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Master Thesis Report Development of Salome 2D & 3D Meshing template and Grid Generator as well as the trailing edge wake pattern is identical for both the mach and pressure contour. This implies that the use of either Salome or UMG 2 generated mesh will give identical results. Since the CFD results are dependent on the mesh quality as well as obtaining an converged solution, differences in results between both mesh sources can result at times if either criteria are not met. 6.3 Development of 3D Meshing Template The development approach of the 3D template is similar to the 2D template. The Netgen 1D-2D Algorithm is used to generate these meshing template. However, this algorithm is applied specifically to the surfaces belonging to the blade wall as well as the surfaces above and below the blade geometry (see figure 6.10). Within the 3D simulation domain, it is also necessary to ensure that fine discretized 3D mesh is located around the discretized 2D leading and trailing edge surface mesh. Lastly, the projection 1D-2D algorithm is used to produce a periodic boundary condition between the periodic faces of the simulation domain. The algorithm basically projects the nodes from one side of the periodic face to the other side. An illustration of the NASA Rotor 67 Salome mesh which fulfils this criteria is presented in figure 6.9, 6.10, 6.11 and 6.12. Other than the NASA Rotor 67 mesh, this approach was also applied to a centrifugal rotor geometry. This is illustrated in figure 6.13, 6.14 and 6.15. Figure 6.9: Features of a good quality 3D mesh Figure 6.10: Fine Discretized Mesh across the Leading/Trailing edge and the Top/Bottom Blade Surfaces Similar to the 2D mesh development approach, the geometry is first exported into Salome as a ’step’ or ’igs’ file. Thereafter, the geometry is subdivided into faces for which they are used to identify the inflow outflow, periodic 1, periodic 2 and the blade wall of the meshing domain. This is a prior step to be taken for the construction of SU2 based mesh. Instead of using edges to define the boundary markers, faces are used to identify the boundary markers for 3D geometries. The development of this meshing template also involves the use of Netgen 1D-2D meshing algorithm. The growth rate of the mesh is controlled through the fineness ratio, a setting adjustable by the user in the meshing template. In addition, the user is able to control both the minimum and maximum allowable discretization of the mesh. The viscous layer option in SALOME enable the users to control the total thickness, number of 66PDF Image | Aerodynamic Design of the NASA Rotor 67 for Non Uniform Inflow
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