Multiphase flows are found in many mechanical, process, chemical, maritime, civil, and biomedical applications. Their features include transport phenomena in bubbles, droplets, films, and sprays, potentially in a reacting environment; turbulence modulation and drag reduction in bubbly flows, fluid-structure interactions in free surfaces, or cavitation in rotating machinery, among others [1]. The assessment of such critical features requires describing fundamental physical phenomena including bubble growth, detachment, dispersion, deformation, coalescence, and collapse; film instability and breakage; jet atomization, phase change, Marangoni convection, or electro-wetting, among others. All these physical phenomena share the core role of the two fluids interface in their underlying mechanisms. To gain a deeper understanding in multiphase flow physics, numerical simulation is an invaluable tool. Nonetheless, it requires resolving a moving, deformable, interface; treating potentially huge differences in physical properties, and including interfacial phenomena itself, like surfactants surface diffusion. Consequently, the numerical simulation of multiphase flows is a rich field of research with several open questions, as proven by the same coexistence of several numerical techniques. The numerical treatment of multiphase flow physics is then challenged to develop better numerical schemes [2] that improve conservation (mass, momentum, energy), surface tension, interface reconstruction (surface area, normal vector, curvature), interface transport; and computational techniques for time-stepping, variable coefficient Poisson equation, Adaptive Mesh Refinement, or numerical instabilities, among others. In this mini-symposium, we want to gather developers of interface-resolved multiphase flows simulations (e.g.: F-T, VOF, (C)LS, PF, etc) and practitioners of multiphase flows simulations, from different application areas, to exchange their experiences in solving the numerical challenges highlighted above and the common challenges experienced in industry. REFERENCES [1] D. Lohse, Bubble puzzles: From fundamentals to applications. Physical Review Fluids. 3 (2018) [2] S. Popinet, Numerical Models of Surface Tension. Annual Review of Fluid Mechanics. 50 (2018)