# Difference between revisions of "Coupled multi-physics calculations"

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== Power relaxation == | == Power relaxation == | ||

− | + | Serpent relaxes the power distribution calculated in the iterations using the stochastic approximation based method, where the power distribution at iteration <math>n</math> is calculated by | |

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+ | <math>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),</math> | ||

+ | |||

+ | 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. |

## Revision as of 13:35, 27 November 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 is calculated by

where is the unrelaxed power distribution tallied on iteration , is the relaxed power distribution after the previous iteration, is the active neutron population simulated on iteration and is an underrelaxation factor that can be defined by the set relfactor option.