I should see Vz=8.2V but it is calculated as 0.47V.
I made the same simulation in LTSpice with the same zener spice model, it gave correct result.
There must be something that I am missing but what ? Any help I appreciate it.
Try reversing the Zener diode in KiCad. As far as I remember, the pin assignment between the default Kicad model and LTSpice is reversed. Alternatively, try to use the Simulation Diode in Kicad, which has the pins in LTSpice order.
No, I don’t think so. It’s neither squares nor circles and the color is different from what would be “suspicious graphics”. It looks more like text. But, to be sure, you can drag the GND symbol check that the wire stays attached, and then press [Esc] to cancel the drag and put it back where it was.
A general tip when you want to do simulation:
Always tick the “Show pin numbers” field for every device. You’ll find it immensely helpful.
Another tip: most diode symbols have pin 2 for anode and pin 1 for cathode.
Ngspice expects exactly the opposite. Use the “Alternative node sequence” to change this.
Third tip: for Zeners it’s exactly the same. Ngspice expects anode and cathode in that sequence NOT positive and negative terminal.