Boundary element solution method is introduced for radiation heat transfer problem with objects inside a 2-D enclosure, where shadow zone exists. Surfaces are assumed as diffuse gray in a transparent medium. Boundary integral and boundary element equations were derived from radiation transfer equation, and their theory is reviewed. Also the process of solution methods to implement the boundary element method is analysed and explained with consideration of shadow effects. BEM solution results are compared with two test problems and are found to be good agreements with the both analytic and ANSYS Fluent numerical solutions. Therefore the current BEM analysis for radiation heat transfer problem can be considered as verified, and their efficacy with engineering applicability is established as a result.

ABSTRACT
 1. 서 론
 2. 경계요소식의 구성
 3. GMRES 해법
 4. Preconditioning
 5. Preconditioned GMRES 알고리즘
  5.1 재시작 전 반복 횟수 설정
  5.2 외부 루프 시작과 초기조건 설정
  5.3 내부 루프 시작
  5.4 Arnoldi 과정 시작
  5.5 내부 루프의 수렴 체크
  5.6 근사해의 계산
  5.7 외부 루프의 수렴 체크
 6. 결과 및 고찰
 7. 결 론
 후 기
 References

• 최창용(Jeonju University) | Chang-Yong Choi Corresponding Author