"Capilllary rise and fluid-solid contact angle in Lattice Boltzmann simulations"
We have studied numerically the capillary rise in simple (circular and rectangular capillary tubes) and more complicated (fracture) geometries. We use the Lattice Boltzman method. In the simplest version of the algorithm the contact angle that the wetting fluid has with the solid surface is highly dependent on the choice of fluid that initially coats the surface. This is a result of lattice pinning and can be fixed with a slight change to the method. We show that our method also provides the correct interfacial pressure drop in the case where the surface has two independent finite radii of curvature.