OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Claculate Force Term in OpenLB (rayleigh benard problem) › Reply To: Claculate Force Term in OpenLB (rayleigh benard problem) August 4, 2022 at 4:30 pm #6752 mathiasKeymaster Material 4, there is just one voxel. Numerically, that is not enough to have an outflow or inflow with only one voxel. Best Mathias