Hi everyone. I am new to using this software and need some help please. I need to simulate a heat flow in a solid for a certain time. But after a while, I need that the convective heat flow to come from the opposite side, that is, to change the direction of the flow. The first part I already did. I was able to simulate the solid, and the initial conditions, however I don't know how to change the flow in a certain time. In other words, create another heat transfer, and stop the first flow. If you can help me or give me any ideas, I will be very grateful.
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