The Research On Algorithm For3D Hexahedral Mesh In Kiva Code

The internal combustion engine work process is a fluid motion, fluid heat and mass transfer, chemical reactions and the interaction between them complex physical and chemical processes. Numerical simulation method to simulate the advantage of a short cycle, low cost, fast and convenient, informative, and applicability, can fully reflect the geometry and other characteristics of domestic and foreign many units it in-depth research, and has made remarkable achievements. Among them, the Los Alamos Laboratory KIVA family of software has been developed the most representative.KIVA uses the arbitrary hexahedron grid units to solve control variables to space discrete model. It makes the program of the object in the calculation of the geometric settle have very strong function. It can calculate the shape of the piston and certain arbitrary shape the combustion chamber. But the program of grid generation algorithm has some shortcomings. Four valve pits of the combustion chamber of the grid are not adapted. This paper on the grid generation algorithm was improved.With the rapid development of modern internal combustion engine development, turbocharged engines tend to the mainstream of the era. Exhaust system design on engine exhaust the use of energy has an important effect. While the KIVA grid generation program has certain blank. The exhaust duct of grid generation has some shortcomings. It can’t make the exhaust main to a tube shape in the crowded gas area. This paper makes an improvement on the grid generation for the appropriate. Make it more accord with the actual.By the use of found, the improved grid generation process effectively reduce Or Even Eliminate Four valve pits of combustion chamber with grid distortion. So the convergences speed up. The calculation results more accuracy. Improve the airway grid generation algorithm. So it can simulate the influence of airway and valve movement rules in cylinder of gas flow and the influence of combustion.