Scale adaptive simulations applied to fully cavitating turbulent flow in injector nozzles
Date
2022-04-01
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Universidad Tecnológica Nacional. Faculatd Regional Mendoza
Abstract
The unsteady and turbulent pressure-driven cavitating flow under fully cavitation
conditions through a sharp-edged orifice is studied by numerical simulations. Unsteady cavitating
flow is a typical flow configuration in fuels injectors and brings a challenge in the numerical
modeling of two-phase fluid flows due to the high-pressure gradients involved and the high ratio
of liquid and vapor density. Under this flow condition computationally intensive unsteady
simulations are necessary to accurately simulate the irregular cyclic process of bubble formation,
growth, filling by water jet re-entry and its breakoff. The capabilities of Reynolds Averaged
Simulations are assessed to ensure a suitable cavity structure prediction to capture the main
shedding frequencies and the vapor fraction variations along the nozzle. This study is focused on
the performance of a modified version of the Shear Stress Transport turbulence model, involving
a Scale Adaptive Simulations sub-model related to the unsteady turbulent flows modeling. The
obtained results show that the proposed option would allow studies of developed cavitating flows
by means of an unsteady Reynolds Averaged Simulation, computationally less expensive than the
Large Eddy Simulations option, being this last option not completely affordable for simulating
turbulent flows in industrial problems nowadays.
Description
Keywords
Developed cavitation, Injectors, Turbulence, Eddy viscosity models, SAS Validation/Calibration
Citation
Asociación Mecánica Computacional
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