Author: Tim Pertzel

Registration is now open for the Sixth Spring School on Lattice Boltzmann Methods with OpenLB Software Lab that will be held in Greenwich/London, UK from 5th to 9th of June 2023. 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 offers a comprehensive and personal guided approach to LBM. Participants also benefit from the knowledge exchange during the poster session, coffee breaks, and the excursion. We look forward to your participation.

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

On behalf of the spring school executive committee, Nicolas Hafen, Mathias J. Krause, Jan E. Marquardt, Timothy Reis, Choi-Hong Lai, Tao Gao, Andrew Kao

We have just released a new video on our OpenLB YouTube Channel. 

Simulation of a breaking dam using the free surface model included in OpenLB 1.5.

Free surface implementation by Claudius Holeksa, example case and visualization by Maximilian Schecher.

We have just released a new video on our OpenLB YouTube Channel. 

Simulation done by Ashok & Rauleder (Georgia Institute of Technology)

For further information please view the Show Case dedicated to this topic: Ship Motion

We have just released a new video on our OpenLB YouTube Channel. 

In order to showcase the usability and performance of OpenLB’s GPU support, a turbulent nozzle flow was simulated on the HoreKa (KIT, Germany) supercomputer. This case was adapted for higher resolution from the turbulence/nozzle3d example included in OpenLB 1.5. It utilizes a Smagorinsky LES model for the bulk flow and non-local interpolated boundaries for the in- and outflow conditions on top of a single-precision D3Q19 lattice. The simulation’s 2.5 billion cells were computed on 120 Nvidia A100 GPUs divided into 30 nodes. This resulted in a performance of ~250 billion cell updates per second. ParaView was utilized to generate the visualization.

Simulation and Visualization: Adrian Kummerländer

Early bird registration is open until the 10th of May 2022 for the Fifth Spring School on Lattice Boltzmann Methods with OpenLB Software Lab. It is held in Kraków, Poland, from 6th to 10th of June 2022. The school offers a special lecture on LBM on high performance computers and, for the first time, using GPUs with OpenLB (v. 1.5).

On behalf of the spring school executive committee

The developer team is very happy to announce the release of the next version of OpenLB. The updated open-source Lattice Boltzmann (LB) code is now available for download.

Major new features include support for GPUs using CUDA, vectorized collision steps on SIMD CPUs, a new implementation of our resolved particle system as well as the possibility of simulating free surface flows and reactions.

Release notes

GPU support

Citation

PS: Please consider joining the developer team by contributing your code. Together we can strengthen the LB community by sharing our research in an open and reproducible way! Feel free to contact us here.

We are happy to announce that the first version of our Android App OpenLBar is ready for release. OpenLBar allows you to view the results of OpenLB simulations in augmented reality. Below you will find various example screenshots.

Feel free to download the new App and have fun with our example simulations in augmented reality.

Our Spring School event in 2022 was originally scheduled for the 21^th to the 25^th of March 2022. We have now decided to postpone the event, due to obvious reasons. The Spring School will now take place from the 6^th to the 10^th of June 2022. All attendees will receive an additional notification via email. We are optimistic that we can meet in person on this date.

In addition we have updated all webpages regarding the Spring School with the new dates. All details regarding the payment of your attendance fee are now available. The registration is still open for anyone who is interested.

Registration is now open for the Fifth Spring School on Lattice Boltzmann Methods with OpenLB Software Lab that will be held in Kraków, Poland from 21^st to 25^th of March 2022. 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 offers a comprehensive and personal guided approach to LBM. Participants also benefit from the knowledge exchange during the poster session, coffee breaks, and the excursion. We look forward to your participation.

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

On behalf of the spring school executive committee, Nicolas Hafen, Mathias J. Krause, Jan E. Marquardt, Paweł Madejski, Tomasz Kuś, Navaneethan Subramanian, Maciej Bujalski and Karolina Chmiel

(Covid) Virus Risk Simulation of a Person Breathing Using an Air Ventilation Systems with LBM – Simulations in Process Engineering

Are ventilation systems effective against aerosol emission from breathing?

A typical way of transmitting viruses like SARS-CoV-2 is through saliva aerosol particles which are sprayed in the air by coughing or sneezing but also through breathing. If these droplets are inhaled by another person there is a high infection risk. To minimize the potential risk of transmitting the virus through the air ventilation systems should keep aerosol particles concentrations low.

The simulation is able to show the turbulent flight path of the aerosol stream transmitted by a sitting person. This demonstrates the importance and difficulties of a ventilation systems in order to decrease infection risk by reducing aerosol particle concentrations. 

These videos present the aerosol distributions generated by a breathing human. In every breath, 10,000 particles with diameter of 1 μm are omitted through the mouth. The mesh contains 65.5 millions cells (δx=4.8mm). 10 seconds were simulated using a cluster with 400 cores (20 nodes). The source code is available for download on the OpenLB website. 

The fluid flow in the artificial set-up was validated by means of experments and other simulations. These benchmark was published in “Numerical evaluation of thermal comfort using a large eddy lattice Boltzmann method”, M Siodlaczek, M Gaedtke, S Simonis, M Schweiker, N Homma, MJ Krause, Building and Environment, 107618 .

For further information please view our dedicated page about this topic: (Covid) Virus Risk Simulation

Data and Simulation: Simon Berg, Fedor Bukreev, Mathias J. Krause