Due to recent bot attacks we have changed the sign-up process. If you want to participate in our forum please send a message via our contact form. › Forums › OpenLB › General Topics › Defining Material Numbers › Reply To: Defining Material Numbers June 18, 2020 at 7:54 pm #5035 michael.gianfeliceParticipant I’m not sure if it is just my browser but that page is blank for me.