OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › 2D and 3D HLBM object contact stiffness › Reply To: 2D and 3D HLBM object contact stiffness November 27, 2019 at 10:23 am #4679 mathiasKeymaster There is no stiffness, in the limit it is a hard-sphere collision. But you may add a collision model. Best Mathias