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A Coupled Fluid-Structure Simulation for Variable Displacement Pump Used in Vehicle

The defects of constant displacement pumps hinder the modern vehicle to achieve its energy saving goals. Variable displacement pump is becoming the focus of research and development. In the paper, the displacement adjusting mechanism in the pump is treated as a rigid, and its motion leads to a continuously deforming and moving fluid domain. ALE method is used in CFD to overcome the difficulties of the fluid-structure interaction exists in the variable displacement pump. The moving regularity of computing grid and the boundary conditions of the ALE method are reasonably specified, to minimize the computing complexity in the coupled analysis. Experiments on prototype prove the performance of the pump in flow rate and energy saving. The results of analysis agree well with the experimental data, and the motion of the displacement adjusting mechanism is analyzed accurately.