Why I can't get the desired output when simulating this dc to dc converter circuit?
Assuming n0002 is the output, you may just have to wait a long long time for the simulator to simulate the complete turn-on transient.

It's even possible for the simulator to stall on certain switching circuits. How to avoid this is fairly tricky to predict. Given this is a TI part and an Analog Devices simulator, this kind of hang-up is more likely. 

You should try using TI's simulator (TINA-TI) instead. From the WebBench tool where you made your first schematic image, you can just click on an "export" button to generate the schematic for TINA-TI. But even that's no guarantee of success, as switching circuit turn-on transients can simply be difficult to simulate.