Calculation of Trajectory of High-speed Spinning Projectile Based on Computational Fluid Dynamics/Rigid Body Dynamics Coupling

doi:10.3969/j.issn.1000-1093.2020.06.005

Abstract

Abstract: To study the real flight trajectory of high-speed spinning projectile, a computational fluid dynamics/rigid body dynamics (CFD/RBD) couping computational methodology is developed using improved simple low-dissipation advection upstream splitting method (SLAU2), dual time-stepping method and Spalart-Allmaras (S-A) turbulence model based on the ideas of adding the motion of projectile axis to the surfaces of control volumes and adding the spin motion to the wall boundary. A flow model with ALE form is established. An arbitrary Lagrangian-Eulerian (ALE) flow model is established. A coupled mathematical model of the projectile motion and the surfaces of control volume motion is developed, and the simultaneous calculation of flow equations and trajectory equations based on 4th order Runge-Kutta method is achieved. The research results show that the aerodynamic coupling method and time step have great influence on the trajectory coupling calculation results. The trajectory of M549 spinning projectile at 0.5 ms timesteps was simulated using the tighting coupling method. The simulated results are basically consistent with the results calculated by the aerodynamic model. The trajectory simulation result of a spin stabilized two-dimensional trajectory correction projectile shows that the characteristic of that rising moment causes the projectile nose drop, which is consistent with the result in Ref. \[29\]. Key

Key words: high-speedspinningprojectile, computationalfluiddynamics, rigid-bodydynamics, trajectory, couplingcalculation

CLC Number:

TJ012.3⁺1

ZHONG Yang， WANG Liangming， WU Yingfeng. Calculation of Trajectory of High-speed Spinning Projectile Based on Computational Fluid Dynamics/Rigid Body Dynamics Coupling[J]. Acta Armamentarii, 2020, 41(6): 1085-1095.

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第41卷第6期2020 年6月
兵工学报ACTA ARMAMENTARII
Vol.41No.6Jun.2020

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