| dc.description.abstract | This master thesis is to investigate the drag forces on net panels with different twine diameter,
material, solidity ratio, and Reynolds number. A series of net panel towing tests has been carried
out. Resistance force on the net panel was measured. The nets have been tested in current only
condition, wave only condition and current with wave condition with a representative range of
current velocity, wave period and wave steepness. Error and uncertainty in the net panel towing
test are analyzed in detail. Numerical simulations were implemented. The numerical simulation
in this thesis is realized in the framework of the open source computational fluid dynamics
toolbox OpenFOAM with version 4.1. The porous media model was proposed to solve the flow
characteristics through and around a net panel. A variety of net panels with different solidity
ratio from experiments are applied in the validation case. The porous resistance force was obtained
fromnumerical simulation to comparewith the drag force in current only condition from
experiments. Satisfactory agreement between simulations and experiments was demonstrated. | |
