Quantities of particles crossing a control volume are averaged and stored at the corresponding vertex. Due to the distribution of particle tracks in the domain this can result in non-contiguous vertex fields. The use of those vertex fields, for example in a CEL expression, could cause numerical problems. In these cases it may be helpful to smooth the particle vertex arrays. Only direct neighbors are involved in the smoothing process.

Once Vertex Variable Smoothing is selected, choose a smoothing Option: Raw (no smoothing) or Smooth.