Numerical Simulation on Stress Distribution of High Pressure Water Jet Impacting Solid Material

It is important to make sure the stress distribution in the media under high pressure water jet as to improve jets utilities. A numerical analyzing model of stress distribution about interaction of high pressure water jets impinging solid material is established according to fluid-structure interaction theory. Standard k-ε equations model and controlled volume method for the water jets, and elastic orthotropic continuum and finite element method for the solid are adopted. The stress distributions in the fluid field and inside solid material with different water jetting velocities were computed using the model and method. Numerical results show that the stress distributes obviously on the part solid material under water jets impingement. The impinging area is subjected to compression stress, and the maximum tensile stress is located on impacting surface and the maximum shear stress being under impacting center about half nozzle diameter away. It concludes that by controlling the jet velocity and distance, jet cutting, breaking, decoating, surface processing efficiencies could be improved.