Initialize turbulence var indices
Initialize turbulence var indices

Use invalid_var_index to initialize TurbulenceVariables.

nicholasmalaya/grins,vikramvgarg/grins,nicholasmalaya/grins,vikramvgarg/grins,nicholasmalaya/grins,vikramvgarg/grins,cahaynes/grins,cahaynes/grins,cahaynes/grins,vikramvgarg/grins,nicholasmalaya/grins,cahaynes/grins,cahaynes/grins,cahaynes/grins,vikramvgarg/grins,vikramvgarg/grins