Normalization of Variables

[erny123]

Hi all,

Is there any info on the normalization of variables? In the examples we just grab some equations using a function like LinearScalarAdvectionEquation2D(). But, for example, the Navier-Stokes equations require an input of the viscosity and Prandtl number:

CompressibleNavierStokesDiffusion2D(equations, mu = mu(),
                                                          Prandtl = prandtl_number(),
                                                          gradient_variables = GradientVariablesPrimitive())

Usually, you would normalize the Navier-Stokes equations given the viscosity and prandtl number so is this happening internally or do you initial conditions and any other input have to already be normalized?

[ranocha]

Trixi.jl does not enforce any special nondimensionalization. For example, the docstring of the compressible Navier-Stokes terms states that you can choose your favorite nondimensionalization - but you are responsible for making everything consistent.

Does this answer your question? If so, do you have suggestions how to improve the documentation to clarify this?