Studies on the hydrodynamics of a square near the wall

A numerical study is performed to investigate the hydrodynamics of a square near the wall. The fluid dynamics around this bluff body is considered at the Reynolds number Re ≈ 100. The numerical results show that the time-varying force on the square would keep static when the gap between the square and wall is smaller, while it varyingly changes at higher gap. Moreover, the time-mean drag on the square firstly increases and then decreases with keeping increase of the gap between the square and wall, while the time-mean lift on the square gradually decreases. This finding may be helpful for designing the offshore structure in a varied oceanic topography.