Numerical Simulation of the Counter-Current Limited Flow (CCLF) from the Collider Experiment Using VOF-RANS
DOI:
https://doi.org/10.70567/mc.v41i18.97Keywords:
Counter-Current Limited Flow (CCLF), Numerical simulation, VOF-RANS, Hot-leg, Liquidgas interface, Turbulence modelsAbstract
This work focuses on the simulation of the Counter-Current Flow Limitation (CCFL) phenomenon in an experimental hot-leg, which is crucial for safety in nuclear power plants. CCFL occurs when the vapor flow, due to high core temperatures, hinders the proper entry of coolant water, compromising reactor operation. Utilizing the VOF-RANS model and the k-omega RNG turbulence model, both implemented in OpenFOAM-v2206, this study reproduces the experimental results of Issa, focusing on the pressure difference in the hot-leg for the first flow region with a liquid dimensionless velocity of Jw*^0.5 W = 0.105. The simulation allows for a detailed comparison of CCFL regimes with experimental data and demonstrates a significant improvement in accuracy by incorporating the variable density turbulence model.
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