5.2.2 Stability requirements

Stability requirements on radiation transport operator:

1. Stability of integration along ray (to avoid problems like in Sect. 2.2.2)
2. Stability of (accelerated) $\Lambda$ iteration
3. Stability of time-update

Note: Requirement 2 does not occur if the source function is independent of intensity (LTE).

Note: Requirement 1 does not occur if e.g. diffusion approximation is used.

Note: Requirement 3 is always there.

Sub-steps

time-step control