Hi there. I am new to flow simulation. I am now doing circuit cooling simulation and having trouble with my power transistor thermal model. In the circuit , I am using a GaN mosfet chip(5mm*5mm*2mm  1.5Watt) and I am adding "typical chip array" materials to the mosfet chip. The mosfet has a temperature of 50 degrees in simulation, while in my lab experiment the mosfet has a temperature of 70 degrees. Maybe the thermal model of my mosfet may not be proper.   Could anyone please tell me your transistor model used for flow simulation? Thanks!