소성∙가공 (Transactions of Materials Processing)

  • 제13권4호
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  • Pages.334-341
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  • 2004
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  • 1225-696X(pISSN)
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  • 2287-6359(eISSN)
한국소성∙가공학회 (The Korean Society for Technology of Plasticity and materials processing)
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오차 예측과 격자밀도 지도를 이용한 적응 Delaunay 격자생성방법

Adaptive Delaunay Mesh Generation Technique Based on a Posteriori Error Estimation and a Node Density Map

  • 홍진태 (한국과학기술원 기계공학과) ;
  • 이석렬 (한국과학기술원 기계공학) ;
  • 박철현 (한국과학기술원 기계공학) ;
  • 양동열 (한국과학기술원 기계공학과)
  • 발행 : 2004.07.01
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초록

In this study, a remeshing algorithm adapted to the mesh density map using the Delaunay mesh generation method is developed. In the finite element simulation of forging process, the numerical error increases as the process goes on because of discrete property of the finite elements and distortion of elements. Especially, in the region where stresses and strains are concentrated, the numerical error will be highly increased. However, it is not desirable to use a uniformly fine mesh in the whole domain. Therefore, it is necessary to reduce the analysis error by constructing locally refined mesh at the region where the error is concentrated such as at the die corner. In this paper, the point insertion algorithm is used and the mesh size is controlled by using a mesh density map constructed with a posteriori error estimation. An optimized smoothing technique is adopted to have smooth distribution of the mesh and improve the mesh element quality.

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참고문헌

  1. Adv Eng. Softw v.28 Three-dimensional finite element adaptive analysis of incompressible flow based on control of node density distribution and a posteriori error estimation H. Okuda;T. Yashiki;G. Yagawa https://doi.org/10.1016/S0965-9978(96)00053-1
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  9. 한국소성가공학회 춘계학술대회논문집 격자압축을 이용해 구성된 격자의 효과적인 격자유연화 방법 홍진태;이석렬;양동열
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  11. J. Comput. Phys. v.46 Adaptive zoning for singular problems in two dimensions J. Brackbill;J. Saltzman https://doi.org/10.1016/0021-9991(82)90020-1