[NotOsborneReynolds]

Is there some trick to using Design Parameters in, for example, the Reference Length input to the Nusselt Number field function? I'm using my ${WallTemperature} global Parameter for its Reference Temperature, but don't seem to be able to do the same thing with my $PlateSpacing Design Parameter for its Reference Length. I've tried adding curly braces {} but that's not it.

Maybe Design Parameters can only be used as CAD dimensions, and not elsewhere?

My workaround is that I created a Design Parameter named PlateSpacing and then a global Parameter named PlateSpacingCopy, and I keep track of them on my own, but it's klunky.

Thank you!