Unfortunately your simulation is based on Huygens principle (1700s?) and while brilliant at the time it does not tell the proper story for matter waves. The simulation above is only relevant for light waves.
For single slit diffraction of water NO interference is observed, in many poor online water tank videos interference is due to reflections from the sides and other anomalies. Check your 1st year physics text book ... interference with water is only shown for 2 slits, never 1.
https://esfsciencenew.wordpress.com/2009/03/26/diffraction-wave-spreading-around-an-edge/
https://www.fizzics.org/wp-content/uploads/2019/02/Screenshot-2019-02-02-at-08.59.42.png
