Wind and Structures

  • 제38권4호
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  • Pages.261-275
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  • 2024
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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A compensation method for the scaling effects in the simulation of a downburst-generated wind-wave field

  • Haiwei Xu (College of Civil Engineering and Architecture, Zhejiang University) ;
  • Tong Zheng (College of Civil Engineering and Architecture, Zhejiang University) ;
  • Yong Chen (College of Civil Engineering and Architecture, Zhejiang University) ;
  • Wenjuan Lou (College of Civil Engineering and Architecture, Zhejiang University) ;
  • Guohui Shen (College of Civil Engineering and Architecture, Zhejiang University)
  • 투고 : 2023.06.29
  • 심사 : 2024.01.23
  • 발행 : 2024.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

Before performing an experimental study on the downburst-generated wave, it is necessary to examine the scale effects and corresponding corrections or compensations. Analysis of similarity is conducted to conclude the non-dimensional force ratios that account for the dynamic similarity in the interaction of downburst with wave between the prototype and the scale model, along with the corresponding scale factors. The fractional volume of fluid (VOF) method in association with the impinging jet model is employed to explore the characteristics of the downburst-generated wave numerically, and the validity of the proposed scaling method is verified. The study shows that the location of the maximum radial wind velocity in a downburst-wave field is a little higher than that identified in a downburst over the land, which might be attributed to the presence of the wave which changes the roughness of the underlying surface of the downburst. The impinging airflow would generate a concavity in the free surface of the water around the stagnation point of the downburst, with a diameter of about two times the jet diameter (Djet). The maximum wave height appears at the location of 1.5Djet from the stagnation point. Reynolds number has an insignificant influence on the scale effects, in accordance with the numerical investigation of the 30 scale models with the Reynolds number varying from 3.85 × 104 to 7.30 × 109. The ratio of the inertial force of air to the gravitational force of water, which is denoted by G, is found to be the most significant factor that would affect the interaction of downburst with wave. For the correction or compensation of the scale effects, fitting curves for the measures of the downburst-wave field (e.g., wind profile, significant wave height), along with the corresponding equations, are presented as a function of the parameter G.

키워드

과제정보

The authors would like to acknowledge the financial support of National Natural Science Foundation of China (51878607, 51838012, and 51978614).

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