  In this study, we present a parallel topology algorithm with a suitable
interpolation method for chimera simulations in CFD. The implementation is done
in the unstructured Finite Volume (FV) framework and special attention is given
to the numerical algorithm. The aim of the proposed algorithm is to approximate
fields with discontinuities with application to two-phase incompressible flows.
First, the overset topology problem in partitioned polyhedral meshes is
addressed, and then a new interpolation algorithm for generally discontinuous
fields is introduced. We describe how the properties of FV are used in favor of
the interpolation algorithm and how this intuitive process helps to achieve
high-resolution results. The performance of the proposed algorithm is
quantified and tested in various test cases, together with a comparison with an
already existing interpolation scheme. Finally, scalability tests are presented
to prove computational efficiency. The method suggests to be highly accurate in
propagation cases and performs well in unsteady two-phase problems executed in
parallel architectures.
