Underworld Underworld/BaseApps/RayleighTaylor.xml StgFEM_FrequentOutput Underworld_Vrms StgFEM_CPUTime MaterialViscosity 1.0 Everywhere RheologyMaterial backgroundShape 1.0 backgroundViscosity BelowCosinePlane 0.2 0.02 1.8284 0.0 MaterialViscosity 1.0 RheologyMaterial lightLayerShape 0.0 lightLayerViscosity true f 2 f 2 f 2 400 10 ./output/ ./checkpoints/ 1.0 400 2 64 64 1 1 0.0 0.0 0.0 0.9142 1.0 1.0 True True random 20 13 Underworld/VariableConditions/velocityBCs.freeslipSides.xml Underworld/Viewports/ParticleDensityVP.xml Underworld/Viewports/StrainRateInvariantVP.xml glucifer/window.xml glucifer/BuildMovies.xml ParticleDensityVP StrainRateInvariantVP