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Overset or Chimera grid approach is one of methods to cope with complex geometries. A spline based overset grid assembling system has been developed. The system is based on structured grid approach and covers comprehensive features for overset assembling, i.e., grid generation, grid modification, and computing Domain Connectivity Information (DCI) for overset interpolation. Ferguson spline curve is used to compute curves through grid points and cell centers for trimming grids and computing DCIdoi:10.17265/2159-5291/2016.09.001 fatcat:t3wei7t4yvay7jqc6ame7dhvve