URANS-Based Prediction of Vortex Induced Vibrations of Circular Cylinders


DOBRUCALI E., Kinaci O. K.

JOURNAL OF APPLIED FLUID MECHANICS, cilt.10, sa.3, ss.957-970, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 10 Sayı: 3
  • Basım Tarihi: 2017
  • Doi Numarası: 10.18869/acadpub.jafm.73.238.27339
  • Dergi Adı: JOURNAL OF APPLIED FLUID MECHANICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.957-970
  • Anahtar Kelimeler: VIV, Flow around cylinder, Reduced velocity, Oscillation frequency, Spring stiffness, INTERFERENCE-INDUCED OSCILLATIONS, LOW-MASS, NUMERICAL-SIMULATION, FLOW, CONVERTER, MOTIONS, SURFACE, TANDEM, VIV
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

Vortex induced vibrations (VIV) are highly nonlinear due to three different frequencies involved in the process; fluid force frequency, vortex shedding frequency and oscillation frequency. It is computationally complex to solve such a chaotic fluid flow but recent progress in numerical algorithms, turbulence models and computer capabilities have made it easier to approach the problem with a nonlinear approach. These developments have paved the way to approach the problem with the simple equation of motion of Newton's law and when coupled with URANS, which is a commonly used method in solving problems related to fluid flow, the highly nonlinear problem of vortex induced vibrations become solvable. The existing literature computationally can only handle flows for Re > 10,000 - 12,000 but the numerical methodology adopted in this study furthers this limitation. The numerical algorithm is first tried for a stationary cylinder and the boundary layer separation is investigated for higher Re . The generated results are found to be satisfactory to proceed solving for VIV at high Re . The solution strategy is tested in a wide range of Reynolds number with different springs and damping coefficients. Satisfactory agreement is found with the experiments for a cylinder in VIV. The shortcomings of the computational work and why these limitations arise are tried to be explained using the experimental results and the existing mathematical models.