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Efficient Large Scale Fluid Flow Simulations on Magnus using up to 32,784 Cores at Curtin University

by Mathias J Krause, Andrew JC King, Nima Nadim, Maciej Cytowski, Shiv Meka, Ryan Mead-Hunter, Hermann Nirschl, Benjamin J Mullins

In a joint project of the Lattice Boltzmann Research Group (LBRG) at the Karlsruhe Institute of Technology (KIT) and the Fluid Dynamics Research Group (FDRG) of the Curtin Institute for Computation (CIC, Curtin University), OpenLB was tested, profiled and improved on the Pawsey Magnus super computer (TOP500 at 358 Nov. 2018) and then applied to large scale fliter simulations. This represents one of the largest scale CFD simulations in the world.

Filter Simulation 3D

The performance of OpenLB was evaluated for a realistic scenarios at the Magnus super computer (TOP500 at 358 Nov. 2018) using up to 32,784 of the available 35,712 cores obtaining 142,479 MLUPs. That are about 142 billion fluid cells which were updated in one second using OpenLB on Magnus. This proves the computational efficiency and scalability of OpenLB, which will allow it to solve some of the largest and most important fluid flow problems relevant to process engineering and a range of other fields.

Magnus Performance Results: MLUPps (Mega Lattice UPdates per processing unit andsecond) as a function of cores

A new look and feel for

We just published our new project page for OpenLB. You can find it at We have added a lot of features to improve the usability of our webpage. Our goal is to make it as easy as possible for you to find the necessary resources.

Improvements include

  • A completely new and improved design
  • New information packed frontpage
  • completely new Forum section (Don’t worry. All your old posts have been moved to the new forum and you can still use your existing username and password.)
  • The navigation menu on the left-hand side is now faster than ever
  • Completely reworked news section
  • Optimization for mobile devices

Please feel free to message us here if you encounter any bugs or problems on the new website.

Spring School 2019 successfully finished

2019/02/22 | 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 46 participants from 12 countries and 3 continents, including three invited speakers in Mannheim, Germany.
This year’s poster award goes to Moritz Lehmann from the Universität Bayreuth, Germany.

On behalf of the spring school executive committee, Natascha Heß-Mohr, Mathias J. Krause, Matthias Rädle, Robin Trunk.