Solidworks FLow Simulation - iterations??

Hi All,

I'm using solidworks to do convection heat transfer in the microcomputer. The problem is my understanding on the number of iterations.

2 simulations are done through 2 different setting on the iteration:

       1) goals convergence (result obtained as in Pic 1 attached - stop at iteration 56)

       2) maximum iterations = 42 (result obtained as in Pic 2 attached - stop at iteration 42)

How do I explain about the differences of data ( in this case temperature) at iteration 20 and iteration 30??

For goals convergence; what is mean by goal convergence?? is it equilibrium state/ condition??

This number of iterations are not explained about time, am I right?

Thanks

SolidworksFlow Simulation