20.500.12556/RUL-159141 A coarse grid approach for single bubble boiling simulations with the volume of fluid method Direct Numerical Simulation (DNS) of boiling flows requires a substantial number of grid points to precisely resolve the thermal boundary layer surrounding the phase interface. This resolution is vital for accurate calculation of the temperature gradient, which directly influences the mass transfer rate. However, the thermal boundary layer is typically three orders of magnitude smaller than the bubble's diameter, leading to an impractical number of required grid points for computational resources available on affordable PCs or workstations. To address this challenge and enable bubble-growth boiling flow simulations without relying on a supercomputer, we propose a novel numerical method within the framework of the Volume-Of-Fluid (VOF) approach. This method employs a coarse grid, where the grid size may exceed the thickness of the thermal boundary layer. By adopting this approach, we aim to achieve accurate simulation results while reducing the computational requirements associated with grid resolution. In our coarse grid approach, we model the thermal boundary layer and “artificially” maintain the interface temperature above the saturation temperature in the solution of the temperature field by incorporating a temperature-profile sharpening coefficient . To validate the effectiveness of this approach, we conducted two validation cases: the Scriven bubble-growth problem and an experimental measurement of single bubble growth on a heated surface. Encouragingly, both cases showed good agreement with the simulation results. In the latter case, we introduced additional subgrid scale models, i.e., a microlayer model and a model of contact-angle hysteresis. These models enabled us to evaluate the bubble force balance accurately. The comprehensive approach described here represents an advancement in the development of sharp-interface phase-change simulation methods that can be applied to larger-scale problems and parametric investigations. force balance bubble departure computational fluid dynamics volume of fluid sharpening contact angle hysteresis vrenje v bazenu simulacije rasti mehurčka volumen fluida redka mreža koeficient izostritve true false true Angleški jezik Slovenski jezik Članek v reviji 2024-07-02 08:53:29 2024-07-02 08:53:36 2024-07-12 03:44:55 0000-00-00 00:00:00 2024 0 0 16 str. Vol. 271, art. 106182 Mar. 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532:544 0045-7930 10.1016/j.compfluid.2024.106182 200293635 Bures...-A_coarse_grid_approach_for_single_bubble_boiling_simulations_with_the_volume_of_fluid_method.pdf Bures...-A_coarse_grid_approach_for_single_bubble_boiling_simulations_with_the_volume_of_fluid_method.pdf 1 93625DD0B99B89334DA788DB7E472CBB ec9561ca74c84de76427e13b4e4236c267c209bcf1dc1fda36b603e3da458779 1202835b-3842-11ef-926e-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=187061 https://www.sciencedirect.com/science/article/pii/S0045793024000148 1 cdedf0f3-383f-11ef-926e-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=187058 Fakulteta za strojništvo 0 0 0