ANALYSIS OF WATER FLOW RATE AT A DAM WITH VARIOUS GATE OPENING USING COMPUTATIONAL FLUID DYNAMICS METHOD

• Main Author: Yusuf Izzuddin, Maulana
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/57187
• Institution: Institut Teknologi Bandung

The demand for electricity in Indonesia continues to increase, but the fulfillment is still dominated by coal fuel. Hydropower can be an alternative power plant in Indonesia where the potential is 75 GW. This condition requires further development of the use of dams as hydropower. In this final project, a dam design is examined under extreme conditions in order to get the dam operates under this condition and determine the capacity of water flowrate that can flow through the floodgates of the dam. The design of the dam with variations in the form of four types of gate openings was tested with the aim of knowing the limits of the capacity of a floodgate. Multiphase flow modeling analysis was carried out on dams with extreme discharge, namely 1,720 m3/s, which was obtained from the maximum value of the design flood discharge analysis, and turbine water discharge of 78.2 m3/s, which was obtained from turbine specifications so that it could produce turbine power of 9.9 MW. Simulations are carried out using ANSYS CFX software which varied the gate openings into four types at steady-state conditions. At a fully open and half-open openings, the discharge is 1,641.67 m3/s, while one-third open and one side gate (small) closed is 1,422.0 m3/s and 1,545.7 m3/s. In one-third open and one side gate (small) closed, the dam is in an unsafe condition when the water flow is in extreme conditions, so that it can cause flooding in the area around the dam, or referred as overspill and can disrupt the performance of the powerhouse, which contains the turbine and electrical components. On the other hand, in the fully open and half-open variations, the dam is in a safe condition. The maximum water discharge capacity that can pass through the design gate of the dam at fully open opening without causing overspill is 2,121.8 m3/s.