Wall-Resolved Large Eddy Simulations of the Transient Turbulent Fluid Mixing in a Closed System Replicating a Pressurized Thermal Shock
نویسندگان
چکیده
The isothermal mixing of a heavy and light liquid different physical properties is numerically investigated by means Large Eddy Simulations. validation based on experimental data held in system reproducing various components pressurized water nuclear reactor, during scenario cold injection at low Atwood number 0.05. flow has two distinct stages: first buoyancy-driven phase characterized fluid front development the leg gives rise to Kelvin–Helmholtz whorls under action density changes. Then, discharges into downcomer filled with liquid, which causes turbulent mixing. These phenomena are analyzed through single-phase approach where working either variable or modeled Boussinesq approximation. influence grid refinement deeply examined, shows that mesh convergence well achieved for main quantities, unlike low-magnitude spanwise components. Overall, numerical solutions found reproduce measurements fair accuracy both models used. latter exhibit similar trends, due small difference consideration. predictions appear be more challenging owing strongest turbulence than leg, some features being not properly captured. However, incomplete somewhat dubious strict simulations. Lastly, distribution dowcomer investigated, providing further insight process.
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ژورنال
عنوان ژورنال: Flow, turbulence and combustion
سال: 2021
ISSN: ['1573-1987', '1386-6184']
DOI: https://doi.org/10.1007/s10494-021-00272-z