Maybe trying to pass 18A through 1A rated diodes - or the resistance of the transformer secondary losing 18V per Ohm.
Also be careful where you measure voltages between, the blue measurement point can only measure a valid voltage to the other side of the transformer secondary.
The peak voltage across the load, ignoring resistive losses is (Vrms * sqrt(2)) - (2 * Vf) where Vf is the forward voltage drop of one diode (assuming it isn't vaporized by the current!)
I believe that if your remove the ground from your primary (connect a 100G ohm resistor from PRI-SEC to have a path to ground), the circuit might do what you want.
I believe that if your remove the ground from your primary (connect a 100G ohm resistor from PRI-SEC to have a path to ground), the circuit might do what you want.
I wonder who you managed to get a transient simulation with so few points? Default PSpice settings will hardly produce it. Anyway, set minimal time step to e.g. 10 or 100 µs.
Secondly there's obviously an initial transient that didn't yet decay inside the displayed time interval. I presume the analysis starts at t= 0, show a longer time interval or start display after an initial delay.
Finally, please disclose the transformer parameters.
That's the formula for calculating the average voltage of a rectified sine without capacitor (but with resistive load).
With capacitor the formula is not true anymore.
Without resistive load the voltage may be floating between the peaks of the sine. A resistive load gives reliable results.
A scope picture should show.
In your scope picture you see only the first milliseconds after switch ON. But you can see the "unsymmetric" waveform becomes more and more symmetric. How does the waveform show after one second?
Unfortunately I overlooked the transformer specification in post #1.
Magnetizing inductance of 20 H isn't realistic but doesn't cause any problems.
There's apparently a hidden problem in the simulation setup, the results are completely implausible and can't be reproduced in a standard SPICE simulation, e.g. using LTspice.
This is your circuit and the settings. Looks like your filter is not very good one. Also the D1N4002 diodes did not gave good result (distorted output of transformer but not like your simulation... a trapezoid wave maybe) so I have changed them.