Difference between revisions of "Coupled multi-physics calculations"

From Serpent Wiki
Jump to: navigation, search
(Power relaxation)
Line 10: Line 10:
  
 
where <math>P^{n}</math> is the unrelaxed power distribution tallied on iteration <math>n</math>, <math>P_{\mathrm{rel}}^{n-1}</math> is the relaxed power distribution after the previous iteration, <math>s_{i}</math> is the active neutron population simulated on iteration <math>i</math> and <math>d</math> is an underrelaxation factor that can be defined by the [[Input syntax manual#set relfactor|set relfactor]] option.
 
where <math>P^{n}</math> is the unrelaxed power distribution tallied on iteration <math>n</math>, <math>P_{\mathrm{rel}}^{n-1}</math> is the relaxed power distribution after the previous iteration, <math>s_{i}</math> is the active neutron population simulated on iteration <math>i</math> and <math>d</math> is an underrelaxation factor that can be defined by the [[Input syntax manual#set relfactor|set relfactor]] option.
 +
 +
== Output ==

Revision as of 15:31, 1 December 2015

External coupling

Iteration

Power relaxation

Serpent relaxes the power distribution calculated in the iterations using the stochastic approximation based method, where the power distribution at iteration n is calculated by

P_{\mathrm{rel}}^{n} = P_{\mathrm{rel}}^{n-1} - \frac{s_{n}}{\sum_{i = 1}^{n} s_{n}} d \left(P_{\mathrm{rel}}^{n-1} - P^{n}\right),

where P^{n} is the unrelaxed power distribution tallied on iteration n, P_{\mathrm{rel}}^{n-1} is the relaxed power distribution after the previous iteration, s_{i} is the active neutron population simulated on iteration i and d is an underrelaxation factor that can be defined by the set relfactor option.

Output