Colbhaidh
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Scotland
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For simulating a fuse, assuming your CFD is properly simulating the temperature of the metal line, then the point it fuses is when the temperature causes the metal to flow (melt). This depends on the metal, the metal stack (e.g. for aluminium track, it will be composed of for example 20nm Ti/ 45nm TiN/ 0.6um Al-Cu/ 45nm TiN). The simulator will not simulate the actual fusing of the track so you need to find out the critical temperature for your metal line.
By the way, you do not need an opening above a poly fuse. The poly will melt while contained by the dielectric and still fuse reliably. The only thing not to do with a poly fuse is run metal over the top of it.
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