add simple subsonic inflow/outflow BCs #598
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markkrumholz
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Apr 7, 2024
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This updates the shock-cloud problem to use a new setup that:
- tracks the cloud center-of-mass frame
- refines so that the cooling length $l_{\text{cool}} = c_s
t_{\text{cool}}$ is resolved with at least 10 cells
- adds derived fields for temperature, entropy, pressure, etc. to the
outputs
- uses the (simplified) Navier-Stokes Characteristic Boundary Conditions
for inflow/outflow on the left/right sides of the box
- adds shock-cloud problem to nightly regression testing
**This PR depends on:**
* #352
* #360
* #363
* #364
* #365
* #366
* #367
* #430
* #581
* #596
* #597
* #598
* #599
* #616
* #645
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Description
This adds simplified subsonic inflow and outflow boundary conditions. For outflows, it specifies the pressure at the outflow and extrapolates the other primitive variables (while turning into a reflecting boundary if the normal velocity is inflowing). For inflows, it specifies the velocity components, the temperature, and the passive scalars, while extrapolating the density.
Unlike the naive boundary conditions, these boundary conditions are well-posed, since they specify the correct number of quantities required for the steady-state solution to be unique. The amplitude of reflected waves is greater than for the NSCBC boundary conditions, but these boundary conditions are much more stable in the presence of supersonic turbulent flow near the boundary.
Related issues
Workaround for #532.
Checklist
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