The QM-YIX method and adaptive angular quadrature for ray effects mitigation
The ray effects of YIX method for the radiative heat transfer in a three-dimensional nonhomogeneous participating medium are studied in this paper. Different remedial methods for efficient treatment of the ray effects are presented. To demonstrate the effectiveness of the methods, ray effects caused by (1) abrupt step change in the boundary conditions and (2) the stepwise variation of the source function are discussed. In the QM-YIX method, the mitigation of the ray effects is achieved by dividing the radiative transfer into emission and scattering components, where the former is solved by the quadrature method (QM) and the later by the YIX method separately. In the second approach, a pseudo-adaptive angular quadrature is implemented in the YIX method to mitigate the ray effects. The adaptive angular quadrature uses different number of angular abscissa in different direction according to the source and the severity of the ray effects. The results by the QM-YIX method and a pseudo-adaptive angular quadrature method are compared with the solutions obtained by the QM. The QM solution is used as the basis of comparison because of its high order accuracy.
- Research Organization:
- Florida Inst. of Tech., Melbourne, FL (US)
- OSTI ID:
- 20002480
- Report Number(s):
- CONF-990805--
- Country of Publication:
- United States
- Language:
- English
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