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 › mrtCollision operator in OpenLB › Re: mrtCollision operator in OpenLB July 16, 2018 at 2:59 pm #2881 EricParticipant Dear Mathias, Thank you very much for you explanation! Best regards, Eric