Automatic hybrid-cartesian grid generation for high-reynolds number flows around complex geometries

Michel Delanaye, M. J. Aftosmis, M. J. Berger, Y. Liu, T. H. Pulliam

Research output: Contribution to conferencePaperpeer-review


The aim of this paper is to present an automatic and robust approach to generate meshes for viscous flow simulations. The procedure is based on the generation of a hybrid Cartesian grid, and consists of four parts. A Cartesian grid is first generated around the geometry and transports the geometric length scales between the different body components. We also use this mesh in generating a new surface grid, suitable for the second step without the user’s intervention. Secondly, body conforming meshes are generated around each body component. For that purpose a robust marching front technique based on a predictor-corrector approach has been developed. Particular attention is devoted to the grid generation in concave and convex regions. A methodology based on grid line merging and grid line spawning from a point is presented. We also allow grid lines in concave regions to initially overlap; the overlapping regions are automatically removed, and gaps are fllled with Cartesian cells. In the third step, overlapping grids from different body components are treated. Finally, a new Cartesian grid is generated around the set of body conforming meshes and intersected with the latter, yielding the flnal grid. The grid generation procedures do not require human intervention and can be fully automated. Several 2D turbulent viscous flow simulations around single and multi-element airfoils demonstrate the feasibility of the approach. Signiflcant effort is devoted to determine the accuracy, robustness and convergence properties of the method. A new robust discretization of the viscous term of the Navier-Stokes equations applicable at the interface between the Cartesian and body conforming grids is presented.

Original languageEnglish (US)
StatePublished - 1999
Event37th Aerospace Sciences Meeting and Exhibit, 1999 - Reno, United States
Duration: Jan 11 1999Jan 14 1999


Other37th Aerospace Sciences Meeting and Exhibit, 1999
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering


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