# Selective radiation transfer in complex two- and three-dimensional geometry

# Main results

- At the Department of Physical and Chemical Mechanics MIPT on the basis of the Institute of Problems in Mechanics RAS named after A. Yu. Ishlinsky a two-dimensional code that allows to calculate radiation fluxes to the surface of bodies of complex shape is developed;
- The developed computer program allows one to carry out calculations on both structured and unstructured grids adapted to specific body geometry;
- The ASTEROID program is built into the computer code, which calculates the spectral properties of the absorbing medium and, accordingly, allows for a complete spectral calculation in a wide range of wave numbers;
- A short program operation time (spectral calculation is carried out in 30 minutes of computer time) is achieved by implementing radiation transfer in the P1 approximation of the spherical harmonics method.
- More information may be found in the book (in russian): Surzhikov S.T. Thermal radiation of gases and plasma, Moscow: BMSTU publishing, 2004. 544 p. (Computer models of physical mechanics).

# The results of the calculation of the radiation field in the vicinity of a spherical body upon re-entry into the atmosphere of Mars at a speed of 40 M

Temperature field at the surface of a spherical apparatus. Free flow parameters correspond to 42 seconds of MSRO spacecraft descent

Comparison of the spectral flux density to the surface of a sphere. The solid curve is the result of the P1 approximation, the dashed curve is the result of the discrete direction method

Volume density of radiation energy, erg/cm^{3}