Volume 49 Issue 9
Oct.  2023
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XU Y T,TAN D L,YANG C. Study on tail-slap load characteristics of high-speed projectile based on CFD/CSD coupling[J]. Journal of Beijing University of Aeronautics and Astronautics,2023,49(9):2539-2546 (in Chinese)
Citation: XU Y T,TAN D L,YANG C. Study on tail-slap load characteristics of high-speed projectile based on CFD/CSD coupling[J]. Journal of Beijing University of Aeronautics and Astronautics,2023,49(9):2539-2546 (in Chinese)

Study on tail-slap load characteristics of high-speed projectile based on CFD/CSD coupling

doi: 10.13700/j.bh.1001-5965.2022.0939
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  • Corresponding author: E-mail:yangchao@buaa.edu.cn
  • Received Date: 24 Nov 2022
  • Accepted Date: 26 Feb 2023
  • Available Online: 07 Apr 2023
  • Publish Date: 03 Apr 2023
  • A calculating approach based on the two-way analysis of computational fluid dynamics (CFD)/computational structure dynamics (CSD) coupling is devised to increase the predictability of the projectile’s tail-slap load. The main governing equation of fluid calculation adopts the Navier-Stokes equation with SST k-ω turbulent flow model and Schnerr-Sauer cavitation model, structural calculations use simplified structural dynamic equations based on the modal superposition method, interpolation of fluid-structural coupling interface using radial basis function method, mesh deformation using spring stretching method. Both the fluid-structural coupling approach and the cavity shape computation method were independently verified. Further, the differences in cavity shape, structural deformation, and characteristics of tail-slap loads between the rigid body and the elastic body of the projectile at a speed of 1000 m/s were calculated and compared. Simulation results show that during the tail-slapping process of the elastic body, the cavity shape of the projectile will produce special phenomena such as ‘secondary slap’, ‘partial wetting’ and a wetting area increased. Structural deformation is dominated by the first-bending mode. The larger deformation causes the dynamic load to increase by 27%~105%, the amplitude of the pitch angle to increase by 13%, and the tail-slapping frequency to increase by 20%. The fluid-structural coupling effect has a strong influence on the cavity shape, loads, and ballistic of tail-slapping.

     

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