-critical regimes, and inherently captures phase-change phenomena.
