.ClaRa.SubSystems.Furnace.ConvectiveSlice_L4.MechanicalEquilibrium_TB .ClaRa.SubSystems.Furnace.ConvectiveSlice_L4.MechanicalEquilibrium_TBmodel MechanicalEquilibrium_TB = ClaRa.Basics.ControlVolumes.Fundamentals.SpacialDistribution.Homogeneous_L4;