Wave-induced response of a floating two-dimensional body with a moonpool.

نویسندگان

  • Arnt G Fredriksen
  • Trygve Kristiansen
  • Odd M Faltinsen
چکیده

Regular wave-induced behaviour of a floating stationary two-dimensional body with a moonpool is studied. The focus is on resonant piston-mode motion in the moonpool and rigid-body motions. Dedicated two-dimensional experiments have been performed. Two numerical hybrid methods, which have previously been applied to related problems, are further developed. Both numerical methods couple potential and viscous flow. The semi-nonlinear hybrid method uses linear free-surface and body-boundary conditions. The other one uses fully nonlinear free-surface and body-boundary conditions. The harmonic polynomial cell method solves the Laplace equation in the potential flow domain, while the finite volume method solves the Navier-Stokes equations in the viscous flow domain near the body. Results from the two codes are compared with the experimental data. The nonlinear hybrid method compares well with the data, while certain discrepancies are observed for the semi-nonlinear method. In particular, the roll motion is over-predicted by the semi-nonlinear hybrid method. Error sources in the semi-nonlinear hybrid method are discussed. The moonpool strongly affects heave motions in a frequency range around the piston-mode resonance frequency of the moonpool. No resonant water motions occur in the moonpool at the piston-mode resonance frequency. Instead large moonpool motions occur at a heave natural frequency associated with small damping near the piston-mode resonance frequency.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

حل تحلیلی امواج سطحی تولید شده در اثر حرکت اجسام غوطه ور

Analytical analysis of a two-dimensional submerged body moving with a constant velocity in an inviscid incompressible fluid under gravity near a free surface is studied in this paper. This notion is one of the fundamental concepts in applied hydrodynamics. Experimental observations of water waves in large scale or laboratory observation in open channels is indicative of complex phenomenons taki...

متن کامل

Investigation of the effect of geometry float body on the power of wave energy absorber converter using mooring catenary

This paper presents the effect of hydrodynamic parameters of the two-body converters of a point wave absorber on the amount of power output. This converter includes two submerged and floating bodies which are connected to the spring-damper system. The whole of the converter is connected to the sea bed by mooring catenary. The relative displacement of the floating body and the submerged body is ...

متن کامل

Investigating the effect of using a Lateral duct in the body of a floating breakwater by numerical method

Floating breakwaters are good alternative to the so-called fixed base breakwaters, which, in addition to having the main purpose of protecting the beach from waves, also maintain the water connection between the sea and the protected area. Researchers in order to increase the efficiency and increase the performance range of floating breakwaters, have done many researches on their effective para...

متن کامل

Numerical Solution of Seismic Wave Propagation Equation in Uniform Soil on Bed Rock with Weighted Residual Method

To evaluate the earth seismic response due to earthquake effects, ground response analyses are used to predict ground surface motions for development of design response spectra, to compute dynamic stresses and strains for evaluation of liquefaction hazards, and to determine the earthquake induced forces that can lead to instability of earth and earth-retaining structures. Most of the analytical...

متن کامل

Optimal Resistive Control Strategy for a Floating OWC Device

A resistive control strategy to optimize pneumatic power for a floating OWC device is presented. This strategy utilizes a linear, frequency-domain performance model that links an oscillating structure to air-pressure fluctuations with a Wells Turbine in 3-dimensions. An array of field points defining the interior free surface allows hydrodynamic parameters relating to the fluctuating air-pressu...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

دوره 373 2033  شماره 

صفحات  -

تاریخ انتشار 2015