S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Energy Systems Engineering (에너지시스템공학부) Nuclear Engineering (원자핵공학전공) Journal Papers (저널논문_원자핵공학과)
Cell based CMFD formulation for acceleration of whole-core method of characteristics calculation
- Cho, Jin Young; Joo, Han Gyu; Kim, Kang Seog
- Issue Date
- 한국원자력학회 = Korean Nuclear Society
- J. Korean Nuc. Soc.. 34, 250 (2002).
- This paper is to apply the well-established coarse mesh finite difference (CMFD) method to the method of characteristics (MOC) transport calculation as an acceleration scheme. The CMFD problem is first formulated at the pin-cell level with the multi-group structure. To solve the cell-based multi-group CMFD problem efficiently, a two-group CMFD formulation is also derived from the multi-group CMFD formulation. The performance of the CMFD acceleration is examined for three test problems with different sizes including a realistic quarter core PWR problem. The CMFD formulation provides a significant reduction in the number of ray tracings and thus only about 9 ray tracing iterations are enough for the realistic problem. In computing time, the CMFD accelerated case is about two or three times faster than the coarse-mesh rebalancing (CMR) accelerated case.