102 Hits in 5.0 sec

Optimizing free parameters in the D3Q19 Multiple-Relaxation lattice Boltzmann methods to simulate under-resolved turbulent flows

Miguel Chavez, Alejandro Martinez Cava, Gonzalo Rubio, Esteban Ferrer
2020 Zenodo  
We present a D3Q19 lattice scheme based in MRT with central moments (MRTCM), where the free parameters of the model are optimized to dissipate high wavenumber under-resolved flow structures.  ...  These results suggest that our optimization strategy enhances stability and allows for accurate energy spectra in under-resolved flows simulations such as typically found in Large Eddy Simulations.  ...  Acknowledgment This project has received funding from the European Unionś Horizon 2020 The authors acknowledge the computer resources and technical assistance provided by the Centro de Supercomputación  ... 
doi:10.5281/zenodo.3749883 fatcat:hfgs6dbwqrgvzeaakazggbyknu

Turbulent jet computations based on MRT and Cascaded Lattice Boltzmann models [article]

S. Geller, S. Uphoff, M. Krafczyk
2012 arXiv   pre-print
In this contribution a numerical study of a turbulent jet flow is presented. The simulation results of two different variants of the Lattice Boltzmann method (LBM) are compared.  ...  The second is the D3Q27 Factorized Cascaded Lattice Boltzmann (FCLB) model without any additional explicit turbulence model.  ...  In addition, Sonja Uphoff acknowledges financial support from German research foundation (DFG) from the collaborative research project SFB 880.  ... 
arXiv:1206.0389v1 fatcat:45ovntobcnfrvgijdqnhwvhrxi

Lattice Boltzmann large eddy simulation of subcritical flows around a sphere on non-uniform grids

M. Stiebler, M. Krafczyk, S. Freudiger, M. Geier
2011 Computers and Mathematics with Applications  
In this work, the suitability of the lattice Boltzmann method is evaluated for the simulation of subcritical turbulent flows around a sphere.  ...  A large eddy simulation turbulence model is employed to allow efficient simulation of resolved flow structures on non-uniform computational meshes.  ...  The optimal filter would eliminate only high frequencies in the flow field while their influence on the large eddies, which are resolved in the simulation, is modeled.  ... 
doi:10.1016/j.camwa.2011.03.063 fatcat:t55ygrtbpvbtbgmkfful2smr4y

Lettuce: PyTorch-based Lattice Boltzmann Framework [article]

Mario Christopher Bedrunka, Dominik Wilde, Martin Kliemank, Dirk Reith, Holger Foysi, Andreas Krämer
2021 arXiv   pre-print
The lattice Boltzmann method (LBM) is an efficient simulation technique for computational fluid mechanics and beyond.  ...  We also exemplify the added benefit of PyTorch's automatic differentiation framework in flow control and optimization.  ...  [33] have applied deep learning methods to the lattice Boltzmann method to predict the sound pressure level caused by objects.  ... 
arXiv:2106.12929v1 fatcat:cdtuxtrxfzdkznqi7aqei475vm

Generalized lattice Boltzmann equation with forcing term for computation of wall-bounded turbulent flows

Kannan N. Premnath, Martin J. Pattison, Sanjoy Banerjee
2009 Physical Review E  
We present a framework based on the generalized lattice-Boltzmann equation using multiple relaxation times with forcing term for eddy capturing simulation of wall bounded turbulent flows.  ...  Due to its flexibility in using disparate relaxation times, the GLBE is well suited to maintaining numerical stability on coarser grids and in obtaining improved solution fidelity of near-wall turbulent  ...  A more general form of the LBE, sometimes also called the moment method or the generalized lattice Boltzmann equation (GLBE) , is based on the use of multiple relaxation times (MRT) to represent collision  ... 
doi:10.1103/physreve.79.026703 pmid:19391870 fatcat:32dfcgg2mzgrtotihvjcje43ha

Simulation of stratified flows over a ridge using a lattice Boltzmann model

Yansen Wang, Benjamin T. MacCall, Christopher M. Hocut, Xiping Zeng, Harindra J. S. Fernando
2018 Environmental Fluid Mechanics  
A three-dimensional thermal lattice Boltzmann model (TLBM) using multirelaxation time method was used to simulate stratified atmospheric flows over a ridge.  ...  The main objective was to study the efficacy of this method for turbulent flows in the atmospheric boundary layer, complex terrain flows in particular.  ...  Introduction The Lattice Boltzmann method (LBM) has been developed in recent years as an effective computational fluid dynamics (CFD) tool for fluid flow modeling.  ... 
doi:10.1007/s10652-018-9599-3 fatcat:5wasdevntbcufainbxeozh4mui

Actuator line simulations of wind turbine wakes using the lattice Boltzmann method

Henrik Asmuth, Hugo Olivares-Espinosa, Stefan Ivanell
2020 Wind Energy Science  
The presented work investigates the potential of LES of wind turbine wakes using the cumulant lattice Boltzmann method (CLBM). The wind turbine is represented by the actuator line model (ALM).  ...  The high computational demand of large-eddy simulations (LESs) remains the biggest obstacle for a wider applicability of the method in the field of wind energy.  ...  .: Actuator line simulations of wind turbine wakes using the lattice Boltzmann method mostly relate to the class of multiple-relaxation-time (MRT) models; see for instance Lallemand and Luo (2000) and  ... 
doi:10.5194/wes-5-623-2020 fatcat:yxp7gguhovaldn27m7klvfcewi

Free surface flow simulations on GPGPUs using the LBM

Christian Janßen, Manfred Krafczyk
2011 Computers and Mathematics with Applications  
For the solution of the flow field and the additional advection equation for the VOF fill level, the lattice Boltzmann method on the basis of an MRT collision operator is used.  ...  A Smagorinsky LES model serves to capture the small-scale turbulent structures of the flow.  ...  The lattice Boltzmann method The lattice Boltzmann method (LBM) has become an efficient approach for solving a variety of difficult CFD problems, including those in the field of multiphysics.  ... 
doi:10.1016/j.camwa.2011.03.016 fatcat:ra5oei6zynbvnnhvwfi43jvb4u

Lattice Boltzmann Method Applied to Nuclear Reactors—A Systematic Literature Review

Johan Augusto Bocanegra Cifuentes, Davide Borelli, Antonio Cammi, Guglielmo Lomonaco, Mario Misale
2020 Sustainability  
The purpose of this paper is to present a review of the recent applications of the Lattice Boltzmann Method in nuclear engineering research.  ...  The Lattice Boltzmann Method (LBM), a numerical method with a mesoscopic approach to Computational Fluid Dynamic (CFD) derived from the Boltzmann equation and the Maxwell–Boltzmann distribution, can be  ...  Park, in 2015 [51] , presented the simulation of flow on rod bundles in turbulent regime (2D geometry, using primitive cells and periodic boundary conditions) applying a Multiple Relaxation time (MRT)  ... 
doi:10.3390/su12187835 fatcat:g5gmapffuzd5pig3sgrsazkqiq

Dynamic subgrid scale modeling of turbulent flows using lattice-Boltzmann method

Kannan N. Premnath, Martin J. Pattison, Sanjoy Banerjee
2009 Physica A: Statistical Mechanics and its Applications  
In this paper, we discuss the incorporation of dynamic subgrid scale (SGS) models in the lattice-Boltzmann method (LBM) for large-eddy simulation (LES) of turbulent flows.  ...  We employ the multiple relaxation times (MRT) formulation of LBM with a forcing term for simulation of the grid-filtered dynamics of large-eddies.  ...  In this paper, we propose to incorporate dynamic procedure in the lattice Boltzmann method (LBM) for LES.  ... 
doi:10.1016/j.physa.2009.02.041 fatcat:wvaboccfojan7d2zdldv6joeoi

Overview of the lattice Boltzmann method for nano- and microscale fluid dynamics in materials science and engineering

D Raabe
2004 Modelling and Simulation in Materials Science and Engineering  
The article gives an overview of the lattice Boltzmann method as a powerful technique for the simulation of single and multi-phase flows in complex geometries.  ...  The lattice Boltzmann method, therefore, is an ideal approach for mesoscale and scale-bridging simulations.  ...  Related fields where the lattice Boltzmann method has reached the necessary maturity as a simulation tool for optimizing production processes is the modelling of flows in complex and time-dependent geometries  ... 
doi:10.1088/0965-0393/12/6/r01 fatcat:m6uafoqyqzezzdhllcjb6xz4zu

lbmpy: Automatic code generation for efficient parallel lattice Boltzmann methods [article]

Martin Bauer, Harald Köstler, Ulrich Rüde
2020 arXiv   pre-print
Many variants have been developed that vary in complexity, accuracy, and computational cost. Extensions are available to simulate multi-phase, multi-component, turbulent, or non-Newtonian flows.  ...  Transformations that operate on this intermediate representation optimize and parallelize the method, yielding highly efficient lattice Boltzmann compute kernels not only for single- and two-relaxation-time  ...  Additionally we are grateful to the Regionales Rechenzentrum Erlangen, the Leibniz-Rechenzentrum in Garching and the Swiss National Supercomputing Centre in Lugano for providing compute time on their HPC  ... 
arXiv:2001.11806v2 fatcat:k6ttxc2mvbczdbypw244gpcfay

Lattice Boltzmann simulation of particle-laden turbulent channel flow

Lian-Ping Wang, Cheng Peng, Zhaoli Guo, Zhaosheng Yu
2016 Computers & Fluids  
We discuss how the mesoscopic lattice Boltzmann method (LBM) can be applied to treat both the turbulent carrier flow and moving fluid-particle interfaces.  ...  We also found that the statistics of the fully-developed turbulent channel flow are independent of the setting of some of the relaxation parameters in the LBM approach.  ...  Acknowledgements This work has been supported by the U.S.  ... 
doi:10.1016/j.compfluid.2015.07.008 fatcat:ayj35dyzivhwrc3blx2nt3f5aa

Theoretical and numerical analysis of the lattice kinetic scheme for complex-flow simulations

S. A. Hosseini, N. Darabiha, D. Thévenin
2019 Physical review. E  
The lattice kinetic scheme (LKS) is a modified version of the classical single relaxation time lattice Boltzmann method.  ...  It is shown that it is more stable than SRT (single relaxation time) when confronted to fully periodic under-resolved simulations (especially for λ ≈ 1).  ...  Methods based on the application of relaxation in momentum space have been shown to be an efficient remedy to the previously mentioned issue and instabilities for under-resolved simulations -for non-dimensional  ... 
doi:10.1103/physreve.99.023305 fatcat:fri3mz6isvamjmkduz7ajsix5y

Optimal control for integrated emission management in diesel engines

M.C.F. Donkers, J. Van Schijndel, W.P.M.H. Heemels, F.P.T. Willems
2017 Control Engineering Practice  
Here we will present results on the development of numerical algorithms, based on the lattice Boltzmann method, suitable for the study of suspensions of finite-size particles under turbulent flow conditions  ...  The turbulent flow is modeled by the lattice Boltzmann method, and the interaction between particles and carrier fluid is modeled using the bounce-back rule.  ...  This work was carried out on the Dutch national e-infrastructure with the support of SURF Cooperative.  ... 
doi:10.1016/j.conengprac.2016.03.006 fatcat:fh7i7bed6rgjln3ciumkgizwlm
« Previous Showing results 1 — 15 out of 102 results