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preprocessing methodology to reducing calculation errors in 3 dimensional model for development of heat transfer analysis program for 3 dimensional structure of building

건물의 3차원 구조체에 대한 전열해석 프로그램 개발 중 3차원 모델의 해석 오류 저감을 위한 사전 수정 방법 연구

  • Received : 2016.01.04
  • Accepted : 2016.02.16
  • Published : 2016.02.29

Abstract

This study is part of three-dimensional(3D) heat transfer analysis program developmental process. The program is being developed without it's own built in 3D-modeller. So 3D-model must be created from another 3D-modeller such as generic CAD programs and imported to the developed program. After that, according to the 3D-geometric data form imported model, 3D-mesh created for numerical calculation. But the 3D-model created from another 3D-modeller is likely to have errors in it's geometric data such as mismatch of position between vertexes or surfaces. these errors make it difficult to create 3D-mesh for calculation. These errors are must be detected and cured in the pre-process before creating 3D-mesh. So, in this study four kinds of filters and functions are developed and tested. Firstly, 'vertex error filter' is developed for detecting and curing for position data errors between vertexes. Secondly, 'normal vector error filter' is developed for errors of surface's normal vector in 3D-model. Thirdly, 'intersection filter' is developed for extracting and creating intersection surface between adjacent objects. fourthly, 'polygon-line filter' is developed for indicating outlines of object in 3D-model. the developed filters and functions were tested on several shapes of 3D-models. and confirmed applicability. these developed filters and functions will be applied to the developed program and tested and modified continuously for less errors and more accuracy.

Keywords

Numerical methods;Heat transfer;Unstructured grid, matrix solver;Cell-centered scheme

References

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Acknowledgement

Supported by : 국토교통부