find surface area of isosurface in Flow Sim

Is there a way to get the surface area of an isosurface in Flow Simulation? I am simulating converging-diverging nozzles with somewhat unusual geometries where it is hard to predict the the exact sonic line.  It would be convenient if Flow Simulation could calculate the surface area of the Mach 1 isosurface.  Thank you,

Adam

SolidworksSimulation