A5032735535- Lattice Boltzmann Simulation Studies
- Groundwater flow and contamination studies
- CO2 Sequestration and Geologic Interactions
- Aerosol Filtration and Electrostatic Precipitation
- Enhanced Oil Recovery Techniques
- Fluid Dynamics and Turbulent Flows
- Heat and Mass Transfer in Porous Media
- Fuel Cells and Related Materials
- Soil and Unsaturated Flow
- Hydrocarbon exploration and reservoir analysis
- Aerodynamics and Fluid Dynamics Research
- Concrete and Cement Materials Research
- Heat Transfer and Boiling Studies
- Rock Mechanics and Modeling
- Mineral Processing and Grinding
- Nuclear Materials and Properties
- Advanced Mathematical Modeling in Engineering
- Advanced Data Processing Techniques
- Nuclear Physics and Applications
- Catalytic Processes in Materials Science
- Combustion and flame dynamics
- Machine Learning in Materials Science
- Nanopore and Nanochannel Transport Studies
- Fluid Dynamics and Heat Transfer
- Fluid Dynamics and Thin Films
Paul Scherrer Institute
2014-2024
University of Bern
2024
Vifor Pharma (Switzerland)
2023
ETH Zurich
2006-2008
The exact solution to the hierarchy of nonlinear lattice Boltzmann (LB) kinetic equations in stationary planar Couette flow is found at nonvanishing Knudsen numbers. A new method solving LB which combines moments with boundary conditions for populations enables us derive closed-form solutions all higher-order moments. convergence results suggests that larger velocity sets novel way approximate theory.
Abstract This manuscript presents a benchmark problem for the simulation of single-phase flow, reactive transport, and solid geometry evolution at pore scale. The is organized in three parts that focus on specific aspects: flow transport (part I), dissolution-driven two dimensions II), an experimental validation three-dimensional III). Five codes are used to obtain solution this problem, including Chombo-Crunch, OpenFOAM-DBS, lattice Boltzman code, Vortex, dissolFoam. These cover good...
Operating Polymer Electrolyte Fuel Cells (PEFC) under high current density conditions, causes significant losses related to liquid water saturation in the gas diffusion layer (GDL). The blockage of pores inside material has a strong influence on its effective transport properties. Here we report combination in-situ X-ray tomographic microscopy (XTM) PEFC and numerical determination properties using Lattice Boltzmann finite difference methods. GDL domains (Toray TGP-H-060) two identical...
The recently introduced consistent lattice Boltzmann model with energy conservation [S. Ansumali and I. V. Karlin, Phys. Rev. Lett. 95, 260605 (2005)] is extended to the simulation of thermal flows on standard lattices. two-dimensional square nine velocities developed validated in Couette Rayleigh-B\'enard natural convection problems.
Abstract Mineral precipitation and dissolution in aqueous solutions has a significant effect on solute transport structural properties of porous media. The understanding the involved physical mechanisms, which cover large range spatial temporal scales, plays key role several geochemical industrial processes. Here, by coupling pore scale reactive simulations with classical nucleation theory, we demonstrate how interplay between homogeneous heterogeneous kinetics along non-linear dependence...
Abstract Data science (digitalisation and artificial intelligence) became more than an important facilitator for many domains in fundamental applied sciences as well industry is disrupting the way of research already to a large extent. Originally, data were viewed be well-suited, especially, data-intensive applications such image processing, pattern recognition, etc. In recent past, particularly, data-driven physics-inspired machine learning methods have been developed extent that they...
In this study, we employ a three-dimensional (3D) non-orthogonal multiple relaxation time (MRT) pseudo-potential lattice Boltzmann (LB) model to simulate the dynamics of cavitation bubble evolution. We benchmark against Laplace law and Rayleigh–Plesset (R–P) equation, confirming its efficacy in accurately capturing phenomena. then apply examine collapse singular located near plane wall boundary right-angled corner. Additionally, dynamic interactions among five cross-shaped bubbles revealed...
This study centers on the critical aspect of thermal management in deep geological repositories, particularly concerning heat induced by radioactive nuclear waste. It evaluates eight machine learning methods to analyze thermal-hydraulic processes, focusing their accuracy predicting temperature and relative humidity, computational efficiency, robustness, sensitivity parameters. These are applied data from Full-scale Emplacement experiment Mont Terri underground laboratory. Notably,...
Abstract An accurate mechanistic understanding of solute diffusion in partially saturated clays is critical for assessing the safety deep geological repositories radioactive waste. In this study, a pore‐scale numerical framework developed to simulate water and ion clays. First, two‐phase Shan‐Chen Lattice Boltzmann method employed establish liquid‐gas distribution reconstructed three‐dimensional pore geometry clay. equivalent also validated improve stability solution at liquid/gas interface...
Microfabrication techniques allow the development and production of artificial superhydrophobic surfaces that possess a precisely controlled roughness at micrometer level, typically achieved through arrangement micropillar structures in periodic patterns. In this work, we analyze stability energy barrier droplets Cassie-Baxter (CB) state on such addition, further develop transition criterion using CB equation derive an improved version which allows predicting for pillar geometries,...
Membrane distillation (MD) is a thermally driven separation process that operated below boiling point. Since the performance of MD modules still comparatively low, current research aims to improve understanding membrane structure and its underlying mechanisms at pore level. Based on existing realistic 3D geometries (up 0.5 billion voxels with 39nm resolution) obtained from ptychographic X-ray computed tomography, D3Q27 lattice Boltzmann (LB) method was used investigate interaction liquid...
The recently introduced lattice Boltzmann model for thermal flow simulation on a standard [Prasianakis and Karlin, Phys. Rev. E 76, 016702 (2007)] is studied numerically in the case where compressibility effects are essential. It demonstrated that speed of sound shock propagation described correctly wide temperature range, it possible to take into account additional physics such as heat sources sinks. A remarkable simplicity makes viable engineering applications subsonic flows with large...
Abstract Deep subsurface exploration is important for mining, oil and gas industries, as well in the assessment of geological units disposal chemical or nuclear waste, viability geothermal energy systems. Typically, detailed examinations formations are performed on cuttings core materials extracted during drilling campaigns, geophysical borehole data, which provide information about petrophysical properties rocks. Depending volume rock samples analytical program, laboratory analysis...
Components of the so-called “multiple-barrier system” from waste form to biosphere include a combination containers, engineered barriers, and natural barriers. The Engineered Barrier System (EBS) is crucial for containment isolation in radioactive disposal system. number, types, assigned safety functions various barriers depend on chosen repository concept, form, radionuclides inventory, selected host rock, hydrogeological geochemical settings site, among others. EBS properties will evolve...
The understanding and prediction of mineral precipitation processes in porous media are relevant for various energy-related subsurface applications. While it is well known that thermodynamic effects can inhibit crystallization pores with sizes <0.1 µm, the retarded observation as function pore size less explored. Using barite an example based on a series microfluidic experiments well-defined shapes, we show retardation crystallite already start 1 µm size, probability nucleation scaling...
The Strategic Research Agenda (SRA; https://www.ejp-eurad.eu/publications/eurad-sra ) of the European Joint Programme on Radioactive Waste Management (EURAD; https://www.ejp-eurad.eu/ describes scientific and technical domains sub-domains knowledge management needs common interest between EURAD participant organizations. Theme number 7 is entitled “Performance assessment, safety case development analyses.” A list research priorities activities to be addressed within for theme have been...
An isothermal model on the standard two-dimension nine-velocity lattice (D2Q9) is proposed and analyzed. It originates from thermal with energy conservation introduced by N. I. Prasianakis V. Karlin [Phys. Rev. E 76, 016702 (2007)]. The equivalent models are tested through simulation of decay a shear wave temperature wave. Both shown to be Galilean invariant, reference independent, rotational isotropic measurement transport coefficients rotated moving frame reference.
Catalytic reactions are of great interest in many applications related to power generation, fuel reforming and pollutant abatement, as well various biochemical processes. A recently proposed lattice Boltzmann model for thermal binary-mixture gas flows [J. Kang, N. I. Prasianakis, J. Mantzaras, Phys. Rev. E. 87, 053304 (2013)] is revisited extended the simulation multispecies with catalytic reactions. The resulting can handle large temperature concentration gradients. developed presented...