The cavitation flow of linear-polymer solutions around a cylinder is studied by performing large-scale molecular dynamics simulation. addition polymer chains remarkably suppresses the cavitation. polymers are stretched into linear shape near and entrained in vortex behind cylinder. As stretch, elongational viscosity increases, which formation. Furthermore, exhibit an entropic elasticity owing t...

Abstract Cavitation is a phenomenon that occurs easily during rotation of fluid machinery and can decrease the performance pump, thereby resulting in damage to flow passage components. To study influence wall roughness on cavitation centrifugal three-dimensional model internal field pump was constructed numerical simulation conducted with ANSYS CFX software based Reynolds normalization group k ...

Cavitation and turbulence inside a diesel injector play a critical role in primary spray breakup and development processes. The study of cavitation in realistic injectors is challenging, both theoretically and experimentally, since the associated two-phase flow field is turbulent and highly complex, characterized by large pressure gradients and small orifice geometries. We report herein a compu...

This paper discusses our efforts to simulate large systems of bubbles in complex geometries, with specific application to modeling cavitation instabilities. An important unstable regime is the transition from sheet-to-cloud cavitation (SCC). Experiments performed by Callenaere et al. (2001) highlight the unsteady flow structures of SCC, which is characterized by unstable regions of vapor bubble...

Cavitation in a liquid moving past a constraint is numerically investigated by means of a free-energy lattice Boltzmann simulation based on the van der Waals equation of state. The fluid is streamed past an obstacle and, depending on the pressure drop between inlet and outlet, vapor formation underneath the corner of the sack-wall is observed. The circumstances of cavitation formation are inves...