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 #1278 from CEED/jrwrigh/blasius-simplex

fluids: Fix STG and Blasius for non-box meshes

fluids: Use enum for mesh transformation flag

fluids: Explicit flag for blasius mesh modification

- So that blasius example can run using external meshes without any
attempt to modify them

Merge pull request #1286 from CEED/jrwrigh/refactor_gravity

fluids: Refactor gravity option

fluids: Refactor gravity option

- Use `-gravity` instead of `-g`
- Enforce that the input should be a length 3 vector
- Update documentation

Misc: Also update documented default value for `mu`.

Merge pull request #1133 from CEED/jed/fluids-riemann-outflow

Switch outflow from pressure to Riemann pressure + temperature

examples/fluids: Riemann outflow using pressure and temperature

* This allows stable sustained and transient recirculation.

* short-wake domain recirculation behind cylinder has sustained
rec

examples/fluids: Riemann outflow using pressure and temperature

* This allows stable sustained and transient recirculation.

* short-wake domain recirculation behind cylinder has sustained
recirculation. If the exterior temperature is different, the
recirculation will bring in the wrong temperature, but at least
it's stable.
* nwave with slow background causes transient flow reversal when
strong acoustic hits boundary.
* Clean outflow and lid for Blasius

* I tried the 2 P_ext - P_int strategy from Mengaldo (constant density)
and with specified exterior temperature, but they disrupted the interior
flow and were not significantly less reflective.

* The methods I tried for extrapolating interior temperature were not
stable. Simple extrapolation of velocity worked best, and did not show
signs of instability, perhaps because the neighboring flow and implicit
solve ties it together.

* This commit adds support for softmax control of recirculation, but the
parameters were finnicky, solver nonlinearity was a concern, and I'm not
convinced it's ever better than just allowing recirculation.

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

Fluids-newtonian: Stabilization coefficients dependent on polynomial degree

fluids: default q_extra = 0

Fluids - Blasius: Some Minor Modifications (#1063)

* Fluids - blasius: default T_wall = T_inf = 288

* Fluids - blasius: break when Chebyshev solve diverges

* Fluids - blasius: add prefix for C

Fluids - Blasius: Some Minor Modifications (#1063)

* Fluids - blasius: default T_wall = T_inf = 288

* Fluids - blasius: break when Chebyshev solve diverges

* Fluids - blasius: add prefix for Chebyshev snes solve

* Fluids - blasius: N_Chebyshev -> n_chebyshev

* Update examples/fluids/tests-output/blasius_test.yaml

Co-authored-by: Jed Brown <jed@jedbrown.org>

* Fluids - blasius: Modify the parameters in the regression test

* examples/fluids: Blasius solution is variable density

We use the ideal gas relation that density ~ 1/enthalpy when held at
constant pressure.

* examples/fluids: Blasius slower growth factor

* examples/fluids: fix Chebyshev on GPU

and close memory leak

Co-authored-by: Jed Brown <jed@jedbrown.org>

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Merge pull request #1059 from CEED/leila/fix-blasius-test

Fluids - Fix blasius test

Fluids - fix blasius test