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 › Output of channel3D in examples of openlb › Reply To: Output of channel3D in examples of openlb March 31, 2021 at 8:26 am #5581 mathiasKeymaster Hi Xu Yang, there should be a functor for it. See dogygen ducumentation on the website. Best Mathias