2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/7359We first present a summary of our numerical work on accretion discs in close binary systems. Our recent studies on numerical simulations of the surface flow on the mass-losing star in a close binary star is then reviewed.8 pages, 5 figures, to appear in the proceedings of 6th International Nobeyama WorkshopAstrophysicstext