1.4.5 Coupling of radiation transport and hydrodynamics

Radiation transport $\rightarrow$ hydrodynamics:

• affects energy and momentum
• non-local coupling
• possibly short radiative time-scale $\rightarrow$ stiff terms

Hydrodynamics $\rightarrow$ radiation transport:

• transport through complex 3D structures
• spatial fluctuations of $\rho$ and $e_{\rm i}$ $\rightarrow$ fluctuations of opacities and source function
• Doppler shifts of wavelengths of lines