Parallel Computation And Analysis Of Rotating Fluids

Rotating fluid is a special fluid with a wide range of applications in the high-end manufacturing,environmental engineering,aerospace and medical devices.Common applications include wind turbines,mixers,artificial heart pumps and aeroengines.The high-fidelity numerical simulation of rotating fluids is challenging due to the simultaneous involvement of turbulence,relative motion,and moving mesh techniques.In this paper,the solution algorithms,turbulence models and rotation calculation methods of rotating fluid mechanics are investigated in detail.The accuracy of different solution algorithms is explored through a variety of rotating fluid mechanics calculations in different applications,the vortex resolution of different turbulence models for rotating fluids is compared,and the parallel efficiency of multiple solution algorithms for largescale problems is studied in detail.In this paper,we first investigated the high-performance numerical simulation algorithms for rotating fluid mechanics.Based on the general N-S equations,the solution algorithms are studied in detail for different rotational fluids,including PISO,PIMPLE and SIMPLE algorithms;different turbulence models for turbulence calculations are studied;two rotation methods for rotating fluid calculations are investigated,including the multiple reference frame method for steady-state simulations and the arbitrary mesh interface method for transient simulations.In order to verify the accuracy of the algorithms,two benchmark cases are calculated in detail.And then,we studied the aerodynamics of a two-rotor vertical wind turbine using the developed high-performance algorithm.The calculation explores in detail the ability of multiple RANS and LES turbulence models to capture turbulent eddies,and provides a detailed analysis of the accuracy of turbulent eddy capture for three turbulence sub-models under the RANS method.In addition,the parallel scalability and efficiency of each turbulence model and the arbitrary mesh interface method are investigated in detail.Numerical results show that the arbitrary mesh interface method becomes the bottleneck of the parallel efficiency as the number of processors increases,and the parallel efficiency of different turbulence models also varies significantly.We finally applies the high-performance solution algorithm to the optimal design of a specific industrial product—the hydrodynamic optimization design of an artificial heart pump.Using the above algorithm,the rotor geometry of the artificial heart pump is designed optimally through a large number of hydrodynamic simulations.The comprehensive mechanical performance of the optimized model is greatly improved compared with the original model,in which the flow rate is improved by 36The main innovations of this paper are:（1）we developed a high-fidelity fast simulation system for the rotational fluid dynamics simulation,and the high-performance numerical simulation algorithm for rotational fluid dynamics was studied in detail,and the accuracy of the algorithm was verified using benchmark cases;（2）using the algorithm,a detailed aerodynamic calculation and analysis of a multi-rotor vertical axis wind turbine was studied,and the shape of an artificial heart pump was optimized based on a large number of hydrodynamic simulations.