2015/03/11 | New Release 0.9 Available. New Release 0.9 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. Besides new examples, many innovative and user-friendly interfaces have been added. Have a look and be excited!

The new features and interfaces are:

  • User-friendly build-in pre-processing:
    • Geometries can be imported as surface mesh from an stl-file as well as created by functors as union, intersection or complement of provided geometry primitives such as cuboids, spheres, cones, cylinders and many more.
    • Automatic volume mesh generation and load-balancing for parallel execution.
    • Boundary conditions can be set by analytically pre-defined or user-defined functions.
  • Advanced parallelization for geometry handling as well as vtk-file output.
  • Functor concept further developed, providing new features and enabling a more user-friendly management of pre- and post-processing:
    • Indicator functors representing geometrical primitives such as cuboids, spheres, etc., which combined with arithmetic operators allow creation of more complex geometries by union(+), intersection(*) and relative complement(-) of primitives.
    • Strain rate, dissipation rate, velocity, pressure … functors deliver results in SI units.
    • Flux, drag and lift functors compute integrals over surfaces.
    • Norm functors consider convergence in specific norms (cf. poiseuille2d).
  • New turbulence models, such as Consistent Strain Smagorinsky.
  • New parallel vtk-file output interface for functors.
  • All examples updated with a newly developed generic structure helping to set up user-defined examples more easily.
  • New examples venturi3d, nozzle3d, phaseSeparationXd illustrating important existing and new features.
  • Compatibility tested on Mac, Windows Cygwin, Ubuntu with gcc 4.3.4, 4.7.3, 4.8.2, 4.9.1, 4.9.2 and intel 14.0.4

PS: Please consider to contribute code or join the developer team yourself to strengthen the LB community by sharing your findings in an open and easily reproducible way!

valveMoncalvo2014/06/26 | OpenLB Community YouTube Channel Update. A new video shows a multi-component flow in a micor mixer, simulated with the a DEM-LB model. 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.

valveMoncalvo2014/03/20 | OpenLB Community YouTube Channel Update. A new video shows a turbulent flow in a savety valve, simulated with the a Smagorinsky LB model. 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.

2013/12/12 | Documentation updated. A new user guide is available as well as new dogygen documentation.

2013/11/21 | New Release 0.8 Available. New Release 0.8 Available. The OpenLB developer team is very happy to announce that a new release of the open source Lattice Boltzmann Method (LBM) code is from now on available for download. Besides many new features, a lot of new interfaces have been added. Have a look and be excited: you will find OpenLB much more user-friendly. The code have been tested with gcc-4.3.4, gcc-4.6.4, gcc-4.7.3 and intel-12.1.13 compilers. New features are:

  • New model to simulate flows in isotropic porous media (PorousBGKdynamics).
  • New model to simulate turbulent flows (SmagorinskyBGKdynamics, smagorinskyMRTdynamics, yPlus functor).
  • New model (Bouzidi) for curved boundaries (OffLatticeBoundaryConditions) with automatic assignment from stl-files.
  • All examples updated with a newly developed generic structure which will help to set up user-defined examples more easily. The layout now always includes functions for initialization of the lattice and the geometry, the re-setting of boundary values before and during the simulation and the writing of data to the console and to vtk-files.
  • Generic Functor concept implemented which includes new features and enables user-friendly handling of pre- and post-processing:
    • Indicator functors for geometric objects like cylinders, balls, cuboids and more.
    • Analytical functors for a stable and smooth starting of simulations (polynomialStartScale, ..) (cf. examples/cylinder3d).
    • Lattice functors for the computation of boundary force, drag force, dissipation, ….
    • Lattice functors for the interpolation of computed results on arbitrary positions..
    • Collective lattice functors to compute norms (e.g. L1, L2), max, min or averages of arbitrary computed results on a lattice.
    • Arithmetic operators (+,-,*,/).
    • Generic functor interfaces for vtk-output (cf. examples/cylinder3d).
    • Functors for rotating coordinate systems (Coriolis and centrifugal force functors).
  • New example (examples/aorta3d) illustrating new features like the Smagorinski model, Bouzidi boundary condition and functors.

2013/11/19 | OpenLB Community YouTube Channel. A new video shows Rayleigh-Bénard convection in 2D, simulated with the thermal LB model by Z. Guo et al.. In this special case, thermal flow is simulated between a hot plate at the bottom, a cold plate at the top and is assumed to be periodic at the sides. You can find the source code as OpenLB example at “/examples/thermal2d/rayleighBenard2d.cpp”. For this video the parameters Rayleigh=1e+8, Prandtl=1, N=100 (long version: N=300) and dt=0.0001 have been chosen.

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.

2013/05/10 | The OpenLB Family is Growing. We are happy to welcome our new partners, the “Technische Universität München (Germany)”, “Universidade de São Paulo (Brazil)” and “Changchun Institute of Optics, Fine Mechanics and Physics (China)”. If your organization also wants to participate or you, as a person, want to contribute code, documentation or videos of simulations done with OpenLB, please contact us.

2012/02/13 | New Release 0.7 Available. A new module allows to analyze the performance of computations and runtime estimations (cf. “examples/cavity2d”). The console output is standardized including sequential and parallel output. Further, a rewritten unit converter enables direct conversion between physical and internal lattice units. The usage of the XML interface is simplified by direct class constructions from XML parameter files, illustrated in “examples/cavity2d”. This example includes also a description file for OpenGPI, which provides a graphical user interface. Finally, the CVMLCPP-library has been updated to ensure compatibility with gcc-4.6.

2012/01/11 | Forum on LBM and OpenLB Added. With the intension to allow discussions on OpenLB and Lattice Boltzmann Methods in general a new forum has been added to the OpenLB-website. Furthermore, a section concerning upcoming conferences and workshops on LBM has been included. This allows organizers to promote their events by informing the community e.g. by a short descriptions and links. 

2012/01/10 | On the Way to the Wing Car. In racing, nothing works without innovative concepts and ideas in order to keep up with the competition. In the context of the student design competition “Formula Student” the “Hochschulgruppe” KA-RaceIng in cooperation with the Engineering Mathematics and Computing Lab (EMCL) are developing an aerodynamics package for the new racing car of the Karlsruhe Institute of Technology (KIT). For example in the Formula 1 spoilers and diffusers are already established techniques and with increasing importance an elementary component of competitive vehicles. In the recent seasons of “Formula Student” consideration of the aerodynamics has been introduced in Europe. Using the software OpenLB, which is co-developed at the EMCL, simulation and optimization of the vehicle based on the current model of the KIT12 is carried out. On this basis a new wing packet, consisting of front- and rearwings as well as a diffuser is designed. The findings of the computations can be directly implemented in the constructive process in order to obtain a holistic approach  ailored to a 200kg heavy and 100hp strong car. In a first step an underbody has been constructed and simulated, which will be validated on the KIT12 prototype. Based on these results the pending simulation of the wings and the analysis of the entire vehicle will be carried out.

2011/06/22 | Mimics Innovation Awards for Preprocessing Approach Realized in OpenLB. The contribution “A Preprocessing Approach for Innovative Patient-Specific Intranasal Flow Simulations” of Krause (EMCL), Gengenbach (EMCL), Mayer (SCC), Zimny (EMCL) and Heuveline (Head of EMCL) has won the Mimics Innovation Awards 2011 in the category 2 “Innovations in computer aided engineering”. The prize was given for their work related to the international open source project OpenLB and EMCL’s project United Airways. In the paper the researchers present a holistic concept enabling patient-specific airflow simulations in the nasal cavity based on CT data. A proof of conception is provided by means of a case study where advantage is taken of Materialise’s software packages to segment the raw CT data in order to create a 3D model. The meshing, initialization and simulation is automated and realized in the framework of the CFD software package OpenLB.

>2011/05/11 | New Release 0.6 Available. The new release offers an automated preprocessing with built-in voxelization from stl-files and setting of boundary conditions based on material numbers. The usage is illustrated by the example “examples/cylinder3d”. Further, an XML reader offers an interface for input parameters (cf. “examples/cavity2d”).

2010/11/10 | New Team Member Thomas Henn. Thomas Henn joined the OpenLB project. He contributs code for reading STL files, which are surface representations of geometries consisting of triangles, and mesh generation for the use in OpenLB. He integrated CVMLCPP which is a common versatile multi-purpose library for C++. In OpenLB it provides the needed methods for the voxelization.

2010/10/13 | New Team Member Jonas Fietz: Jonas Fietz joined the OpenLB project recently. He contributs code for config file parsing based on XML for the upcoming release. He is also core developer of another open source project called OpenGPI which is a generic parameter interface.

2010/08/20 | Homepage relaunched.

2009/07/27 | Intel Itanium Arward for Parallelization Apraoch Realized in OpenLB. The United Airways project has been awarded from the Itanium Solutions Alliance. The computations were perfomed in parallel using the OpenLB code.

*** Karlsruhe University’s United Airways project in Germany used Itanium-based HP hardware to analyze the interaction of the human nose, sinuses, larynx and lungs with the goal of compiling a complete numerical simulation of flow behavior in the human respiratory system. The end benefits of this project include optimizing asthma sprays, improving the quality of medical operations and understanding the impact of respirable dust. ***