I'm trying to simulate STP55NF06. You can download its model here: STP55NF06 - N-channel 60 V, 0.015 Ohm, 50 A STripFET(TM) II Power MOSFET in TO-220 package - STMicroelectronics.
The pin 1,2, and 3 should be gate, drain, and source respectively. I connected a circuit like this, and got Vd = 12V. The Vd is supposed to be something near 0V. Is there anything wrong with the model?