Anyone else playing around with the QRDude calculator? Or have done so in the past and have some experience with it?

I'm toying with the idea of a fractal (in the Diffractal) style 2D QRD panel in which the HF cutoff of the large pattern overlaps, matches, or is close to the LF diffusion cutoff of the smaller pattern, and in which the small pattern is meant to have a period width equal or smaller but very close to the column width of the larger panel.

I can't seem to get this to work out... probably a function of the mathematics but I want to make sure I'm not overlooking something. I started with 1D experimenting as that seemed easier but I have the same problem in 2D as well. What happens is that there is a gap between HF and LF cutoffs. As I try to extend the HF response of the large pattern it hits and passes the viscous limit, and as I try to lower the LF response of the small pattern its period width becomes too large to fit.

I'm wondering about implementing half round cylinders (or half-spheres?) on the tops of each block in a 2D panel with random orientation and perhaps size variation, but I have no idea what kind of periodicity problems this might create and I'm coming up predictably empty on being able to model the HF and LF cutoffs for such a hybrid system.

I'm toying with the idea of a fractal (in the Diffractal) style 2D QRD panel in which the HF cutoff of the large pattern overlaps, matches, or is close to the LF diffusion cutoff of the smaller pattern, and in which the small pattern is meant to have a period width equal or smaller but very close to the column width of the larger panel.

I can't seem to get this to work out... probably a function of the mathematics but I want to make sure I'm not overlooking something. I started with 1D experimenting as that seemed easier but I have the same problem in 2D as well. What happens is that there is a gap between HF and LF cutoffs. As I try to extend the HF response of the large pattern it hits and passes the viscous limit, and as I try to lower the LF response of the small pattern its period width becomes too large to fit.

I'm wondering about implementing half round cylinders (or half-spheres?) on the tops of each block in a 2D panel with random orientation and perhaps size variation, but I have no idea what kind of periodicity problems this might create and I'm coming up predictably empty on being able to model the HF and LF cutoffs for such a hybrid system.