In computation of two-fluid flows, in some cases the interface might be too complex to track while keeping the frequency of re-meshing at an acceptable level. Not being able to reduce the frequency of re-meshing in 3D might introduce overwhelming mesh generation and projection costs, making the computations with the interface-tracking technique no longer feasible. In such cases, interface-capturing techniques, which do not normally require costly mesh update steps, could be used with the understanding that the interface will not be represented as accurately as we would have with an interface-tracking technique.Tezduyar, T. "Interface-tracking and interface-capturing techniques for computation of moving boundaries and interfaces." Proceedings of the 6th World Congress on Computational Mechanics, On-line publication: http://wccm. tuwien. ac. at/, Paper-ID. Vol. 81513. 2002.
