The major issues affecting lake water intake structures and pipelines are frazil ice events during the winter time that reduce the intake water flow. These events can completely block the trash rack and unexpectedly shut down the intake facility. The blockages of intake trash racks occur in cold weather and under water, making them difficult to observe and measure. Computational fluid dynamics (CFD) models provide a valuable method of understanding the operating conditions and phenomena that occur inside the water intake with different blockage percentages. Hot flow is simulated to be injected into the water intake to against the frazil ice formation. Simulation results include the flow velocity, mass flow rate and the water temperature distribution. The injected flow includes hot water and steam bubbles. It is concluded that hot water injection can only heat the water flow below the trash rack, but steam bubble injection rises throughout the geometry and produces turbulences along the bubble paths.

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