HYDRODYNAMIC FORCE ANALYSIS OF TRASH DIRECTOR PONTON ON CILIWUNG RIVER TRASH FILTER CONCEPTUAL DESIGN USING COMPUTATIONAL FLUID DYNAMICS METHOD

• Main Author: Tio, Andreas
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/52966
• Institution: Institut Teknologi Bandung

In the trash filter concept design for Sungai Ciliwung, ponton is the floating structure that is used to direct the trash flow at the free surface. This structure is subjected to hydrodynamic forces resulted from the water flow. Hydrodynamic forces information is needed for material selection and supports construction design for the pontons. This research consists of two-phase flow simulation to compute the hydrodynamic forces at the pontons. Water flow velocity is varied to see its effect on the hydrodynamic forces at the ponton. The flow simulation utilizes Large Eddy Simulation (LES) turbulent model and Volume of Fluid (VOF) multiphase model. The simulation model is validated by conducting simulation based on experiment which was done in a reference literature and comparing the simulation result with the experiment result. The magnitude of lift and drag forces acting on ponton are obtained by conducting simulation of water flow passing pontons separatedly. Lift force analysis is done by comparing its magnitude with the magnitude of buoyancy force, while drag force analysis is done by observing the correlation between the value of drag force coefficient and Reynolds number. The maximum hydrodynamic forces are the forces acting at the first ponton with the lift force magnitude of -1000,28 kN and drag force magnitude of 569,78 kN. These maximum forces are obtained when the inlet velocity of the river is 5 m/s.