Characterization and cfd analysis of some traditional vessels of kerala

Abstract

The solution of problems involving determination of resistances using newlineComputational Fluid Dynamics (CFD) analysis is now becoming tractable due to newlineimproved accessibility to high-performance computing. Determination of the resistance newlinecharacteristics of vessels is one of the most important topics in Naval Architecture, and newlineOffshore and Ocean Engineering. Many CFD tools are being used in the design of the newlinehull forms of vessels. This thesis deals with the characterization and CFD analysis of newlinethree traditional vessels of Kerala, namely, Snake Boat, Uru, and House Boat. newlineData pertaining to these vessels including the dimensions required to model its newlinegeometry were collected by performing an elaborate field survey. Three dimensional newlinedrawings of these vessels were developed in AutoCAD using the data collected from newlinethis survey. NURBS surfaces and offset files to perform the analysis were generated newlineusing MAXSURF-16. These files were converted into IGES files using Rhinoceros 6.0. newlineHydrodynamic analysis was performed using the commercial CFD software package newlineSHIPFLOW 5.1®. The RANS (Reynolds-averaged Navier-Stokes) equations were newlinesolved using the Finite Volume Method. Time averaged velocity and pressure contours newlinewere obtained. Grid sensitivity studies were also performed. newlineHydrostatic analysis, lines plan, area and volume calculations were performed for newlinethe three vessels. The allowable drafts and speeds of these vessels were arrived at based newlineon the wave cuts obtained for the range of Froude numbers investigated.The wave newlinemaking, frictional and total drag coefficients and drag forces at different Froude newlinenumbers for steady turbulent flow were estimated through simulations. Velocity vectors newlineas well as contours of pressure distribution on these hull surfaces were plotted. newline