2025/09/04 by López-de-Bertodano, Alexander, Clausse, Alejandro
#FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn)
paper · doi:10.48550/arxiv.2509.04679
The 1-D Two-Fluid Model (TFM) promises a powerful and computationally cheap platform for simulating multi-fluid flow phenomena. However, runaway Kelvin-Helmholtz instabilities plagued previous approaches, necessitating aphysical regularizations. We demonstrate a novel physics-based approach, using a simple turbulent viscosity model to provide nonlinear stabilization, compatible with inertial coupling. We develop a set of analytical and numerical tools to investigate the resulting dynamics, including turbulent cascades, chaos, and formation of churn or slug flow. Our approach opens up a wide range of new capabilities for the TFM by capturing the Kelvin-Helmholtz instability physically.