ConeNozzleInjection isn't uniform

The current implementation of the disk injection produces parcels which are more concentrated at the center of the disk (left plot). Whereas the expected distribution should be similar to the right plot.

This is a side effect of sampling along the radius and azimuth angle, specifically this line. Simply taking the square root of the random scalar should be sufficient to solve the issue. scalar frac = sqrt(rndGen.globalSample01<scalar>());. This post has a full explanation of this solution.