An efficient interface-tracking method for evaporative surfaces
(2022) 14th European Fluid Mechanics Conference — Location: Athens, Greece (13.September.2022)
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- Abstract
- Evaporative surfaces constitute a common feature of oceanic flows but are also encountered in industrial applications such as in spent-fuel pools of nuclear power plants. In fact, after the catastrophic events that occurred in Fukushima in 2011, the post-accident study commissioned by the Organisation for Economic Cooperation and Development highlighted the importance of developing reliable computational tools for the study and accurate prediction of the phenomena occuring during a loss of cooling accident in such pools. Motivated by this need, in this work we present an algorithm for the tracking of the water-air interface during evaporation-driven thermal convection. To this end, we consider an Euler-Euler formulation of the two-phase system, i.e. the liquid water below the free surface and the air-water vapor mixture above. Since the emerging flow structures are due to free-surface evaporation and thermal convection, the two-phase system is described by the low-Mach number approximation of the compressible Navier-Stokes-Fourier equations. Herein, the low-Mach number equations are treated numerically via a finite-volume algorithm that combines a predictor-corrector time- advancement scheme with a projection method for the computation of the pressure field1. This scheme is solved on a collocated grid and, therefore, employs a Rhie-Chow type flux-interpolation method in order to avoid the odd-even pressure decoupling problem. The discretization of the free surface is achieved via the Ghost-Fluid method 2,3. Particular care has been paid to render the resulting algorithm sufficiently robust and accurate for the simulation of turbulent two-phase flows with heat transfer, phase change and dynamically evolving material interfaces. In the first part of this talk we elaborate on the design and features of the algorithm. Subsequently, we present results of numerical tests that we performed in order to assess the efficiency of this algorithm, involving evaporation driven thermal convection
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Carlier, J., & Papalexandris, M. (2022). An efficient interface-tracking method for evaporative surfaces. 14th European Fluid Mechanics Conference, Athens, Greece. https://hdl.handle.net/2078.5/102613