An adaptive Runge-Kutta-Fehlberg method for time-dependent discrete ordinate transport

Time-dependent;Discrete ordinates;Neutron transport;Reactor transients

Edgar, Christopher A. ; Rahnema, Farzad Mechanical Engineering Haghighat, Alireza Petrovic, Bojan Yi, Ce Costello, Mark Sjoden, Glenn E. ; Rahnema, Farzad

University:Georgia Institute of Technology

Department:Mechanical Engineering

关键词: Time-dependent;    Discrete ordinates;    Neutron transport;    Reactor transients;   

Others  :  https://smartech.gatech.edu/bitstream/1853/53935/1/EDGAR-DISSERTATION-2015.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

This dissertation focuses on the development and implementation of a new method to solve the time-dependent form of the linear Boltzmann transport equation for reactor transients. This new method allows for a stable solution to the fully explicit form of the transport equation with delayed neutrons by employing an error-controlled, adaptive Runge-Kutta-Fehlberg (RKF) method to differentiate the time domain. Allowing for the time step size to vary adaptively and as needed to resolve the time-dependent behavior of the angular flux and neutron precursor concentrations. The RKF expansion of the time domain occurs at each point and is coupled with a Source Iteration to resolve the spatial behavior of the angular flux at the specified point in time. The decoupling of the space and time domains requires the application of a quasi-static iteration between solving the time domain using adaptive RKF with error control and resolving the space domain with a Source Iteration sweep. The research culminated with the development of the 1-D Adaptive Runge-Kutta Time-Dependent Transport code (ARKTRAN-TD), which successfully implemented the new method and applied it to a suite of reactor transient benchmarks.