DOI QR코드

DOI QR Code

NOVEL GEOMETRIC PARAMETERIZATION SCHEME FOR THE CERTIFIED REDUCED BASIS ANALYSIS OF A SQUARE UNIT CELL

  • LE, SON HAI (DEPARTMENT OF AEROSPACE ENGINEERING, PUSAN NATIONAL UNIVERSITY) ;
  • KANG, SHINSEONG (DEPARTMENT OF AEROSPACE ENGINEERING, PUSAN NATIONAL UNIVERSITY) ;
  • PHAM, TRIET MINH (DEPARTMENT OF AEROSPACE ENGINEERING, PUSAN NATIONAL UNIVERSITY) ;
  • LEE, KYUNGHOON (DEPARTMENT OF AEROSPACE ENGINEERING, PUSAN NATIONAL UNIVERSITY)
  • 투고 : 2021.10.17
  • 심사 : 2021.12.21
  • 발행 : 2021.12.25

초록

This study formulates a new geometric parameterization scheme to effectively address numerical analysis subject to the variation of the fiber radius of a square unit cell. In particular, the proposed mesh-morphing approach may lead to a parameterized weak form whose bilinear and linear forms are affine in the geometric parameter of interest, i.e. the fiber radius. As a result, we may certify the reduced basis analysis of a square unit cell model for any parameters in a predetermined parameter domain with a rigorous a posteriori error bound. To demonstrate the utility of the proposed geometric parameterization, we consider a two-dimensional, steady-state heat conduction analysis dependent on two parameters: a fiber radius and a thermal conductivity. For rapid yet rigorous a posteriori error evaluation, we estimate a lower bound of a coercivity constant via the min-θ method as well as the successive constraint method. Compared to the corresponding finite element analysis, the constructed reduced basis analysis may yield nearly the same solution at a computational speed about 29 times faster on average. In conclusion, the proposed geometric parameterization scheme is conducive for accurate yet efficient reduced basis analysis.

키워드

과제정보

The authors would like to express our gratitude to Dr. Francesco Ballarin at Catholic University of the Sacred Heart for his advice on utilizing RBniCS for certified reduced basis analysis. This work was supported by the 2-year Research Grant from Pusan National University.

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