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Direct Numerical Simulation coupled with Immersed Boundary Method (IBM) has attracted wide attention recent years, making this technique a significant role in many practical engineering areas. This paper described a direct numerical study of flow past a sphere above a plane, which can obtain detail information of flow field and vortex structure. A combined multiple-direct forcing and immersed boundary method (MDF/IBM) was used to deal with the coupling between fluid and solid. The Reynolds number based on sphere diameter was 4171. Behaviours of the vortices were observed through the simulation. The velocity distribution switched from laminar boundary to turbulent boundary. A recirculation region was observed behind the sphere. The influence of the sphere on the boundary layer, the center peak defect, the turbulence intensity and the Reynolds stresses are explored.

Direct Numerical Simulation of Flow Past a Sphere in a Plane Turbulent Boundary Layer with Immersed Boundary Method