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The positive displacement motor (PDM) is a typical hydraulic machine, which is widely used in oil-drilling, geologic exploration and so on. In our study, the immersed boundary method (IBM) is applied to simulate the whole dynamic process for this particular fluid-structure interactive system, which includes the FEM and FDM modeling for the both of solid and fluid domains of PDM, separating and reuniting of fluid domain when PDM works, the problem of contact and deal between its rotor and stator, and the numerical scheme respectively. At last, the pressure and stress distribution of the elastomeric housing attached to the stator of PDM is determined, which is not sufficiently researched before and of importance to PDM’s work-life.

simulation, numerical methods