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Towards a parameter-free method for high Reynolds number turbulent flow simulation based on adaptive finite element approximation

Johan Hoffman, Johan Jansson, Niclas Jansson, Rodrigo Vilela De Abreu
2015 Computer Methods in Applied Mechanics and Engineering  
We present work towards a parameter-free method for turbulent flow simulation based on adaptive finite element approximation of the Navier-Stokes equations at high Reynolds numbers.  ...  problems for which the method is validated.  ...  from 2 contributions based on Lattice Boltzmann Methods all other contributions used stationary RANS. 410 Good agreement of DFS simulations and experimental data was found in aerodynamic forces and  ... 
doi:10.1016/j.cma.2014.12.004 fatcat:5bwwjnm2abbmffxvmof5qiu7e4

Numerical analysis of a 3-D printed porous trailing edge for broadband noise reduction

C. Teruna, F. Avallone, D. Ragni, A. Rubio-Carpio, D. Casalino
2021 Journal of Fluid Mechanics  
Lattice Boltzmann simulations were carried out to investigate the noise mitigation mechanisms of a 3-D printed porous trailing-edge insert, elucidating the link between noise reduction and material permeability  ...  The porous insert is based on a unit cell resembling a lattice of diamond atoms. It replaces the last 20 % chord of a NACA 0018 at zero angle-of-attack.  ...  The authors would like to acknowledge the technical support of Dr W. van der Velden from Dassault Systèmes for the PowerFLOW template for the aerofoil trailing-edge noise study.  ... 
doi:10.1017/jfm.2021.704 fatcat:nj3bq5xvhfdgzashygypxkqrm4

CEAS-ASC highlights 2006

Stéphane Caro
2007 Journal of Sound and Vibration  
Quantitative evaluation of the lattice boltzmann method for use in aeroacoustics ARTICLE IN PRESS The Lattice Boltzmann method (LBM) is studied regarding applications in aeroacoustics.  ...  The EC-funded TILTAERO project's configuration has been simulated by using a BEM code for the aerodynamic field, coupled with a GFD code for the acoustic propagation.  ... 
doi:10.1016/j.jsv.2007.03.029 fatcat:bjm4s577frdsbecnlnamj7aw5m

Improved color-gradient method for lattice Boltzmann modeling of two-phase flows

Pierre Boivin T. Lafarge
2021 Zenodo  
This article presents a revised formulation of the color gradient method to model immiscible two-phase flows in the Lattice-Boltzmann framework.  ...  Thanks to this formulation, the Colour-Gradient method is generalised to an arbitrary Equation of State under the form p = f(ρ, φ), relieving the non-physical limitation between density and sound speed  ...  Léa Voivenel and Stefano Puggeli from Safran Tech are also acknowledged for project coordination.  ... 
doi:10.5281/zenodo.6450231 fatcat:lvi3i7lfvzbmnoy5qw5mzqnkli

Comparison of the solutions of the elastic and elastoplastic boundary value problems

Holger Lang, Klaus Dressler, René Pinnau, Michael Speckert
2009 Zeitschrift für Angewandte Mathematik und Physik  
Further, we give an explicit example of a homotopy between the solutions of both problems.  ...  We derive expressions and estimates for the difference of the solutions of both models, i.e. for the stresses, the strains and the displacements.  ...  Thanks to the Deutsche Forschungsgemeinschaft, the Graduiertenkolleg Mathematik und Praxis (TU Kaiserslautern) for the financial support, the Fraunhofer Gesellschaft for technical support, professors Martin  ... 
doi:10.1007/s00033-009-0042-y fatcat:z7y3ihyzzzasdd4geqqyqwdwvi

Social groups in pedestrian crowds: Review of their influence on the dynamics and their modelling [article]

Alexandre Nicolas, Fadratul Hafinaz
2021 arXiv   pre-print
After turning a blind eye to these group aspects for years, endeavours to model groups in crowd simulation software have thrived in the past decades.  ...  Then, it aims to offer a pedagogical discussion of the main strategies to model such groups, within different types of models, in order to provide guidance for prospective modellers.  ...  A celebrated example is the recourse to a lattice-Boltzmann method to solve the Navier-Stokes equation, the main equation of fluid dynamics: Instead of solving the partial differential equations of the  ... 
arXiv:2107.13293v1 fatcat:gjyipfzw5bg6joxxhj77z7txim

Large eddy simulation of inertial fiber deposition mechanisms in a vertical downward turbulent channel flow

Derrick O. Njobuenwu, Michael Fairweather
2017 AIChE Journal  
The deposition pattern of elongated inertial fibres in a vertical downward turbulent channel flow is predicted using large eddy simulation and Lagrangian particle tracking.  ...  This study describes how particles deposit on a surface and, ultimately for many practical applications, how such deposition may promote fouling.  ...  Modelling for Advanced Nuclear Power Plants".  ... 
doi:10.1002/aic.15664 fatcat:u5yjjisdkjcenflkcgzdxbwcmq

Restricted Snakes Volume of Solid (RSVS): A Parameterisation Method for Topology Optimisation of External Aerodynamics

A.D.J. Payot, T.C.S. Rendall, C.B. Allen
2019 Computers & Fluids  
The method is extended to allow for anisotropic refinement of the parameter mesh.  ...  Full terms of use are available: a b s t r a c t An approach for aerodynamic shape optimisation is derived which is capable of handling topological design changes as well as detailed surface control.  ...  Lattice-Boltzmann methods have been used to tackle some very low Reynolds number problems [27, 28] .  ... 
doi:10.1016/j.compfluid.2019.02.008 fatcat:hiuvc4lgczfhbb7kl4iihd2wlq

Aircraft noise prediction

Antonio Filippone
2014 Progress in Aerospace Sciences  
This contribution addresses the state-of-the-art in the field of aircraft noise prediction, simulation and minimisation.  ...  It is contended that the field of aircraft noise prediction has yet not reached a sufficient level of maturity.  ...  The aerodynamics is based on an generalised blade element method with transonic corrections.  ... 
doi:10.1016/j.paerosci.2014.02.001 fatcat:oyplfvnhonez5dyiugf7hrg3sm

On the drag and lift coefficients of ellipsoidal particles under rarefied flow conditions [article]

Cosimo Livi, Gianluca Di Staso, Herman H. J. Clercx, Federico Toschi
2021 arXiv   pre-print
The functional forms for the correlations for the ellipsoidal particles are chosen as a generalisation from the spherical case.  ...  The capability to simulate a two-way coupled interaction between a rarefied gas and an arbitrary-shaped colloidal particle is important for many practical applications, such as aerospace engineering, lung  ...  [13, 14] performed accurate simulations using the Lattice-Boltzmann method, extending available correlations for the drag, lift and torque coefficients for particles with different shapes, including  ... 
arXiv:2108.02098v1 fatcat:2r5fknjsrnedja7ngneipvqsey

D8.1.4: Plan for Community Code Refactoring

Claudio Gheller, Will Sawyer
2012 Zenodo  
A detailed description of the proposed work and its motivations are reported, for most cases motivated through a performance modelling analysis.  ...  A detailed workplan for the implementation phase (M7-20) is presented for each application, specifying the timeline and the milestones for its refactoring, and clearly stating the main objectives of the  ...  It is written in Fortran90, C and python and relies on MPI for parallel simulations.  ... 
doi:10.5281/zenodo.6572340 fatcat:mobdwam6kzgzvf2th46k7b66k4

A computational study of turbulent flow separation for a circular cylinder using skin friction boundary conditions [chapter]

Johan Hoffman, Niclas Jansson
2011 ERCOFTAC Series  
The BE poses a formidable challenge for numerical approximation methods, on account of its high dimensional phase-space setting: for a problem in N spatial dimensions, the single molecule phase-space is  ...  A priori estimates are applied to the anisotropic mesh adaptation for 2D viscous flows and 3D ones including Large Eddy Simulation.  ...  networks towards application at hospital".  ... 
doi:10.1007/978-94-007-0231-8_5 fatcat:f6ll6iawcbeo7pbj4rb7t4o2tq

The Effect of a Micro-Perforated Cavity Floor on the Propagation of Tunnel-Cavity Modes in a Low-Speed Duct Flow

Cédric Maury, Teresa Bravo, Daniel Mazzoni
2020
First, wall-pressure measurements and 2D LBM (Lattice-Boltzmann Method) simulations confirmed the potential of micro-perforated cavity floors to attenuate the transverse cut-on TC modes that are cut-off  ...  and that undergoes a low-speed flow regime at Mach 0.09.  ...  SIMULATIONS A numerical model based on the 2D Lattice Boltzmann Method (LBM) [15,16,17] has been built to predict the effect on the TC resonances of microperforating the floor of a cavity in transitional  ... 
doi:10.48465/fa.2020.0035 fatcat:reqvexltmrghhautlxwmwdqvbe

Advanced Numerical Methods and Software Approaches for Semiconductor Device Simulation

Graham F. Carey, A. L. Pardhanani, S. W. Bova
2000 VLSI design (Print)  
Some of the methods have been applied to the semiconductor device problem while others are still in the early stages of development for this class of applications.  ...  A second aspect of the work deals with algorithms that employ unstructured grids in conjunction with adaptive refinement strategies.  ...  x 10-31 kg, (5 = permittivity of silicon = 11.9 co, Co = 8.854 x 10-12 C2/(joule m), KB = Boltzmann constant = 1.381 x 10-23 joule/kelvin, wo =~~BTL joule, TL = lattice temperature in kelvin, and a =  ... 
doi:10.1155/2000/43903 fatcat:frsmpdzrhjh3tlkdre36njbrbi

D8.2: Refactoring and Algorithm Re-engineering Guides and Reports

Claudio Gheller
2013 Zenodo  
In the work package a number of applications, designed to perform large-scale numerical simulations in various scientific areas, namely Astrophysics, Material Science, Climate, Particle Physics and Engineering  ...  Finally, an outlook toward the next (and final) steps of the work package, is given, summarising the remaining activities.  ...  These software suites provide functionality for performing lattice QCD simulations as well as lattice calculations of physical observables.  ... 
doi:10.5281/zenodo.6572387 fatcat:kpgvqclewbcuvnn25rrpd7wih4
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