News

2017/09/13 | Registration Open for the Second Spring School on Lattice Boltzmann Methods with OpenLB Software Lab. Registration is now open for the spring school Lattice Boltzmann Methods with OpenLB Software Lab that will be held in Karlsruhe, Germany, from 19. to 23. March 2018. 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 is probably unique in the LBM community and offers a comprehensive and personal guided approach to LBM. Participants also benefit from the knowledge exchange during poster session, coffee breaks and the excursion. We look forward to your participation.

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

Registration: http://www.openlb.net/spring-school-registration
More information: http://www.openlb.net/spring-school-2018

On behalf of the spring school executive committee, Ezeddine Sediki, Mathias J. Krause, Mahdi Tekitek, Albert Mink.


lidDrivenCavity2017/06/07 | OpenLB Community YouTube Channel Update. A new video shows the results of a famous benchmark problem in CFD. The lid driven cavity problem illustrates a flow in a cuboid. The top wall moves from left to right with a constant velocity, while the other walls are fixed. The fundamental feature of this often studied fluid flow problem is the formation of a large primary vortex in the center and two smaler vortices near the two lower edges. Different techniques are applied to visualize the fluid flow including the vortices with the cavity. The source code of this simulations can be found in the examples section of the latest release of OpenLB. You will find more information in our show case section.

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.


2017/04/27 | Running OpenLB on Windows 10 in few minutes. A new Tech Report on how to install OpenLB on Windows 10’s Ubuntu Bash has been contributed by Jesse. It enables using OpenLB on Windows 10 platforms in a few minutes. It is available for download.

2017/04/12 | Release 1.1 Available. The OpenLB developer team is very happy to announce that a new release of the open source Lattice Boltzmann Method (LBM) code is available for download as well as a new doxygen documentation. Have a look and be excited!

The new features and interfaces are:

  • New user-friendly features:
    • Generation of real-time plots of simulation data, realized with Gnuplot (see examples cylinder2d, cavity2d and tgv3d)
    • Implementation of plot over line feature to get characteristic data (see example cavity3d)
    • Convergence check for steady state (see examples cavity2d and cavity3d)
    • Introduced zLib compression to reduce size of VTK data
    • Implemented Hertz-Mindlin forces for particulate flows
    • New 3D slip boundary condition
  • Performance improvements:
    • Speed-up of about 20 percent using vector instruction sets of modern compilers
  • Minor improvements and developer notes:
    • Included zLib library for VTK data compression
    • Updated VTK format from pvd to vtm for single time steps
    • Efficiency improvements of all functors
    • Fixed bug with GifWriter
    • Improved implementation of turbulence models (e.g. Smagorinsky, see examples tgv3d and nozzle3d)
    • Removed several memory leaks
    • Moving towards C++11
  • All examples updated
  • Compatibility tested on MacOS X clang 800.0.38, Windows Cygwin gcc 4.9, Windows 10 Ubuntu bash gcc 4.8, Linux with gcc 4.8 and higher, clang 3.6 and higher and Intel 14.0 and higher, OpenMPI 1.8 and higher, Intel MPI 5.0 and higher

PS: Please consider to join the developer team, by contributing your code and strengthen the LB community by sharing your research in an open and reproducible way!


springschool2017/03/10 | LBM Spring School with OpenLB Software Lab successfully finished. The executive committee announces the closing of the first LBM Spring School with OpenLB Software Lab. We were happy to host 64 participants from 10 countries, including four invited speakers in Hammamet Tunisia.

Ridha DJEBALI quoted: “I would like to thank you, your team and all the participants in this LBM training where they shared with us their experiences. The Tunisian participants were impressed by the quality of the teamwork you have shown and your young researchers, cool, cooperative was endowed with patience as it is necessary for hard days of work and have honoured the institute KIT.”

On behalf of the spring school executive committee, Ezeddine Sediki, Mathias J. Krause, Mahdi Tekitek, Albert Mink.


bifurcation3d2017/03/02 | OpenLB Community YouTube Channel Update. A new video shows the results of two approaches for the simulation of particulate fluid flows, one is based on an Euler-Euler and the other on an Euler-Lagrange model. Both approaches are tested on a benchmark problem, where the deposition rates are computed in a bifurcation for given particle sizes. They yield the same results but differ in efficiency regarding the field of application. The source code of this simulations can be found in the examples section of the latest release of OpenLB. You will find more information in our show case section.

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.


2016/09/15 | Registration Open for First Spring School on Lattice Boltzmann Methods with OpenLB Software Lab. Registration is now open for the spring school Lattice Boltzmann Methods with OpenLB Software Lab that will be held in Hammamet, Tunisia, from 6. to 10. March 2017. The spring school introduces scientists and applicants from industry to the theory of LBM and trains them on practical problems. The first three days are dedicated to the theoretical fundamentals of LBM up to ongoing research on selected topics. Followed by two days of mentored training on case studies using OpenLB, the participants gain deep inside into LBM and its applications. This educational concept is probably unique in the LBM community and offers a comprehensive and personal guided approach to LBM. Participants also benefit from the knowledge exchange during poster session, coffee breaks and the excursion at the Mediterranean sea. We look forward to your participation.

Registration: http://www.openlb.net/spring-school-registration
More information: http://www.openlb.net/spring-school-2017

On behalf of the spring school executive committee, Ezeddine Sediki, Mathias J. Krause, Mahdi Tekitek, Albert Mink.


rayleighBenard3d2016/06/09 | OpenLB Community YouTube Channel Update. A new video shows the highly turbulent particulate fluid flow in a dynamic cross-flow device, simulated with a DEM-LB model on a high performance cluster unsing OpenLB. Together with the fluid, the particle enter the geometry at a small inlet at the top. They are filtered by a membrane at the bottom. You will find this example in our show case section.

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.


2016/05/12 | Introduction to Particulate Flow Simulations. A three day course in GERMAN LANGUAGE is held in Karlsruhe from the 28th to 30th of September 2016. In addition to a theoretical introduction, one full day is dedicated to Lattice Boltzmann Methods and OpenLB. Please check out the program for more information.


2016/03/10 | Release 1.0 Available. The OpenLB developer team is very happy to announce that a new release of the open source Lattice Boltzmann Method (LBM) code is available for download as well as a new user guide and new doxygen documentation. New examples and models for particulate fluid flow simulations and many user-friendly interfaces have been added. The performance of standard 3D models has been improved by up to 30 percent. Have a look and be excited!

The new features and interfaces are:

  • New user-friendly feathers
    • Additionally to the parallel vtk-file output, image files of cut planes can be produced easily saving a lot of developer’s time. All examples are updated with this feature.
    • Simulation states and functor results can be saved and loaded in parallel, simplifying the post-processing process and enabling back-up of intermediate simulation states (cf. examples bifurcation3d/eulerLagrange, bstep2d, bsteps3d)
    • Output folders are created automatically
  • Support of non-Newtonian fluids and fluid mixtures based on power law model
  • Support of particle suspensions
    • Euler-Euler based ansatz, solving an extended advection-diffusion equation for the particle phase plus standard LBM for the fluid phase.
    • Euler-Lagrange based ansatz, using a Discrete Element Method for particle phase plus standard LBM for the fluid phase.
    • Including new boundary conditions
    • Two validated examples (bifurcation3d/eulerEuler, bifurcation3d/eulerLagrange) added solving the same particle deposition problem with the two new methods
  • New turbulence models such as ADM and Shear Smagorinsky (cf. example nozzle3d)
  • New 2D slip boundary condition
  • Speed-up of standard 3D models by up to 30 percent
  • Functor concept expanded, providing new features and a more user-friendly management of pre- and post-processing
    • Data functors to store intermediate results
    • Efficiency improvements of all functors
  • All examples updated
  • Compatibility tested on MacOS X clang 7.0.2, Windows Cygwin g++ 4.9.2, Linux with gcc 4.4.7, 4.8.2, 4.9.1, 4.9.3, 5.3.0, clang 3.6.2 and intel 15.0.2

PS: Please consider to join the developer team, by contributing your code and strengthen the LB community by sharing your research in an open and reproducible way!


rayleighBenard3d2016/01/03 | OpenLB Community YouTube Channel Update. A new video shows the classic thermal convection benchmark problem of flow and temperature dynamics. The bottom is heated with a small pertubation at the center, at the top a constant lower temperature is applied and at the side the heatflow is assumed to be periodic. You will find this example in our show case section.

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.