Modeling of Spatial Uncertainties in the Magnetic Reluctivity
  In this paper a computationally efficient approach is suggested for the stochastic modeling of an inhomogeneous reluctivity of magnetic materials. These materials can be part of electrical machines, such as a single phase transformer (a benchmark example that is considered in this paper). The approach is based on the Karhunen-Lo\`{e}ve expansion. The stochastic model is further used to study the statistics of the self inductance of the primary coil as a quantity of interest. 
Radoslav Jankoski and Ulrich R\"omer and Sebastian Sch\"ops
cs.CE math.NA