Studying the Function of the SideDiffusiveFluxIntegral PostProcessor

[TLWise]

For the SideDiffusiveFluxIntegral postprocessor a variable like vel_x is required. I have looked at the various associated .h and .C files and I do not see where the input for the variable is declared and applied. Which code file is the input and processor for the variable?

[GiudGiud]

Hello

The SideIntegralVariablePostprocessor is the base class of SideDiffusiveFluxIntegral that actually adds the variable parameter and processes it. It can then be used as an attribute in SideDiffusiveFluxIntegral.

The variable probably wont be 'vel_x' though, velocities are generally not "diffused"