Hydraulics & Waterways
394831 - EFFECT OF RHEOLOGY FOR FLOW PAST A BOTTOM RACK
Wednesday, June 6
8:30 AM - 10:00 AM
Location: Regency Room
Pranab Mohapatra, Gandhinagar, India – Indian Institute of Technology Gandhinagar
This paper presents the numerical simulation of flow past a bottom rack using CFD software, Flow-3D. The governing equations for fluid flow are the Reynolds-averaged Navier–Stokes equations (RANS) along with the volume of fluid (VOF) equation for surface tracking. In addition, the Renormalized group (RNG) turbulence model is also used. The numerical model is validated by comparing with experimental results for steady flow surface profile available in literature. Steady flow past the bottom rack indicates that the flow field is one dimensional away from the bottom rack. However, it becomes two- and three dimensional as the flow approaches the bottom rack. Results for free surface profile, velocity profile and turbulence characteristics are also presented. Five different fluids are considered to study the effect of rheology on discharge characteristics of bottom rack. As indicated in the simulations, viscosity is the dominating factor influencing the discharge through the bottom rack. Density also has an impact on the discharge characteristics. Based on the cases studied, recommendations for the size of the bottom rack, considering rheological characteristics of the fluid, are made.
Keywords: Bottom racks, Flow-3D, water intake structure structures, RNG Turbulence model.