NUMERICAL CALCULATION OF SUSPENDED SEDIMENTS OVER SANDWAVES

Abstract

In order to understand the flow structure over sandwaves, 2-dimesional and 3-dimensional flow models are tested under the flow condition of flow over 2-dimensional sandwaves. CIP (Cubic Interpolated Psuedo-particle) method was introduced to evaluate the computational result with high accuracy. Computational results are compared with the velocity obtained by experiment. It was found that 3-dimensional turbulent structure is dominant even in the flow over 2-dimensional sandwaves. Direct numerical simulation of suspended sediment particle is conducted using data obtained by 2-dimensional and 3-dimensional flow model. A good agreement with theoretical profile is found only for 3-dimensional model. It is suggested that 3-dimensional treatment is required in calculating suspended sediment.