A5070815671- Lattice Boltzmann Simulation Studies
- Aerosol Filtration and Electrostatic Precipitation
- Generative Adversarial Networks and Image Synthesis
- Fluid Dynamics and Vibration Analysis
- Heat and Mass Transfer in Porous Media
- Distributed and Parallel Computing Systems
- Simulation Techniques and Applications
- Aerodynamics and Acoustics in Jet Flows
- Fluid Dynamics and Turbulent Flows
- Advanced Control Systems Optimization
- Advanced Data Storage Technologies
- Groundwater flow and contamination studies
- Aerodynamics and Fluid Dynamics Research
- Machine Learning and ELM
- Computer Graphics and Visualization Techniques
- Traffic Prediction and Management Techniques
- Model Reduction and Neural Networks
- Gas Dynamics and Kinetic Theory
- Advanced Multi-Objective Optimization Algorithms
- Air Quality Monitoring and Forecasting
- Granular flow and fluidized beds
- Parallel Computing and Optimization Techniques
- Fault Detection and Control Systems
Karlsruhe Institute of Technology
2020-2025
We present the OpenLB package, a C++ library providing flexible framework for lattice Boltzmann simulations. The code is publicly available and published under GNU GPLv2, which allows adaption implementation of additional models. extensibility benefits from modular structure achieved e.g. by utilizing template meta-programming. package covers various methodical approaches applicable to wide range transport problems (e.g. fluid, particulate thermal flows). built-in processing STL file format...
OpenLB is a generic implementation of lattice Boltzmann methods (LBM) that shared with the open source community under terms GPLv2 license. Since first release in 2007, code continues to be improved and extended, resulting fifteen releases counting. The framework written C++ covers full scope simulations – from pre-processing over parallel efficient execution post-processing results. It offers both possibility setting up new simulation cases using existing rich collection models implementing...
Summary Lattice Boltzmann methods (LBM) are well suited to highly parallel computational fluid dynamics simulations due their separability into a perfectly collision step and propagation that only communicates within local neighborhood. The implementation of the provides constraints for maximum possible bandwidth‐limited performance, memory layout usage vector instructions. This article revisits extends work on implicit directly addressed grids started by A‐A its shift‐swap‐streaming (SSS)...
A promising approach to quantify reaction rate parameters is formulate and solve inverse problems by minimizing the deviation between simulation measurement. One major challenge may become non-uniqueness of recovered due ill-posed problem formulation, which requires sophisticated approaches such as regularization. This study investigates feasibility using spatially distributed reference data, i.e., concentration distributions reactive flows, could be obtained magnetic resonance imaging...
Lattice Boltzmann Methods (LBM) are particularly suited to highly parallel computational fluid dynamics simulations both on SIMD CPUs and GPUs. While heterogeneous systems combining GPUs ubiquitous in high performance computation (HPC), the computationally dominant collide-and-stream loop commonly only utilizes either or homogeneously. This article proposes a novel approach utilizing genetic programming for cost-aware optimization of spatial domain decompositions targeting execution...
The present state of research in Computational Fluid Dynamics (CFD) is marked by an ongoing process refining numerical methods and algorithms with the goal achieving accurate modeling analysis fluid flow heat transfer phenomena. Remarkable progress has been achieved domains turbulence modeling, parallel computing, mesh generation, resulting heightened simulation precision when it comes to capturing complex behaviors. Nevertheless CFD faces a significant challenge due time expertise needed...
Micromixers are chemical processing devices with complex flow patterns applied for both mixing and reaction of species. In current research, laminar reacting multicomponent flows considered. Despite the streaming regime (e.g., Re = 186), there exist secondary microstructures. For this setup, accurate predictions those structures possible a large-eddy simulation on fine mesh resolving till Batchelor microscales. Utilizing open-source lattice Boltzmann method (LBM) framework, OpenLB, benchmark...
Numerical calculations of low-Reynolds-number freejets with a Lattice Boltzmann Method are presented. The calculated-time-averaged axial velocity round jet [Formula: see text] matches experimental data, including the length transition from laminar to turbulent flow. Special care was needed for inlet conditions in order reproduce vena contracta phenomenon. results jets show good agreement Finite Difference literature. In principle, there is strong sensitivity conditions, suggesting need...
Abstract An Euler–Lagrange multicomponent, non-Newtonian Lattice-Boltzmann method is applied for the first time to model a full-scale gas-mixed anaerobic digester wastewater treatment. Rheology modelled through power-law and, in digestion modelling, turbulence Smagorinsky Large Eddy Simulation model. The hydrodynamics of studied by analysing flow and viscosity patterns, assessing degree mixing Uniformity Index method. Results show independence from grid size number Lagrangian substeps...
The present state of research in computational fluid dynamics (CFD) is marked by an ongoing process refining numerical methods and algorithms with the goal achieving accurate modeling analysis flow heat transfer phenomena. Remarkable progress has been achieved domains turbulence modeling, parallel computing, mesh generation, resulting heightened simulation precision when it comes to capturing complex behaviors. Nevertheless, CFD faces a significant challenge due time expertise needed for...
We derive a novel lattice Boltzmann scheme, which uses pressure correction forcing term for approximating the volume averaged Navier-Stokes equations (VANSE) in up to three dimensions. With new definition of zeroth moment Lattice equation, spatially and temporally varying local fractions are taken into account. A Chapman-Enskog analysis, respecting variations volume, formally proves consistency towards VANSE limit higher order terms. The numerical validation scheme via steady state...
Micro-electromechanical systems (MEMS) are very small devices that usually contain gas under low pressure. The motion of the fluid inside such structures is affected by rarefaction effects, which not visible in macroscale flows. To accurately predict behavior microstructures, Lattice Boltzmann Method needs to be modified account for these new effects. This can done introducing relative fluid-wall velocity form slip boundary conditions. Furthermore, temperature effects like jump and thermal...
OpenLB is an object-oriented implementation of LBM. It the first a generic platform for LBM programming, which shared with open source community (GPLv2). Since release in 2007, code has been continuously improved and extended documented by thirteen releases as well corresponding notes are available on website (https://www.openlb.net). The written C++ used application programmers developers, ability to implement custom models supports complex data structures that allow simulations geometries...
Micromixers are widely used chemical processing devices that applied for both mixing and reacting flows. In current research, the laminar multi-component flows considered [1, 2, 3]. Despite streaming regime (e.g. Re = 186), there exist flow micro-structures. For this setup, accurate predictions of structures possible with a direct numerical simulation on fine mesh resolving Batchelor microscales.Utilizing open-source Lattice Boltzmann Methods (LBM) framework OpenLB (www.openlb.net, [4, 5])...
A promising approach to quantify reaction rate parameters is formulate and solve inverse problems by minimizing the deviation between simulation measurement. One major challenge may become non-uniqueness of recovered due ill-posed problem formulation, which requires sophisticated approaches such as regularization. This study investigates feasibility using spatially distributed reference data, i.e., concentration distributions reactive flows, could be obtained magnetic resonance imaging...