The ConservedLangevinNoise kernel uses a plugable user object that acts as the supplier for the random field. This system allows the generation of concentration conserving noise. This means the integral over the applied noise field is guaranteed to be zero. In phase field simulation this avoids a mass-conservation violating concentration drift. This kernel yields parallel reproducible results.
The available user objects that provide the noise field are
Here the Uniform stands for a uniform random number distribution, and the Normal stands for a Gaussian normal distribution. User objects with Masked in the name take a material property that is used as a spatially dependent multiplier for the noise field. This allows selective application of the noise in subregions of the sample (souch as grain boundaries) or a temperature dependent noise amplitude.