Hello, I wish to model with Comsol a simple situation: a plasterboard undergoes locally with one 3 ms duration a very short flash (Dirac) and I would like to see the evolution during the time of the wave of heat through volume. The problem it is that I do not know how to enter a function describing during time the flow received by my field. In which menu of Comsol is necessary it to go? Help me because it is very important. Thank you.