How is it possible to use the Incompressible (LBM) simulation ? I am not able to choose it in an new project.
Hi @tbaeumer and a warm welcome from the SimScale staff! 
Thanks for your question!
The LBM solver is solely available with the professional plan from SimScale, one of my colleagues will reach out to via mail for more information! Let me know if you have any further questions, I would be more than happy to help you out!
All the best!
Jousef