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Author: Tim Pertzel

OpenLB Overview Paper Published

We are very happy to announce that we have just published our new OpenLB Overview Paper. You can find it on pages 258-288 in volume 81 of Computers & Mathematics with Applications. This paper summarizes the findings of the research that was conducted with OpenLB and gives a brief introduction to the underlying concepts as well as the design of the parallel data structure. It is a great read for newcomers as well as seasoned OpenLB users.

The paper can be viewed and downloaded here: http://www.sciencedirect.com/science/article/pii/S0898122120301875 

OpenLB release 1.4 available for download

The developer team is very happy to announce the release of the next version of OpenLB. The updated open-source Lattice Boltzmann (LB) code is now available for download. 

The changes and new features are:

  • Enhanced user experience for interfaces: 
    • Complete overhaul of the core data structure (population and field data) 
    • Improved boundary handling (better interface and easier extension possibilities)  
    • Overhaul of HLBM, now with updated momentum exchange algorithm and Kupershtokh forcing 
  • Additional multiphysics models: 
    • New mixed scale diffusivity turbulence model in 2D and 3D 
    • New phase field-based multi component model in 2D and 3D 
    • New total enthalpy-based melting and solification model in 2D and 3D 
  • Performance improvements in some workloads: 
    • New propagation pattern
    • Communication improvements via reworked coupling routines using dynamic fields 
    • Average speed up of about 28% for the example cases 
  • New examples: 
    • turbulence/channel3d
    • thermal/stefanMelting2d
    • thermal/galliumMelting2d
    • thermal/advectionDiffusion1d
    • thermal/advectionDiffusion2d 
  • Minor improvements and developer notes:
    • revision of example laminar/bstep2d
    • all fields declared in the descriptor are now included in simulation snapshots
    • fields may now use types different than the lattice’s floating point type
    • new _dynamic fields_ allow using the field interface also for fields that are declared at runtime
    • Knudsen number and refinement quality functors are now available in both 2D and 3D
  • Compatibility tested on:
    • OSX: 
      • macOS 10.13.6: Clang 10 (1000.10.44.4)
    • Linux: 
      • Intel 18, 19, 19.1
      • GCC 7.5, 8.2.1, 9.3, 10.2
      • Clang 7
    • Windows 10: 
      • Debian WSL: GCC 7.5, 8.2.1, 9.3

Intel MPI 2019 Update 5, OpenMPI 2.1.1 and higher

PS: Please consider joining the developer team by contributing your code. Together we can strengthen the LB community by sharing our research in an open and reproducible way! Feel free to contact us here.

OpenLB Community YouTube Channel Update

We have released two new Videos on our OpenLB YouTube Channel. The first Video is about a 3D simulation of blood flowing through the human aorta. The second one visualizes phase separation in 3D.

For further information please visit the corresponding show case:

Data and Simulation: Mathias J. Krause 

Visualisation: Max Mutter, Jan Marquardt, Mathilde Wu

Data and Simulation: Peter Weisbrod, Mathias J. Krause 

Visualisation: Fabian Kösegi, Jan Marquardt, Mathilde Wu

OpenLB paves the way to “overnight” near-wall-modeled large eddy simulations

In a collaboration of the Lattice Boltzmann Research Group (LBRG) at the Karlsruhe Institute of Technology (KIT) and the Institute of Reactive Flows and Diagnostics of the department of Mechanical Engineering at the Technical University of Darmstadt, the capabilities of two open source near-wall-modeled large eddy simulation (NWM-LES) approaches were investigated to predict complex turbulent flows relevant to internal combustion (IC) engines.

Therefore, OpenLB was compared to the commonly applied open source tool OpenFOAM, using a highly precise particle image velocimetry measurement as reference. The comparison covers prediction accuracy, computational costs and ease of use.

The performance results show that the OpenLB approach is on average 32 times faster than the OpenFOAM implementation for the tested configurations. The faster calculation speed for NWM-LES using the lattice Boltzmann method implementation in OpenLB is advantageous to address industrial applications and to enable “overnight” calculations that previously took weeks.

Checkout our recent publication for more details: https://www.mdpi.com/2079-3197/8/2/43

Spring School 2020 successfully finished

2020/03/13 | LBM Spring School with OpenLB Software Lab successfully finished. The executive committee announces the closing of the third LBM Spring School with OpenLB Software Lab. We were happy to host 60 participants from nine countries, including five invited speakers in Berlin, Germany. This year’s poster award goes to Dominik Wilde et al. from the University of Siegen, Germany.

Next year, the 5th spring school (https://www.openlb.net/spring-school-2021/) in planned to take place at the University of Greenwich in England/UK form 2021 May 31st to June 4th.  

On behalf of the spring school executive committee, Nicolas Hafen, Mathias J. Krause, Harald Kruggel-Emden, Christopher McHardy, Cornelia Rauh, Holger Stark, Robin Trunk

2nd Call for the Forth Spring School – Early Bird by 10th of February

Early bird registration is open until the 10th of February 2020 for the Fourth Spring School on Lattice Boltzmann Methods with OpenLB Software Lab. It is held in Berlin, Germany, from 9th to 13th of March 2020. 

On behalf of the spring school executive committee, Nicolas Hafen, Mathias J. Krause, Harald Kruggel-Emden, Christopher McHardy, Cornelia Rauh, Holger Stark, Robin Trunk

Workshop in Porto Alegre / Brazil Successfully Finished

2019/12/11 | LBM Workshop with OpenLB Software Lab in Brazil Successfully Finished. The executive committee announces the closing of the LBM Workshop with OpenLB Software Lab at UFRGS in Porto Alegre, Brazil. We were happy to host 35 participants including five speakers from LBRG (KIT, Karlsruhe, Germany).

The workshop took place in the framework of the Brazilian-German PROBRAL project “Mesoscopic Molecular Dynamics Simulations: Development of Models and Computational Strategies for Complex Structural Bioinformatics Problems” supported by CAPES and DAAD.

On behalf of the workshop executive committee, Marcio Dorn, Mathias J. Krause, Stephan Simonis.

Spring School 2020 in Berlin – Register Now

Registration is now open for the Fourth Spring School on Lattice Boltzmann Methods with OpenLB Software Lab that will be held in Berlin, Germany, from 9th to 13th of March 2020. The spring school introduces scientists and applicants from industry to the theory of LBM and trains them on practical problems. The first half of the week is dedicated to the theoretical fundamentals of LBM up to ongoing research on selected topics. Followed by mentored training on case studies using OpenLB in the second half, where the participants gain deep insights into LBM and its applications. This educational concept offers a comprehensive and personal guided approach to LBM. Participants also benefit from the knowledge exchange during the poster session, coffee breaks, and the excursion. We look forward to your participation.

Keep in mind that the number of participants is limited and that the registration follows a first come first serve principle.

On behalf of the spring school executive committee, Nicolas Hafen, Mathias J. Krause, Harald Kruggel-Emden, Christopher McHardy, Cornelia Rauh, Holger Stark, Robin Trunk 

OpenLB release 1.3.1 available

Release 1.3.1 is now available for download. This Release includes some minor bug fixes:

  • compilation precompiled mode for HLBM
  • output (particle/bifurcation3d/eulerEuler example)
  • heat map line endings, multiple core execution (laminar/cylinder2d example)

OpenLB Community YouTube Channel Update

We have just released a new Video on our OpenLB YouTube Channel. The Video shows the simulation of a nebulizer which is used to deliver small droplets of medical drugs through the patients lungs.

For further information we created a new show case dealing with this topic: Nebulizer Simulation

The simulation was performed by Mathias J Krause using OpenLB
(www.openlb.net). The Video was created by Alexandra Kerl.

If you have a nice video which you have obtained with OpenLB, please let us know and we will link it or upload it. Please contact us.