Scale effect on the wake field of a single screw ship

Abstract

Nowdays, the CFD method has been become a famous approach that use to solve the problem involved the ship hydrodynamic problems. The objective of this master thesis is attempting to simulate a single screw stern ship sailing in the calm water with several different ship speed with the help of CFD program Star CCM+. Simulations contain both model scale situations and full scale situations. By analysis the results of the ship resistance coefficient and wake field of both cases, we figure out that the resistance and wake differences between model scale ship and full scale ship and what caused the scale effect between the real full scale ship and the model scale ship. Master thesis mainly consist of four parts: background and methods, which is use to define the basic theoretical foundation of this thesis; Case study part introduces the model, mesh and physical parameters setting process in the CFD computer program: Star CCM+; Results part shows the results from simulations we get and Discussion part discuss the questions we encounter during the simulation. The entire simulation process in this thesis contains five phases: 1. Setup simulated models and meshes; 2. Setup physical parameters; 3. Verification of results; 4. Simulate all the test cases; 5. Analyze the results.