Application Of OpenFOAM In The Numerical Study Of Rotor-stator Interaction For Centrifugal Pump

Setting the clarification of the internal rotor-stator interaction phenomenon of the centrifugal pump as a starting point,based on the modified equation of fluid motion with more linear superiority,we successfully build a new numerical simulation solver by using Open FOAM,an open source computational fluid dynamics platform.After systematically analyzing the discretization characteristics and errors of the modified equation of fluid motion and validating the new solver,the mature numerical example supported by proven data,ERCOFTAC centrifugal pump,was chosen to be the numerical simulation object.Then the rotor-stator interaction phenomenon in the internal flow of the centrifugal pump is numerically studied.By comparing the numerical simulation results with the experimental data,the feasibility of applying Open FOAM and the modified equation of fluid motion to the numerical simulation of the internal flow of the centrifugal pump is validated.Firstly,the derivation and error analysis of the modified equation of fluid motion is completed based on the scale invariance theory.The linear advantage of the modified equation is analyzed,the internal relations between modified equation and N-S equations are discussed while the feasibility of applying the modified equation to the transport phenomena analysis is also demonstrated.Theoretically,it is proved that the more stable truncation error of the modified equation reduce the numerical oscillation in the numerical simulation calculation,accelerate the convergence speed of numerical simulation calculations and make the numerical simulation results more accurate.Secondly,based on the finite volume method,the construction of the new numerical simulation solver is completed in Open FOAM.This solver is also verified by both the airfoil flow model and the secondary flow in the curved duct.Theoretically,the linear advantage of the new solver is highlighted,the ability that the solver can suppress the numerical error is proved.This solver can also accelerate the calculation iteration to ensure the calculation accuracy,improve the calculation efficiency while reducing the calculation load.In the airfoil flow calibration process,the advantages of the new equation solver in calculation efficiency and accuracy when facing complex flow analysis problems are proved.The mesh adaptability and the calculation accuracy of the new solver are demonstrated in the verification of the secondary flow model in the curved pipeline.Finally,the numerical study of the rotor-stator interaction phenomenon of the centrifugal pump was carried out using the new solver.The numerical simulation results show that the modified equation of fluid motion can capture the rotor-stator interaction phenomenon in the internal flow of the centrifugal pump well enough,meanwhile this phenomenon can be analyzed effectively,which proves the feasibility of applying the modified equation into the numerical simulation of complex engineering flow.In addition,the advantages of Open FOAM in compiling and applicability are also demonstrated in the specific code editing process.