(Young Scholar's Forum, Jun 15) Recent Developments in Diffusion-Based Acceleration Schemes for Neutron Transport Calculations
June 12,2018 17:54:53 readCount:25
Topic: Recent Developments in Diffusion-Based Acceleration Schemes for Neutron Transport Calculations
Speaker: Dr. Sicong Xiao(University of Massachusetts Lowell)
Venue: Room 625, Building No.30, Wushan Campus
Time: Friday, Jun 15, 2018, 9:00-10:00
 
[Abstract]
The numerical solution of neutron transport equations often requires acceleration techniques to improve its computational efficiency. Various acceleration methods have been developed in the last two decades. In the first part of this talk, I will briefly discuss one of the most popular acceleration methods, the coarse-mesh nonlinear diffusion acceleration (CM-NDA) technique, and its inherent unstable problem for the large optical thickness region. Then, two recently proposed new schemes, i.e., LR-NDA with local refinement technique and lpCMFD with linear prolongation technique, which can improve the stability and effectiveness of CMFD, will be presented and discussed. In the second part of this talk, another new effective acceleration scheme called DG-DSA, i.e., the linear diffusion synthetic acceleration based on discontinuous galerkin method will be discussed, including both its methodology and numerical performance.
 

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