EFFECT OF ADDITIONAL FIN AND THICKNESS OF BASIC PLATE OF THE OCEAN BOTTOM UNIT (OBU) MODEL USING COMPUTATIONAL FLUID DYNAMICS METHODS
YUDIAWAN FAJAR KUSUMA (1), HANNI DEFIANTI (2), FADILAH HASIM (3), F. ANDREE YOHANES (4)

(1) (2) (3) (4) NATIONAL LABORATORY FOR AERODYNAMICS, AEROELASTICS, AND AEROACOUSTICS OF TECHNOLOGY (BBTA3) - AGENCY FOR THE ASSESSMENT AND APPLICATION OF TECHNOLOGY (BPPT)

Abstract

Ocean Bottom Unit (OBU) is part of the tsunami buoy system which is located on the ocean floor. The OBU will be discharged from the transport vessels carrying the bouy tsunami system. The OBU model that is made must withstand various conditions such as when it is discharged from a transport ship so that it can land perfectly as well as strong ocean currents while on the bottom sea. One of the studies conducted by BBTA3 is a study of aerodynamic characteristics using a computational fluid dynamics method. There are 2 OBU models to be simulated, namely the finless OBU model (type 2) and the fin OBU model (type 1) with variations in wind speed from the side. The simulation results show that the addition of the thickness of the base plate and fins makes the aerodynamic coefficient greater than the OBU type 2 model. In addition, the addition of the thickness of the base plate and fins makes the OBU type 1 model less stable when exposed to wind from the side when compared to the OBU model type 2.

Keywords: ocean bottom unit- addition of fins- addition of base plate thickness- aerodynamic coefficient

Topic: Symposium on Energy and Environmental Science and Engineering