Study Of Surface Mesh Optimization Of Diesel Engine Numerical Simulation

In traditional diesel engine CFD analysis, modeling grid technology is the bottleneck which limits the efficiency and accuracy, the mesh density control also besets many scholars. Most software can’t do the direct control of the grid reaches its most excellent numerical simulation density. High efficiency and high accuracy cylinder CFD analysis needs appropriate mesh. With grid technology development and innovation, a series of new technology continues to show its advantages, now popular software CONVERGE presented mesh segmentation technique based on the internal orthogonal grid cut by surface mesh, which provides a new method. Whether the surface mesh quality is directly related to the overall computing grid computing requirements to achieve the simulation, the surface of the grid control methods in recent years has also been considerable development, more commonly used is the grid surface and the original surface were the fit discrimination. Diesel geometric model for numerical simulation has complex structure, optimizing the surface grid is not a simple task.This paper combines the characteristics of the surface mesh geometry and engine control method, using a mesh editing software utilizing ICEM CFD mesh generation preparation optimization algorithm iterative calculation to obtain a reasonable surface mesh as a preliminary work for whole mesh generation. This paper combined diesel engineering CAD drawings and CAD modeling software Pro/E modeling method, obtained a geometry creation approach by directly importing drawings and completed the establishment of geometric model for diesel engine simulation. Create grid of the geometric model with mesh editing software ICEM CFD as a basis for the automatic mesh generation method of diesel engine by writing command streaming file of ICEM CFD. Write VB code to create command stream file automatically to drive ICEM CFD in the background to generate surface grid for diesel engine simulation automatically. Establish a grid system to adjust the size of the partition automatically based on vertex flatness criterion. Partly integrate VB2010 and ICEM CFD, establish a surface mesh optimization platform of diesel engine initially, various software parameters can be passed to each other by a simple parameter input interface. Designers can access functions such as creating diesel engine geometric model grid and optimizing automatically.