Merge pull request #1443 from CEED/jrwrigh/riemann_slip

fluids: Change slip boundary condition formulation

fluids: Change -bc_slip_x -> -bc_symmetry_x

Merge pull request #1096 from CEED/leila/fluids-stab-coef

Fluids-newtonian: Stabilization coefficients dependent on polynomial degree

fluids: default q_extra = 0

Merge pull request #962 from CEED/jed/fluids-jacobian

examples/fluids: add analytic Jacobian

examples/fluids: fix sign and magnitude of channel flow body force

Add -body_force_scale, which can be -1 to test that a flow reversal
builds to the same steady profile with opposite sign.

I also c

examples/fluids: fix sign and magnitude of channel flow body force

Add -body_force_scale, which can be -1 to test that a flow reversal
builds to the same steady profile with opposite sign.

I also changed the domain size (reducing Reynolds number from 4500 to
45) so flow reversal can be observed reasonably quickly when desired.

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Merge pull request #958 from CEED/jed/fluids-cleaning

examples/fluids cleaning

examples/fluids: consolidate two-step setup

Contexts are created in one place now and we have removed duplicate
struct definitions for physics.

feat: Add blasius boundary layer and channel flow examples to examples/fluids (#942)

* examples/fluids: Upload current case for collaboration

* examples/fluids: Replace developing BL with duct

feat: Add blasius boundary layer and channel flow examples to examples/fluids (#942)

* examples/fluids: Upload current case for collaboration

* examples/fluids: Replace developing BL with duct

* examples/fluids: Allow density to "float" at inflow

* fix: Add u_normal

* examples/fluids: bug fix in density flux

* examples/fluids: implement "floating" pressure; prescribed u, T

* examples/fluids: fixing initialization

We need has_neumann=true to get the weak boundary integrals called. It
is initialized in problem->setup_ctx and used in SetupLibceed(). This is
a hack to always apply.

* examples/fluids: include kinetic energy in Blasius IC

* examples/fluids: Blasius quasi-2D (slip in z planes)

* feat: Add Exact_Channel function

* feat: Use Exact_Channel for IC and Inflow

* examples/fluids: Add channel example

* examples/fluids: Define mu in blasius.c, cleanup

* examples/fluid: Add Blasius solution calculator

* examples/fluids: Add blasius IC and BCs

* Convert to implicit TS

* examples/fluids: Update blasius.yaml

* Move to ChannelContext, refactor DC and newtonian

- Added a dedicated ChannelContext, which allows for user setting of
flow parameters and consistent sharing of parameters between
QFunctions (instead of hardcoding)
- Moved density current (DC) specific settings from newtonian.c
densitycurrent.c

* Make gravity into vector quantity

* Add in body force for channel

* examples/fluids: remove explicitly setting coordinate field

This is created automatically now by DMPlex and DMProjectCoordinates
breaks (localized) periodicity, resulting in a tangled mesh.

* examples/fluids: transpose flux Jacobian in SUPG stabilization

* examples/fluids: update docs commensurate with flux Jacobian transpose fix

* examples/fluids: work on docs for tau

* examples/fluids: Increase blasius Re, implement Xi to SUPG

- Increased the Uinf and mu by 4x for the blasius problem
- Implemented the calculation of Xi for the SUPG term in newtonian.h

* examples/fluids: Remove flux jacobian transpose

- Removed for both eulervortex.h and newtonian.h

* examples/fluids: Reset Newtonian unit scaling to neutral

- Note that this resets the scaling for the densitycurrent problem,
thus the examples (and possibly tests) will probably need to be
changed

* examples/fluids: fix PetscOptionsBegin for new PETSc

* feat: Add slanted domain top surface

* feat: Add graded mesh option for blasius

* fix: Correct inflow boundary condition handling

* feat: Move to blasius_context, add CLI options

* feat: Move Blasius to physical air properties

* fix: Blasius profile and mesh generation

- Add the correct float->int rounding
- Fix eta to a value after exceeding the table's bounds

fix: Add fix eta after exceeding table

* examples/fluids: Move to physical mu default, fix tests

* doc: Add minimum documentation for channel and blasius

* examples/fluids: Add primitive jacobian and tau

- Also add misc comments

* examples/fluids: propose alternative flux Jacobian via prim-to-conservative

* examples/fluids: Add PHASTA diagonal tau

* fix: Add back in timestep obtaining

* examples/fluids: Add analytic tractions to inflow and outflow

- This is a stop-gap until viscous flux can be computed properly on the
boundary from current solution.
- Tau constants in a state of flux still but this produced a decent v at
inflow and outflow, removing the steep dive caused by forcing
dv/dx=-du/dy from a zero traction of omission.

* examples/fluids: CLI options for diagonal c_tau's

* examples/fluids: Update dt via context labels

* feat: Add more blasius table points

* examples/fluids: Cleanup stab and adjust Ctau_E

* examples/fluids: Replace spatial tau with diagonal

* examples/fluids: Fix stab in Euler

- Initialize `stab` to zero, add sum over loop

* examples/fluids: Document diagonal tau formulation

* examples/fluids: Fix compiler warnings

* examples/fluids: check error codes and elide unused header

* examples/fluids: Correct blasius example CLI

- Also add mention of the `blasius.yaml` file

* examples/fluids: Add supg to default blasius.yaml

* examples/fluids: Use yaml for channel and blasius

- Instead of long CLI options
- Also cleaned up the yaml formatting
- Added Cartesian directions to the faceMarker names

* examples/fluids: Show example yamls in README

Co-authored-by: Jed Brown <jed@jedbrown.org>
Co-authored-by: Kenneth E. Jansen <Kenneth.Jansen@colorado.edu>

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