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Cooling Turbine Blade CFD Grid Generation

Author: LiuFei
Tutor: ZhongYiCheng
School: Nanjing University of Aeronautics and Astronautics
Course: Fluid Machinery and Engineering
Keywords: cooling turbine blade unstructured grid Delaunay triangulation boundary recovery surface mesh hybrid grid OOP
CLC: V232.4
Type: Master's thesis
Year: 2009
Downloads: 188
Quote: 3
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Abstract


For complex model unstructured grid has preferable adaptability, and which is widely applied to the CFD. In this paper, we use Delaunay triangulation as base algorithm, and object-oriented programming as technology to develop a set of unstructured grid generation software. The grid generation software can be applied to two-dimension plane, surface, three-dimension entity’s unstructured grid generation, as well as semi-structured grid generation. And the adoption of the software is successfully generated unstructured grid cooling turbine blade.This paper study the Delaunay triangulation of the key issues and corresponding solutions, including the insertion point algorithm, floating-point error handling, mesh optimization techniques, the boundary recovery. And the combination of conforming boundary recovery and constrained boundary recovery is used to deal with boundary recovery. Experiment proves that the method can complete three-dimensional grid boundary recovery preferable, and has a certain degree of adaptability to complex model. Based on the algorithm of Delaunay triangulation, introduce a metric tensor to complete the surface triangulation. And the definition of the cavity in a Riemannian space is given. The examples demonstrate the advantages of the surface triangulation software which indicating that dealing with complex model and high quality. Surface mapping method is adapted for generating semi-structured grid. Joining the grids near the wall and in the other fields into hybrid grids is the final step for generating hybrid grids. And has carried on this mesh generation system and the existing geometric modeling system the organic fusion, enables to be able to produce the geometric model and the computation grid fast regarding the specific model.According to the Delaunay method’s inherent characteristics designed the rational data storage structures and geometric topology system. The use of C + + language development unstructured grid generation for achieving the various functional modules. And has carried on this mesh generation system and the existing geometric modeling system the organic fusion, enables to be able to produce the geometric model and the computation grid fast regarding the specific model.

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CLC: > Aviation, aerospace > Aviation > Aero-engine ( propulsion system ) > Engine parts > Blade
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