Cavity radiation heat transfer

Hi there!

im trying to run heat transfer by radiation from a heater to a rectangular curved block. The heater is placed inside a hole in the block. There is a gap of 1mm bw the heater and the wall of the hole.

could someone pleaseee help me out how to setup the case? Seems like i have tried everything, but nothing is working.

BC: 1. Heater is at constant temperature. BC:2 block initial temperature is 30deg. (any data is ok).

i request someone to run a case with my materials data that i have created (for some reason, Al6061-T4 is not working, but Al6061-T6 is working, all units are ok)

Can you share your .pmx file (with what you have so far) or at least the geometry in .step format ?