Abstract: Three-dimensional hydraulic characteristics of spur dikes in a 60° channel bend were simulated numerically using a gas-liquid two-phase flow model and an RNG k-ε turbulence model (FLUENT 6.3), along with the VOF method for free surface tracking and the SIMPLE algorithm for solving the governing equations on a finite-volume discretization framework. Calculated distributions of velocity and water level in the bend show a good agreement with previous experimental data. This two-phase flow model was applied to simulations of the flows around a set of three T-shape spur dikes located at the concave side of a 60° channel bend. Comparison with straight spur dikes indicates that the T-shape spur dikes have advantages in reducing transverse surface slope, improving flow patterns, and suppressing flow circulations behind the spur dikes.