IJE TRANSACTIONS B: Applications Vol. 29, No. 2 (February 2016) 236-245    Article Under Final Proof

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M. Bakhtiari, S. Veysi and H. Ghassemi
( Received: November 10, 2015 – Accepted: January 26, 2016 )

Abstract    This article describes a 3D CFD (computational fluid dynamics) simulation implementation of the stepped planning hull in calm water. The turbulent free surface flow around the stepped planing hull is computed with a RANSE method, using the solver ANSYS-CFX. The turbulence model used is standard k–ε. In order to simulate the disturbed free surface, VOF model is implemented. The CFD model has been firstly validated using the available experimental data. The numerical results of drag, pressure distribution, wetted surface, water spray, wake profile and wave generated by the planing hull are presented and discussed at various speeds. Wake profiles calculated from present model are also compared with the ones calculated from Savitsky’s emprical equations at different speeds.


Keywords    Stepped hull; Turbulent free surface flow; VOF model; Drag; Wake profile


چکیده    در این مقاله، کاربرد یک شبیه سازی دینامیک سیالات محاسباتی سه بعدی برای یک شناور پلنینگ استپ دار توصیف می شود. جریان مغشوش سطح آزاد اطراف شناور پلنینگ استپ دار به روش RANS، با استفاده از حلگر ANSYS-CFX محاسبه می شود. مدل اغتشاشی بکارگرفته شده، مدل Standard k–ε است. به منظور شبیه سازی سطح آزاد مغشوش شده، از مدل حجم سیال (VOF) استفاده می شود. مدل CFD حاضر در ابتدا با استفاده از نتایج آزمایشگاهی اعتبار سنجی شده است. نتایج عددی بدست آمده برای درگ، توزیع فشار، سطح خیس، اسپری آب، پروفیل ویک و موج ایجاد شده توسط بدنه شناور در سرعت های مختلف ارائه و مورد بحث قرار می گیرند. همچنین پروفیل های ویک محاسبه شده توسط مدل حاضر، با پروفیل های محاسبه شده توسط معادلات تجربی Savitsky مقایسه می شوند.



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