مدل سازي عددي پروفيل سرعت در جريان هاي گل آلود پيوسته و بررسي تاثير شيب، غلظت و دبي بر آن

Modeling of Velocity Profile of Continuous Turbidity Currents and Effect Study of Discharge and Concentration on It

A numerical modeling used Flow 3-D commercial code, was prepared to compare with a laboratory analogue of turbidity current. The experimental studies was constructed previously, using a constant head tank and a flume (1200x150x75 cm) to produce continuous turbid under flow, where the density difference was produced by addition of kaoline powder to clean water by Hosseini et al.. This numerical model was applied to study kinematics structure of turbidity current, calculating the velocity profile and mean velocity Result shows the velocity distribution can be reasonably well represented by experimental observations, similarity profiles using new characteristic length scale. From these measurements, some characteristic ratio such as mean velocity, and maximum layer average velocity have been obtained that show good agreement with previous experimental study. These results allow a rough estimation of flow structure in the body of turbidity current. Finally, the effect of discharge and concentration on hydrodynamic structure of turbidity currents was studied. The differences between numerical and experimental results are reasonable.