ESD capacitor simulation for human body model
Have you read this article from Texas Instruments ?

To test your ESD protection properly you need to create the correct pulse. This can be done using a circuit like this:


 ESD generator models according to HBM (left) and IEC 61000-4-2 (right)

As you can see the idea behind the Human Body ESD model is that a capacitor is charged to a certain voltage and that charged capacitor is then discharged (through a defined series resistor) through the device under test.

The discharge of the capacitor causes a current to flow and a voltage to develop across your DUT. You need to check if that current and voltage do not exceed the limits of what your DUT (the protection inside it) can handle. At least, that's how I simulate my ESD protections!

Your circuit will only briefly charge the capacitors, it does not simulate the high voltage discharge at all.