2 1 GfsSimulation GfsBox GfsGEdge {} { Refine 5 Solid (x*x + y*y - 0.125*0.125) RefineSolid 6 Time { end = 5 } SourceViscosity 1. OutputLocation { step = 1 } data positionXYZ OutputLocation { step = 1 } data0.45 positionX0.45YZ OutputLocation { step = 1 } data1.45 positionX1.45YZ OutputSimulation { start = 1.0 } file.gfs } GfsBox { left = Boundary { BcDirichlet P 1 } top = Boundary { BcDirichlet U 0 BcDirichlet V 0 } bottom = Boundary { BcDirichlet U 0 BcDirichlet V 0 } } GfsBox { right = Boundary { BcDirichlet P 0 } top = Boundary { BcDirichlet U 0 BcDirichlet V 0 } bottom = Boundary { BcDirichlet U 0 BcDirichlet V 0 } } 1 2 right