# Coupled multi-physics calculations

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Revision as of 13:33, 3 December 2015 by Ville Valtavirta (Talk | contribs)

## External coupling

## Iteration

## Multi-physics interface

## Power relaxation

Serpent relaxes the power distribution calculated in the iterations using the stochastic approximation based method^{[1]}, 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.