variable definition for non-reflective type of boundary conditions\n These boundary condition is taken from the paper:

```
S. Izquierdo and N. Fueyo,
"Characteristic nonreflecting boundary
conditions for open boundaries in lattice Boltzmann methods,"
Physical Review E, vol. 78, no. 46707, 2008.
```

Type | Visibility | Attributes | Name | Initial | |||
---|---|---|---|---|---|---|---|

real(kind=rk), | private | :: | kappa | specific heat ratio appears in eq 3: cs = sqrt( kappa * R * T ) |
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real(kind=rk), | private | :: | K_mod | from eq 17: k = sigma * ( 1 - Ma^2 ) * cs / L |
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real(kind=rk), | private | :: | cs_mod | used in eq 17 |
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real(kind=rk), | private | :: | sigma | used in eq 17 |
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real(kind=rk), | private | :: | lodi_length | length between inlet and outlet, represented by L in the paper |
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real(kind=rk), | private | :: | Ma_L | Lattice Mach number characterised by lattice flow velocity |