Abstract Submission: A new intake structure was to be designed at the bottom of a river in a cold region because the existing intake near the shoreline had been covered by frazil ice of surface slush type. Frazil ice of disk crystal type is expected to form upstream of the two potential locations of the intake: Hole 1 and Hole 2. In addition, Hole 2 is located downstream of a railroad bridge, and trains could spill contaminants into the river. The main objective of the analysis was to evaluate the potential for entrainment of frazil ice and contaminants by the intake structure. ANSYS CFX, a commercial software package for computational fluid dynamics, was used to simulate the flow structure, trajectories of frazil ice particles, and transport of contaminants in 3-D. Trajectories of frazil ice particles were simulated using the Lagrangian tracking method, and transport of a contaminant was simulated by considering a water-like fluid with different density and viscosity as the second continuous phase. Frazil ice of disk crystal type was modeled by using drag coefficient and frontal area. Three diameters of frazil ice particles, two directions of frazil ice particles relative to local flow direction, and three kinds of contaminants were considered. The results from the simulations showed that the potential for entrainment of frazil ice was high in Hole 1 but low in Hole 2. The simulations also provided information about the location of contaminant spill on the railroad bridge that could cause entrainment of the contaminant by the intake.
.jpg "Shinjiro Miyawaki (he/him/his) photo")
