Title of article :
Numerical Modeling of the Stepped Planing Hull in Calm Water
Author/Authors :
Bakhtiari, M. Department of Maritime Engineering - Amirkabir University of Technology, Tehran, Iran , Veysi, S. Department of Maritime Engineering - Amirkabir University of Technology, Tehran, Iran , Ghassemi, H. Department of Maritime Engineering - Amirkabir University of Technology, Tehran, Iran
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.
Farsi abstract :
ر اﯾﻦ ﻣﻘﺎﻟﻪ، ﮐﺎرﺑﺮد ﯾﮏ ﺷﺒﯿﻪ ﺳﺎزي دﯾﻨﺎﻣﯿﮏ ﺳﯿﺎﻻت ﻣﺤﺎﺳﺒﺎﺗﯽ ﺳﻪ ﺑﻌﺪي ﺑﺮاي ﯾﮏ ﺷﻨﺎور ﭘﻠﻨﯿﻨﮓ اﺳﺘﭗ دار ﺗﻮﺻﯿﻒ ﻣﯽﺷﻮد. ﺟﺮﯾﺎن ﻣﻐﺸﻮش ﺳﻄﺢ آزاد اﻃﺮاف ﺷﻨﺎور ﭘﻠﻨﯿﻨﮓ ا دار ﺑﻪ روش RANS ﺑﺎ اﺳﺘﻔﺎده از ﺣﻞﮔﺮ ANSYS-CFX ﻣﺤﺎﺳﺒﻪ ﻣﯽﺷﻮد. ﻣﺪل اﻏﺘﺸﺎﺷﯽ ﺑﻪ ﮐﺎر ﮔﺮﻓﺘﻪ ﺷﺪه، ﻣﺪل Standard k–ε اﺳﺖ . ﺑﻪ ﻣﻨﻈﻮر ﺷﺒﯿﻪ ﺳﺎزي ﺳﻄﺢ آزاد ﻣﻐﺸﻮش ﺷﺪه، از ﻣﺪل ﺣﺠﻢ ﺳﯿﺎل VOF اﺳﺘﻔﺎده ﻣﯽﺷﻮد. ﻣﺪل CFD ﺣﺎﺿﺮ در اﺑﺘﺪا ﺑﺎ اﺳﺘﻔﺎده از ﻧﺘﺎﯾﺞ آزﻣﺎﯾﺸﮕﺎﻫﯽ اﻋﺘﺒﺎر ﺳﻨﺠﯽ ﺷﺪه اﺳﺖ. ﻧﺘﺎﯾﺞ ﻋﺪدي ﺑﻪ دﺳﺖ آﻣﺪه ﺑﺮاي درگ، ﺗﻮزﯾﻊ ﻓﺸﺎر، ﺳﻄﺢ ﺧﯿﺲ، اﺳﭙﺮي آب، ﭘﺮوﻓﯿﻞ وﯾﮏ و ﻣﻮج اﯾﺠﺎد ﺷﺪه ﺗﻮﺳﻂ ﺑﺪﻧﻪ ﺷﻨﺎور در ﺳﺮﻋﺖ-ﻫﺎي ﻣﺨﺘﻠﻒ اراﺋﻪ و ﻣﻮرد ﺑﺤﺚ ﻗﺮار ﻣﯽﮔﯿﺮﻧﺪ. ﻫﻤﭽﻨﯿﻦ، ﭘﺮوﻓﯿﻞﻫﺎي وﯾﮏ ﻣﺤﺎﺳﺒﻪ ﺷﺪه ﺗﻮﺳﻂ ﻣﺪل ﺣﺎﺿﺮ، ﺑﺎ ﭘﺮوﻓﯿﻞﻫﺎي محاسبه شده توسط معادلات تجربي Savitsky مقايسه ميشوند.
Keywords :
Stepped Hull , Turbulent , Free Surface Flow , Volume of Fluid Model , Drag , Wake Profile
Journal title :
International Journal of Engineering
