scholarly journals HARBOR AGITATION DUE TO OFFSHORE SHIP WAVES USING SWASH: A CASE STUDY OF KUMKAPI YACHT PARK, ISTANBUL

2018 ◽  
pp. 12
Author(s):  
Cüneyt Baykal ◽  
Gülizar Özyurt TarakcıoÄŸlu ◽  
Emrecan Işık
Keyword(s):  
Numerical Modeling ◽  
Free Surface ◽  
Numerical Model ◽  
Coastal Waters ◽  
Rotational Flow ◽  
Ship Waves ◽  
Safety Requirements ◽  
Flow And Transport ◽  
Bosphorus Strait

This study presents the results of a numerical modeling study on the harbor agitation in case of offshore ship waves using SWASH (acronym for Simulating WAves till SHore), a numerical model developed for the simulating unsteady, non-hydrostatic, free-surface, rotational flow and transport phenomena in coastal waters as driven by waves, tides, buoyancy and wind forces (Zijlema et al. 2011). The study area is the Kumkapi Yacht Park, at the Marmara coast of Istanbul, 2.5 km west of the southern entrance of Bosphorus strait. The yacht park is currently used as a fishery harbor, which is severely affected by the ship waves of ferries and sea buses passing nearby almost parallel to the main breakwater of the harbor (aligned from west to east). The park is planned to berth a total of 140 yachts varying from 5 m to 40 m in length (Figure 1). For this purpose, the present harbor layout together with several alternative plans have been studied numerically to investigate agitation due to ship waves of ferries and sea buses considering the design safety requirements of ASCE (2012) for the safe mooring and berthing of yachts.

scholarly journals WAVES GENERATED BY TWO OR MORE SHIPS IN A CHANNEL

2011 ◽  
Vol 1 (32) ◽  
pp. 60 ◽  
Author(s):  
Maria Francisca Nascimento ◽  
Claudio Freitas Neves ◽  
Geraldo De Freitas Maciel
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Surface Pattern ◽  
Ship Waves ◽  
Wave Trains

The numerical model FUNWAVE+Ship simulates the generation and propagation of ship waves to shore, including phenomena such as refraction, diffraction, currents and breaking of waves. The interaction of two wave trains, generated by ships moving either in the same direction at different speeds or in opposite directions, is studied. Focus is given to the wave orbital velocities and to the free surface pattern.

3D Numerical Modeling of Stratified Flows: Case Study of the Bosphorus Strait

2012 ◽  
Vol 138 (5) ◽  
pp. 406-419 ◽  
Author(s):  
Mehmet Öztürk ◽  
Berna Ayat ◽  
Burak Aydoğan ◽  
Yalçın Yüksel
Keyword(s):  
Numerical Modeling ◽  
Stratified Flows ◽  
3D Numerical Modeling ◽  
Bosphorus Strait

scholarly journals NUMERICAL MODELING OF MORPHODYNAMIC CHANGES IN THE JADE ESTUARY – GERMANY

2011 ◽  
Vol 1 (32) ◽  
pp. 84 ◽  
Author(s):  
Almut Gelfort ◽  
Florian Ladage ◽  
Oliver Stoschek
Keyword(s):  
Numerical Modeling ◽  
Sediment Transport ◽  
Numerical Model ◽  
Input Data ◽  
Set Up

Based on a case study sediment transport was modeled numerically for the Jade estuary. Due to the construction of the JadeWeserPort the morphology in the area is undergoing a relocation. The study gives an overview on various studies undertaken as a consultant tool to help designers and decisions makers. A hydrodynamic as well as a morphodynamic numerical model was set up. Although the input data on the morphodynamic part was limited, the results showed that the tool at hand is capable of producing reliable results in the field of modeling sediment transport.

scholarly journals Numerical Modeling of Coupled Surge-Heave Sloshing in a Rectangular Tank with Baffles

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Lv Ren ◽  
Yinjie Zou ◽  
Jinbo Tang ◽  
Xin Jin ◽  
Dengsong Li ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Free Surface ◽  
Numerical Model ◽  
Frequency Response ◽  
Navier Stokes ◽  
Rectangular Tank ◽  
Vertical Baffle ◽  
Tank Bottom ◽  
Violent Sloshing ◽  
Effective Water

Liquid sloshing under coupled surge and heave excitations in a rectangular tank has been numerically investigated by applying a Navier–Stokes solver. Fieriest coupled sloshing was further considered, and the internal baffle was expected to suppress the violent sloshing wave. After getting fully validated against available results from the literatures, the numerical model was applied to research coupled sloshing, and both vertical baffle and horizontal baffle have been considered. Due to the strong vortexes created by the sharper corners of the baffles and the reduction of the effective water bulk climbing through the tank walls, the sloshing was dramatically reduced. The increase of the baffle distance away from the tank bottom led to a decrease in the sloshing wave. It was noted that the baffle near the free surface caused the maximal dissipation. The frequency response of the sloshing wave was accordingly illustrated.

The Numerical Modeling of Ship Motions and Capsizing in Severe Seas

1990 ◽  
Vol 34 (04) ◽  
pp. 289-301
Author(s):  
Jan O. de Kat
Keyword(s):  
Numerical Modeling ◽  
Free Surface ◽  
Numerical Model ◽  
Nonlinear Model ◽  
Time Domain ◽  
Ship Motions ◽  
First Order ◽  
Large Amplitude Motions ◽  
Flow Effects ◽  
The Time Domain

A numerical model has been developed to determine the large-amplitude motions of a steered vessel subjected to severe wave conditions, including those that may lead to capsizing. The model was used to identify different modes of capsizing, and to study relevant mechanisms and conditions. In this paper emphasis is placed on the theoretical aspects. The nonlinear model combines both potential and viscous flow effects, where integrations are carried out in the time domain over the instantaneous free surface; first-order memory effects are taken into account, and the free surface can be irregular, Some new results are presented concerning statistical properties relevant to the simulation of random following or quartering seas.

Solidifying Mud Cake to Improve Cementing Quality of Shale Gas Well: A Case Study

2015 ◽  
Vol 8 (1) ◽  
pp. 149-154 ◽  
Author(s):  
Jun Gu ◽  
Ju Huang ◽  
Su Zhang ◽  
Xinzhong Hu ◽  
Hangxiang Gao ◽  
...  
Keyword(s):  
Shale Gas ◽  
Calcium Silicate Hydrate ◽  
Drilling Fluid ◽  
Cement Slurry ◽  
Gas Well ◽  
Safety Requirements ◽  
Mud Cake ◽  
Gas Bearing

The purpose of this study is to improve the cementing quality of shale gas well by mud cake solidification, as well as to provide the better annular isolation for its hydraulic fracturing development. Based on the self-established experimental method and API RP 10, the effects of mud cake solidifiers on the shear strength at cement-interlayer interface (SSCFI) were evaluated. After curing for 3, 7, 15 and 30 days, SSCFI was remarkably improved by 629.03%, 222.37%, 241.43% and 273.33%, respectively, compared with the original technology. Moreover, the compatibility among the mud cake solidifier, cement slurry, drilling fluid and prepad fluid meets the safety requirements for cementing operation. An application example in a shale gas well (Yuanye HF-1) was also presented. The high quality ratio of cementing quality is 93.49% of the whole well section, while the unqualified ratio of adjacent well (Yuanba 9) is 84.46%. Moreover, the cementing quality of six gas-bearing reservoirs is high. This paper also discussed the mechanism of mud cake solidification. The reactions among H3AlO42- and H3SiO4- from alkali-dissolved reaction, Na+ and H3SiO4- in the mud cake solidifiers, and Ca2+ and OH- from cement slurry form the natrolite and calcium silicate hydrate (C-S-H) with different silicate-calcium ratio. Based on these, SSCFI and cementing quality were improved.

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