Xu, Cheng
Promotor(s) : Bronsart, Robert
Date of defense : 2016 • Permalink : http://hdl.handle.net/2268.2/6205
Details
Title : | Mesh Validation and Resistance Prediction of the JBC Bulker Design using CFD Method |
Author : | Xu, Cheng |
Date of defense : | 2016 |
Advisor(s) : | Bronsart, Robert |
Committee's member(s) : | Ferrant, Pierre |
Language : | English |
Number of pages : | 92 |
Discipline(s) : | Engineering, computing & technology > Civil engineering |
Target public : | Researchers Professionals of domain Student |
Institution(s) : | Université de Liège, Liège, Belgique |
Degree: | Master de spécialisation en construction navale |
Faculty: | Master thesis of the Faculté des Sciences appliquées |
Abstract
[en] In the preliminary stage of ship design, resistance prediction is a primary challenge for
designers. The objective of the thesis is to predict the total resistance and its components of
JBC bulker with the RANS method. As a mature approach, CFD is an effective tool to
estimate resistance. The well investigated hull form KVLCC2 is used to study the accuracy of
the CFD calculation and to validate the resistances and the flow field around the hull by
comparing it with existing experimental data.
Simulations are performed using the open source software package OpenFOAM. A steady
state RANS solver is used to solve the viscous flow around the hull and two-equation KOmega
SST model is selected for the turbulence modeling. The vessels are implemented in a
fixed towing condition where the effect of trim and sinkage is neglected. The commercial
mesher HEXPRESS is used to generate unstructured hexahedral meshes of the fluid domain.
Local grid refinements are carried out by setting the multi-block meshes and the free surface
is captured via VOF method. Additional refinement mesh is given in the boundary areas of
the hull and the wall function is implemented to simulate the turbulence characteristics.
A suitable value of turbulence intensity is obtained after a set of tests in order to get the right
turbulence parameters. In addition, the effect of grids with similar configuration is
investigated and 5-level gradual refinement meshes are studied. The resistance components
and the wave elevations in three different wave cuts are compared with the experimental
results, which show a good agreement. The most proper mesh configuration with good
accuracy is selected to convert to the JBC bulker.
At the end, the calculated resistances and three different transverse wave cuts of the bare hull
JBC bulker in calm water condition are presented.
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