Scientific report



Description, Aims and Achievements


The Lattice Boltzmann method is a relatively new computational methodology but already widespread and well established. During the last years it has demonstrated numerous advantages with respect to other computational methods. These include not only highly efficient parallelization and implementation techniques, but also advanced models bridging the physics between microscopic systems and macroscopic applications.


The scope of the present workshop was to bring together scientists who are currently using the Lattice Boltzmann technique to study computationally challenging problems in different application areas. Our expectation was to obtain a clear picture of where the methods have been pushed so far, which validations have been performed, which techniques and know-­how could be transferred between different application areas / communities. These aims and expectations have been achieved by up to 53 participants from different scientific fields who participated in the workshop and discussed the various aspects of the method. Very positive feedback has been obtained from various participants on the scientific gain of the workshop.


The workshop covered five days and four themes: “Flow at the microscales'', “Turbulent and multiphase flows'', “Biological fluid dynamics and soft condensed matter'', and “Model development''.


The Lorentz Center facilities really helped in creating a friendly and interactive atmosphere amongst participants. The scientific level of the presentation was very high and focused on the state-oftheart in respect to where the method has been pushed for different scientific problems. The combination of key-experts and young scientist helped in creating a very interactive atmosphere.


During the workshop there has been a session on the scientific activities of the Dutch community working with the Lattice Boltzmann method. This session has been organized in the context of the activities of the JM Burgerscentrum ( contact group on Lattice Boltzmann techniques.


A round table was organized to discuss the Lattice Boltzmann in relation to Engineering Applications, while a day was reserved to discuss Lattice Boltzmann in relation to industrial problems. Multiphase and multicomponent flows are indeed ubiquitous in industry and the Lattice Boltzmann is a tool which offers large possibilities in terms of physical modeling, with relative ease of implementation and adaption to complex flow geometries. The industry day has been co-organized by Ramin Badie (ASML, Veldhoven, The Netherlands), Xiaowen Shan (EXA Corporation, Boston, USA), Herman Wijshoff (Océ, Venlo, The Netherlands). Xiaowen Shan presented the experience of EXA Corporation and its commercial solutions. Ramin Badie and Herman Wijshoff presented a list of scientific problems involving fluids where the Lattice Boltzmann method could have good advantages with respect to other flow solvers. This session was well received and many scientists reacted with immediate feedback.


Another point that was addressed is the possibility to develop a community Lattice Boltzmann code. Our vision is that the Lattice Boltzmann method is now in its maturity and has all the capabilities to provide a community code which can incorporate fluid dynamics and different physics at disparate scales. A round table was organized to discuss about this possibility. All participants considered the idea relevant and we had rather extensive discussions on what could be the best technical choice to make first steps in this direction. Former attempts were discussed critically and the community decided to:


1) immediately start a virtual meeting point where experts can exchange information as well as data, code examples, etc;


2) circulate a document with the minutes of the discussion on the community code and a form to be filled by different groups to better characterize their requirement, expectations and current codes.


We would like to thank on behalf of all participants the staff of Lorentz Center for their efficient help and support which made this workshop possible. We also thank the sponsors which contributed to the success of this initiative.


Herman Clercx

Jens Harting

Sauro Succi

Federico Toschi