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Hi erobz. Many thanks for your insight. Probabaly this paper will provide an ansewer. Yuan, G. Y., Ni, B. Y., Wu, Q. G., Xue, Y. Z., & Han, D. F. (2022). Ice breaking by a high-speed water jet impact. Journal of Fluid Mechanics, 934, A1. My aim was to find out the pressure on the wall to...

Hi, Case 1: Imagine a steady liquid water jet with unit cross sectional area - incompressible and inviscid. density D and uniform velocity V. Operating atmospheric pressure is 0.0 Pa. The jet is in air ( no air resistance ) and hits a stationary flat plate perpendicularly. Applying momentum...