Numerical Simulation Of Hydrodynamic Interactions On A Body Moving Near Wall In Viscous Flows

At present, there is lack of understanding about that how to change of the hydrodynamic forces on a body moving near wall in water. In this field, neither potential flow theory nor computational fluid dynamics based on viscidity theory has ripe and available documented materials or experience. A large number of exploratory studies on basic understanding, theory and experiment need to do.Under the environment that CFD technology be great vigorous, the commercial CFD software FLUENT may be a good tool for the modeling of the two-body hydrodynamic interactions. Firstly, the two-dimensional steady viscous flow field around the body of Rankine shape moving near plane wall with different gaps and different attack angles is simulated based on the finite volume method, non-structural mesh grid approach and wall function. The details of the viscous flow field including the velocity, pressure distribution and forces have been given in this thesis.Secondly, model experiment of testing the hydrodynamic forces on the 2-D Rankine body has been carried out. The numerical viscous hydrodynamic forces, including the longitudinal drag, side force and pitch moment, have been compared with the data of model experiment and of the numerical results based on the potential flow theory. The principle of changing is expounded about the hydrodynamic forces of body moving near wall in this paper. The author analyzed the reason which produce the phenomenon, and drew some relevant conclusions.Lastly, base on the experience from the calculation on two-dimension flow, the hydrodynamic forces of a three dimensional diving device which is moving near the flat wall and near a submarine bow is calculated and the comparison with some other test data and potential flow results. The studies prove that the present method is feasible for the 3-D interaction flow as well.