[en] A mathematical model of fluid flow and turbulent characteristics in continuous casting tundishes has been develpoed with the use of 2-D computational scheme together with adequate modelling of turbulent viscosity. Computations for a various flow control in a tundish are presented via full scale molten steel system. Similary, the behavior of non-metallic inclusions is modelled by establishing a particle force balance in a moving fluid system. The results obtained from these studies are expected to be used semi-quantitatively in the conventional metallurgical processes governed by transport phenomena. (Author)