Numerical simulations of evaporation driven turbulent convection driven by a descending free surface
(2022) 14th European Fluid Mechanics Conference — Location: Athens, Greece (13.September.2022)
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- Abstract
- Turbulent thermal convection in water pools driven by evaporation across the free surface is encountered in various natural phenomena as well as in industrial applications. In this work we present numerical results obtained via Large Eddy Simulations of the problem in hand and for Rayleigh numbers in the range of Ra = 1.3 x 108 and Ra = 5 x 108. Our numerical setup considers a uniformly heated bottom wall and a free-slip upper boundary that approximates the free surface. Heat and mass transfer across the upper boundary are taken into account via a dynamic and inhomogeneous evaporation model. The evaporative and convective heat losses predicted by this model are then employed to assign a non-zero Neumann condition for the temperature. According to it, the temperature gradient is not uniform across the free surface and evolves with time. Also, the descent of the free surface due to evaporation is accounted for by dynamically remeshing the computational domain during the simulations. In the first part of the talk, we outline the evaporation model and the remeshing procedure. In the second part we present the results of our simulations. In particular, we analyze the flow topology, including the structure and properties of the Large Scale Circulation, and discuss the turbulence statistics of the flow field
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Marichal, J., & Papalexandris, M. (2022). Numerical simulations of evaporation driven turbulent convection driven by a descending free surface. 14th European Fluid Mechanics Conference, Athens, Greece. https://hdl.handle.net/2078.5/244709