OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Multiphase flow Contact angle and surface tension setting › Re: Multiphase flow Contact angle and surface tension setting October 14, 2016 at 3:15 pm #2466 mathiasKeymaster You need to define the right density at the boundaries (defineRho or for bounce back in the constructor), i.e. 1 for attracting and 0 for repelling. Best Mathias