Numerical Simulation Of Hydrodynamic Change Of Uniform Fluid Based On Submerged Point Source Distribution

In this thesis,based on the numerical method of desingularity of Green’s function with dissipative sources,the physical model of multipoint sources is established,and the two-dimensional and three-dimensional hydrodynamic changes of uniform fluid based on the distribution of submerged point sources are studied.The free surface wave elevation of multipoint sources is numerically simulated,and the change law between wave bodies is studied in the complex internal flow field changes formed by the coupling of point sources,water depth,flow field and intensity.The following is the main work of this thesis:(1)Based on the source Green’s function,a physical model of the submerged point source is constructed in a two-dimensional uniform flow,and the free surface wave elevation of double point sources with horizontal inclined distribution is numerically simulated.The wave elevation on the free surface is studied with different point source position,submerged depth and dissipative coefficients.Also the influence of wave variation and decreasing amplitude with horizontal and oblique distribution is studied in detail.(2)Based on the numerical method of desingularity of Green’s function with dissipative source,the physical model of three dimensional uniform flow submerged point source is proposed,and the free surface wave under the special distribution of multipoint sources is numerically simulated.The longitudinal distribution sources is located at the fluid,and the free surface presents a large trough profile when the fluid pass double sources.Under the large Froude number,the trough profile expands along the fluid direction and the relative position moves forward.When point sources are distributed obliquely,the transverse wave and scattered waves interfere and overlap each other.With the evolution of the distance away from the point source,the free surface wave propagates with the single-sided scattered waves profiles.The bilateral symmetrical scattered waves,and superimposed transverse wave are scattered Respectively.In the case of multipoint sources distribution,the complex contours of the wave profile with the circle distribution source are concentrated in the central area.The shear wave and the scattered waves are staggered gradually and separate along the fluid direction.The similar periodic changes and standing waves are presented in this fluid domain.