摘要
Through the numerical simulation investigation,the turbulent drag reduction mechanisms of shark riblet surface are explored. In allusion to the characteristics of riblets surface,the computation region,grids and flow parameters are dealt with reasonably. These present simulation results show preliminarily that 1) only the near-wall flow field above riblet surfaces is affected by riblets,and the flow within riblets is slow and quiescent; 2) the viscous sub-layer above riblet surface is thicker; 3) the shear stress and the local friction coefficient above the riblet surface are reduced,and the drag reduction quantity is larger at the bottom of riblets than that at the top. Numerical simulation investigation on the riblet surface in the paper can provide a reference for future research in this field.
Through the numerical simulation investigation, the turbulent drag reduction mechanisms of shark riblet surface are explored. In allusion to the characteristics of riblets surface, the computation region, grids and flow parameters are dealt with reasonably. These present simulation results show preliminarily that 1） only the near-wall flow field above riblet surfaces is affected by riblets, and the flow within riblets is slow and quiescent; 2） the viscous sub-layer above riblet surface is thicker; 3） the shear stress and the local friction coefficient above the riblet surface are reduced, and the drag reduction quantity is larger at the bottom of riblets than that at the top. Numerical simulation investigation on the riblet surface in the paper can provide a reference for future research in this field.
基金
Sponsored by National Nature Science Foundation of China (10672136,50835009)
Science and Technology Innovation Foundation of NWPU(2008KJ02012)
