This paper conducts a parametric investigation on whether the fountain effect in dual rotor/wing interaction exists at low disk loading and Reynolds number (disk loading < 100 N/m^2 and Reynolds number < 100,000). A commercial computational fluid dynamics package specifically developed for rotorcraft studies, RotCFD, in which the rotor is modeled as a distribution of momentum sources, was used. Numerical results are compared to an experimental study including force measurements and surface pressure measurements. The comparisons are employed to assess the accuracy of RotCFD results and help evaluate the formation of the fountain effect and its effect on rotor thrust and download force on the wing.