Configuring transport options

[tommbendall]

How should transport options be configured in gusto?

Currently the default is for every variable to use DG upwind, and the forms for these are generated for the residual in the equations class. A specific time discretisation is then passed to the timestepper.

One suggestion is that the transport forms could be added as labels to the full equation. The equation could take transport_options as an argument, determining what forms to use for transport. However it seems the time discretisation still need to see these transport_options, which are used for the wrappers for embedded DG and recovered methods. This may not be very neat...

How do we best specify the forms used for the transport? i.e. upwind or average, what the integration by parts is, whether to add a vector manifold correction or not, etc.

Two other related issues are:

• organising the recovery methods, which are a general wrapper for different routines (e.g. diffusion or physics)
• how the linearisations are generated from the equations. What is the appropriate linearisation for transport terms? Presumably this shouldn't include the facet integrals.

[tommbendall]

This has been resolved by #382 !