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What are the features of the FSI library? The pipe models of the conventional DSHplus pipe library solve the momentum and continuity equation of the fluid in order to determine the temporal and spatial development of the state variables pressure p and volume flow Q. For the FSI components, twelve additional equations are solved for the six degrees of freedom (with one force and one displacement quantity each) of the pipe wall. The degrees of freedom of the pipe wall considered are shown in the adjacent figure. The 14 equation model of the FSI library allows the consideration of the following phenomena: Torsion of pipelines around their longitudinal axis Bending of the pipelines where the inertial mass of the fluid and shear deformation are taken into account Elastic or viscoelastic pipe supports, e.g. by clamping units Coupling of axial stresses in the pipeline with the pressure of the fluid (POISSON effect) Exchange of forces and moments at elbows