How to set to unsteady state
 

Hi

I'm now doing a heat transfer on a hollow core concrete block. I need to set the top concrete surface temperature to let say 30C and with a known thermal transfer rate the k value and also the heat grneration rate, so now I want to let it run and give me the bottom surface temperature. May I know how should I do it?

Furthermore, I would also like to know how to run the program at different time steps. Thank you so much

Yours Sincerely Cynthia