Cavitation two-phase flow water power reconstruction method based on numerical flow field and derivative moment theorem

The invention discloses a two-dimensional cavitation two-phase flow water power reconstruction method based on a numerical flow field and a derivative moment theorem, and belongs to the technical field of ship industry and fluid machinery. The implementation method comprises the following steps of: reconstructing hydrodynamic force suffered by a moving object in the cavitation flow field into an unsteady hydrodynamic expression based on a flow field local dynamic variable by applying a derivative moment transformation theory, and combining an unsteady vortex evolution behavior of the flow field with macroscopic hydrodynamic force. The reconstruction hydrodynamic force formula can analyze the influence mode and the quantification degree of the development and evolution of different local space vortex systems on hydrodynamic force contribution. According to the two-dimensional cavitation hydrodynamic reconstruction formula, a channel for obtaining hydrodynamic force from a flow field is established, flow field