수치해석을 통한 부유성 위험유해물질의 확산특성 연구 및 예측모델 개발

Abstract

This study aimed to numerically investigate the propagation characteristics of floating hazardous noxious substances (HNS) and development of predicted model. ANSYS FLUENT(V. 17.2) was used for the calculations based on the RANS (Reynolds-Averaged Navier-Stokes) model together with the standard k-ε model. We also calculated the scalar transport equation for estimating the spatial and transient behaviors of HNS. Three key parameters such as the width of HNS layer, HNS concentration on the seawater, and propagation velocity were used to analyze the propagation characteristics of HNS. As the results, the lower the density, the wider the HNS layer. The HNS floating on the sea surface is pushed by the newly spilled fluid and spreads in a direction perpendicular to the ocean current. Therefore, the smaller the density, the larger the buoyancy acts on the HNS and the wider HNS layer is formed. Also, as the current velocity increases, transport by advection becomes active and the width of HNS layer decreases. The propagation velocity is linearly proportional to about 60 % of the ocean current velocity. The HNS concentration on the seawater is closely related to the width of HNS layer. Asthe width of HNS layer wider, the concentration become lower. In the preceding results, the greater the density, the smaller the width of the layer. At this time, the HNS concentration on the seawater increases because the HNS floating on t