The interaction of structural elements with the turbulent flow of the coolant leads to the appearance of various types of mechanical vibrations. Cyclic stresses associated with vibrations lead to the accumulation of fatigue damage and subsequent destruction of the elements. Friction at the points of contact of moving elements leads to wear and subsequent destruction of the sheath. The FSI (fluid structure interaction) approach is used to simulate deformable structural elements oscillations, in which the flow is calculated along the oscillating body, and as a result, the hydrodynamic forces are used to simultaneously calculate the dynamic displacement. With this approach, the calculation of nonstationary loads acting on deformable elements is performed using CFD codes and solid mechanics codes.

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