2 1 GfsSimulation GfsBox GfsGEdge {} { Refine 5 Time { end = 5 } SourceViscosity 1. OutputLocation { step = 1 } data positionXYZ OutputLocation { step = 1 } data0.45 positionX0.45YZ OutputLocation { step = 1 } data1.45 positionX1.45YZ } GfsBox { left = Boundary { BcDirichlet U 1 } top = Boundary { BcDirichlet U 0 BcDirichlet V 0 } bottom = Boundary { BcDirichlet U 0 BcDirichlet V 0 } } GfsBox { right = BoundaryOutflow top = Boundary { BcDirichlet U 0 BcDirichlet V 0 } bottom = Boundary { BcDirichlet U 0 BcDirichlet V 0 } } 1 2 right