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- `I`: inflow – fluid is allowed to flow inwards through the
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corresponding domain boundary but not to flow outwards. This
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means for the perpendicular velocity component
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*u*<sub>*o*</sub> = ± sgn *u*<sub>*i*</sub> ⋅ *u*<sub>*i*</sub>
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*u*<sub>*o*</sub>=± sgn*u*<sub>*i*</sub>⋅*u*<sub>*i*</sub>
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where the ’+’(’-’)-sign stands for a lower (upper) domain
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boundary. Zero derivative,
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*u*<sub>*o*</sub> = *u*<sub>*i*</sub>, is assumed for other
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*u*<sub>*o*</sub>=*u*<sub>*i*</sub>, is assumed for other
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cell-centroid quantities except the total energy density.
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The total energy density is set consistently under the
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assumption of a zero derivative for the thermal energy
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- `O`: outflow – fluid is allowed to flow outwards through the
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corresponding domain boundary but not to flow inwards. This
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means for the perpendicular velocity component
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*u*<sub>*o*</sub> = ∓ sgn *u*<sub>*i*</sub> ⋅ *u*<sub>*i*</sub>
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*u*<sub>*o*</sub>=∓sgn *u*<sub>*i*</sub>⋅*u*<sub>*i*</sub>
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where the ’+’(’-’)-sign stands for a lower (upper) domain
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boundary. Other variables are likewise to I.
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- `M`: mirror symmetry – reflecting conditions,
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*u*<sub>*o*</sub> = − *u*<sub>*i*</sub>, for the
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*u*<sub>*o*</sub>=−*u*<sub>*i*</sub>, for the
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perpendicular components of velocity and magnetic field and
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zero derivative for the other variables.
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- `A`: antimirror symmetry – same as M for non-magnetic
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variables. The magnetic field is forced to have dipole
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parity with respect to the domain boundary. This means
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*u*<sub>*o*</sub> = − *u*<sub>*i*</sub> for the parallel
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*u*<sub>*o*</sub>=−*u*<sub>*i*</sub> for the parallel
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magnetic field components and
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*u*<sub>*o*</sub> = *u*<sub>*i*</sub> for the perpendicular
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*u*<sub>*o*</sub>=*u*<sub>*i*</sub> for the perpendicular
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magnetic field component.
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- `R`: reflection-on-axis (only of relevance in cylindrical
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| ... | ... | @@ -320,13 +320,13 @@ for the type of coordinate system. |
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`_C.bc[2]`,`_C.bc[3]`) – reflecting conditions at the
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geometric axis. Same as M except for the azimutal magnetic
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field component for which
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*u*<sub>*o*</sub> = − *u*<sub>*i*</sub>.
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*u*<sub>*o*</sub>=−*u*<sub>*i*</sub>.
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- `C`: reflection-at-center (only of relevance in spherical
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geometry for `_C.bc[0]`) – reflecting conditions at the
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coordinate origin. Same as M except for the non-radial
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magnetic field components for which
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*u*<sub>*o*</sub> = − *u*<sub>*i*</sub>.
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*u*<sub>*o*</sub>=−*u*<sub>*i*</sub>.
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- `P`: periodicity – periodic conditions for all variables.
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| ... | ... | @@ -364,7 +364,7 @@ for the type of coordinate system. |
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- `_C.imr` (≤`MAXLEVEL`): maximal requested refinement level in a
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user-defined initially refined mesh (cf.
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[here](3.2-User-interfaces#user-defined-initial/restricted-mesh)).
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[here](3.2-User-interfaces#user-defined-initial/restricted-mesh-refinement)).
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`_C.imr` cannot be larger than the macro `MAXLEVEL` defined in
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the header file `nirvanaUser.h`.
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| ... | ... | |
