Approaches to radiative heat transfer simulation in a cavity above melt Ivan Melnikov, Gleb Shmelkov, Maksim Golubev, Aleksandr Velikanov, Yury Shmelkov and Sergey Savekin E3S Web Conf., 459 (2023) 07011 Published online: 04 December 2023 DOI: 10.1051/e3sconf/202345907011