CFX simulations were performed by solving steady compressible Reynolds-averaged N-S equations in conjunction with the standard k-w two-equation turbulence model adopted in this study. The blade calculated was a rotor blade in a gas turbine. The numerical simulation was performed to investigate the effects of arcing endwall contouring on blade aerodynamic performances and tip leakage flow. The results show that the arcing endwall contouring can weaken passage vortex and tip leakage vortex,improve the flow an...