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TO-220 diode thermal simulation issue

Question asked by Chung Chihung on Apr 23, 2015
Latest reply on May 8, 2015 by Jared Conway

Hi guys, I started to simulate TO-220 diode with flow simulation recently. But the results have big different with experiment value. Following is condition: T ambient :50C , the power dissipation of diode is 1.5 watt. I don't know how to create the TO-220 model accurately. Do I need to create die ,copper,SiO2...etc. ? Is there anybody has experience with TO-220 thermal simulation? Please give me some suggest to figure out this tough issue. Thank you~

Attachment file is my simulation results.