Flow induced motion of an elastically mounted trapezoid cylinder with different rear edges at high Reynolds numbers
作者： Xinru Mao , Li Zhang , Dejiang Hu , Lin Ding
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摘要: The flow induced motion (FIM) of an elastically mounted trapezoid cylinder with different body shapes is numerically studied by solving two-dimensional unsteady Reynolds-averaged Navier–Stokes equations. on end-supporting linear springs constrained to oscillate normal the direction and axis cylinder. Numerical simulations were performed in Reynolds number(Re) range from 10 000 120 000. ratio rear front edge width cylinder, λ, varies zero one. Both vortex-induced vibrations (VIV) galloping are observed for tested cases. VIV upper branch λ = 0.8 square (λ 1) clearly amplitude frequency responses. Galloping exhibited when Re ≥ 90 FIM responses obviously weaker than triangle cylinders, since interaction between separated shear layers lower sides becomes weak as increases. maximum value achieved at 4.51D (D cylinder) 0.6 22.21 (Re 000), where U/(f n,water D) f natural oscillatory system water. Up 18 vortices branch. displacement trend matches well lift forces, especially
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