Fluid-structure interaction analysis of aviation gear pumps based on conservation-enhanced RBF

In fluid-structure interaction simulations of aviation gear pumps, two key issues: the distinct geometric mismatch between fluid and solid domains resulting from radially scaling gears to connect gapless tooth tip and meshing zone flow fields; and the notable risk of inaccurate load transfer due to the classical radial basis function (RBF) mapping algorithm neglecting fundamental physical conservation principles, were addressed in this research. To solve these critical problems, force and moment conservation constraints were carefully introduced between the source and target domains. The minimum norm method was effectively employed to correct the target field grid pressure, and an advanced RBF data reconstruction algorithm with significantly enhanced conservation properties was successfully proposed. Combined with detailed grid analysis and rigorous experimental verification, comprehensive fluid-structure interaction simulations were conducted for a specific type of aviation gear pump. Test results showed that the advanced RBF algorithm effectively eliminated total force and moment deviations, with an average mapping error as low as 0.0015%. When loading flow field loads onto solid grid nodes by the advanced RBF algorithm, the static maximum equivalent stress was measured at 31.61 MPa, and the dynamic meshing stress peak reached 192.18 MPa. The flow field pressure contributed 34.38% to solid stress and 29.84% to strain, respectively. These important findings clearly demonstrate that fluid-structure interaction simulation is highly necessary for accurately evaluating the actual service status of aviation gear pumps in practical operational environments.