Heat Source Location
In Aavid Genie, you can add devices to your heat sink before simulating thermal performance. Aavid Genie has a graphical user interface (GUI) for heat source placement on your heat sink, but an important thing to consider is how your heat sink is oriented in relation to the GUI.
Your heat sink base touches your screen, with the flow length as the vertical dimension.
If you take a heat sink resting on your desk with the base resting on the surface, pick it up, make sure the fins are oriented vertically and press it to the screen where the GUI is, that’s how your heat sources and heat sink are placed in relation to each other.