IJE TRANSACTIONS B: Applications Vol. 31, No. 2 (February 2018) 212-219   

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M. Feizbahr, C. Kok Keong, F. Rostami and M. Shahrokhi
( Received: July 06, 2017 – Accepted in Revised Form: October 12, 2017 )

Abstract    The indispensable vital structure in any harbor is a breakwater in order to make available calm water region inshore. Pile breakwater can be employed as a small coastal protection structure where tranquility required is low. This study is concerned with CFD study on the performance of perforated hollow pile to dissipate wave energy and the novelty of this investigation is the role of perforation layout in dissipating energy of water. Pile models under two different incident waves with constant water depth and wave amplitude have been classified into two groups with two different wavelengths, making a total of 10 models which has been simulated numerically by computational flow solver FLOW 3D. The analytical results of simulations show changes in the velocity profiles after piles while dissipation happened in the vicinity of the pile. The result implied the perforated models can perform better than the non-perforated ones and energy dissipation was found much more significant in perforated piles.


Keywords    breakwater, perforation, hollow piles, Flow 3D, wave modeling, coastal-protection


چکیده    یکی از سازه های حیاتی برای آرام نگاه داشتن ساحل بنادر موج شکن است . موج شکن شمعی می تواند به عنوان سازه‌ی محافظ برای سواحلی که دارای امواج آرام هستند استفاده شود . این تحقیق به بررسی عددی اتلاف انرژی توسط موج شکن های شمعی سوراخ دار و بدون سوراخ به ویژه آرایش هندسی سوراخ ها در اتلاف موج پرداخته است . مدل های شمع تحت با عمق آب و دامنه موج ثابت در دو گروه با دو طول موج مختلف طبقه بندی شده اند. و به طور کلی تعداد ۱۰ مدل توسط نرم افزار FLOW 3D شبیه سازی گردید. نتایج تحلیل های انجام شده نشان می دهد که اتلاف انرژی بعد از شمع ها و در نزدیکی شمع اتفاق افتاده است. نتایج همچنین نشان می دهد که مدل های سوراخ دار اتلاف انرژی بهتری را نسبت به مدل شاهد بدون سوراخ داشتند.


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