you can scale-up all OpenLB examples by increasing the resolution. In a common project we are happy to share the Virus Risk Simulation and others. I will take up your idea and discuss with the other contributers with the aim of including at least one larger-scale real life application in the next release. Since then, we will have a GPU-version, I think it is a good idea. Further, you may come to our next spring school and bring your own problem. Within a week we will teach you to get it started.