OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Fluctuation on thermal field with curved boundaries › Reply To: Fluctuation on thermal field with curved boundaries January 19, 2021 at 7:46 pm #5452 mathiasKeymaster You can create a functor which depends on the exact position and gives you the values (e.g. 300, 302 or whatever) and use it to define the boundary condition. Similarly a quadratic inflow profile is used for a pipe.