Authors: Desta Milkessa Edessa; Lutz Kleinsorge; Robert Bronsart
Addresses: Faculty of Mechanical Engineering and Maritime Technology, University of Rostock, Germany ' Faculty of Mechanical Engineering and Maritime Technology, University of Rostock, Germany ' Faculty of Mechanical Engineering and Maritime Technology, University of Rostock, Germany
Abstract: This paper presents an automatic ship hull form CAD data repairing and domain preparing tool. The tool is capable to repair commonly found geometrical and topological inconsistencies in and between parametric and triangulated surfaces. Parametric surfaces are read from initial graphics exchange specification (IGES) file format and triangulated surfaces are read from standard tessellated language (STL) file format. Based on the repaired hull form parametric surfaces, automatic domain preparation strategies are implemented for mesh generators such as Numeca HEXPRESS and Open FOAMs SnappyHexMesh. Region identification method is developed to divide the hull form into different regions and export the repaired and consistent geometry in coloured STL file format. The repair, domain preparation, and region identification algorithms are tested against several ship hull form representations to evaluate the tool robustness. The results achieved reveal that the developed tool substantially decreases the time, and therefore cost, required for CAD data repairing and domain preparation for downstream application.
Keywords: computational fluid dynamics; CFD; CAD data repair; domain preparation; downstream applications; ship hull form representations; mesh generation; ship hulls; IGES; parametric surfaces; region identification.
International Journal of Computer Aided Engineering and Technology, 2017 Vol.9 No.1, pp.18 - 37
Received: 30 Jun 2014
Accepted: 23 Oct 2014
Published online: 06 Nov 2016 *