http://www.lbmethod.org/openlb/ This is an RSS feed for the OpenLB project. New releases and important updates to the web site are announced here. en-us Copyright 2006-2008 Jonas Latt Wed, 14 May 2008 06:00:00 GMT http://www.lbmethod.org/openlb/download.html <a href="http://www.lbmethod.org/numerics:gallery"><img src="http://www.lbmethod.org/openlb/gif/thumb_rb2d.gif" width="100" height="100" border="0" align="right" hspace="15" vspace="5" alt="2D Rayleigh-Benard convection"></a> May 14, 2008 -- OpenLB Multiphysics released. This framework enables to couple block-lattices together, and/or to couple block-lattices with data fields. Current applications are multi-component fluids based on the Shan/Chen model, and thermal fluids with Boussinesq approximation based on the model by Guo e.a. The release contains examples for both models in 2D and in 3D which compile in serial and in parallel. <br/><br/> Improved MPI parallelization. In a benchmark setting, the example program <tt>cavity3d</tt> was measured to run at 3.5 Giga site update per seconds on 4096 processors measured for <br/><br/> Improved Input/Output. VTK output was extended to work in 2D additionally to 3D. Type conversion for output data is now supported. An application of this is to save data from a double precision floating point simulation into a single precision VTK file. A new method was added for producing ASCII output, which works in serial and in parallel. http://www.lbmethod.org/openlb/download.html March 28, 2008 -- Reduction operations were recognized to be a bottleneck for OpenMP parallelism. With an appropriate fix, a substantial speed up could be achieved. OpenMP is now almost as fast as MPI in a multi-core environment... http://www.lbmethod.org/openlb/download.html March 1, 2008 -- MPI parallelism was reshaped and extended. All example programs compile with MPI now and execute properly in parallel. MPI parallel program are substantially accelerated on some platforms. http://www.lbmethod.org/openlb/download.html January 5, 2008 -- A few corrections to ensure compiler compatibility. http://www.lbmethod.org/openlb/download.html January 1, 2008 -- The new release is completely revised: MPI parallelism, extended I/O, enhanced user guide and more ... http://www.lbmethod.org/openlb/download.html August 15, 2007 -- Some more work was needed to have the OpenMP version of the code compile on various platforms. Furthermore, the periodic boundary condition (which you get for example by invoking the method stream() with a parameter true) contained inaccuracies along the edges in 3D. This was fixed. http://www.lbmethod.org/openlb/download.html July 17, 2007 -- A parallel version of OpenLB is released! Mathias added OpenMP directives, and the code runs in parallel on shared memory platforms. http://www.lbmethod.org/openlb/download.html June 24, 2007 -- This time, part of the OpenLB code has been rewritten from scratch (without changing the user interface, of course). The architecture of the PostProcessors was redesigned in order to allow for an easy integration of PostProcessors into complicated data structures (e.g. parallelization of PostProcessors). Furthermore, the LatticeDescriptors were extended: they can now integrate a field of external scalars into a cell. In that way, an external force can for example be integrated into a simulation. The useCase "forcedPoiseuille.cpp" illustrates this points. Further changes are: - The blockLattices implement periodic boundary condition, implemented by Orestis. Use the additional boolean parameter (default is false) to the function call to stream() and collideAndStream(). - A bug in the template specialization of the regularized LB dynamics, detected by Bernd, was fixed - The outflow condition in the Matlab and OpenLB programs for a flow around the cylinder was turned to first-order accuracy. As remarked by Mathias and Jan, this increases the numerical stability. http://www.lbmethod.org/openlb/download.html November 9, 2006 -- Ooops, 3D problems in release 2 don't compile properly any more. This has been fixed in the current release http://www.lbmethod.org/openlb/download.html November 6, 2006 -- The code contains workarounds for some (not so old) versions of the Intel and PathScale compilers. The classes BlockLatticeView2D and BlockLatticeView3D were reviewed from scratch so that subsamples of an initial block really behave like a block themselves. http://www.lbmethod.org/openlb/contact.html August 30, 2006 -- A section is added to the main menu of the webpage. It gives a few guidelines on how OpenLB users can contribute to the project. A FAQ answers two of the most commonly asked questions so far. http://www.lbmethod.org/openlb/download.html July 27, 2006 -- Bug fix in the naming of the default directories in release 0.1r0. Graphics output did not work properly because of incompatible directory names. http://www.lbmethod.org/openlb/download.html July 12, 2006 -- First release of the "Version 0 - series". Note that the interface of the library has not yet stabilized and may change quite substantially before the Version 1 - release. The current code supports 2D and 3D simulations, various types of lattices, and a full set of local and non-local boundary conditions. Parallelization and grid refinement are under development and will be published in the upcoming releases. http://www.lbmethod.org/openlb/ July 04, 2006 -- Website is on-line. The site contains an introduction to the lattice Boltzmann methods, coding examples in various programming languages, and a book review.