Numerical investigation of flow field around T-shaped spur dyke in a reverse-meandering channel

Abstract

In this paper, the flow characteristics around T-shape spur dyke situated in the reverse meandering channel with a rigid bed is simulated using renormalization group (RNG) turbulence model with ANSYS 2018 Fluent software. To solve the model in 3D ways we used Navier-Stroke's equation based on the principle of conservation of mass and momentum within a moving fluid. For studying the flow characteristics, computational fluid dynamics were applied with all geometric parameters and the turbulence was simulated using (RNG) equations of model. In this simulation, the structured meshes were used with different diameters and diameters of meshes are high at the exit channel for obtaining accuracy in the result. In this study, we mainly focus on the effect of Froude number on flow pattern and several other characteristics like velocity distribution, flow separation, bed-shear-stress distribution. The final result of this research work is compared with the condition when no structure is present in the channel. HIGHLIGHTS A numerical investigation is carried out to study the flow field characteristics around a T-shaped spur dike located in a reverse meandering channel with rigid bed.; RNG k – ε turbulence model is implemented using ANSYS fluent software.; Study the effect of Froude number on flow pattern, several characteristics.; The results are then compared with the condition when no structure is placed.;

Keywords

• channel bend
• flow field
• meandering channel
• scour
• spur dyke
• turbulence model