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Cavitating Flows Simulation - Crossref

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Last Updated: 06 August 2022

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Numerical investigation of unsteady cavitating turbulent flows around a three-dimensional hydrofoil using stress-blended eddy simulation

One of the most promising research areas in cavitating flow is flow instability, which involves complex gas-u2013liquid interactions and multiscale vortical structures. The role of turbulence modeling is pivotal in the numerical investigation of unsteady flow characteristics. Our hybrid approach introduces a shielding function to link the RANS model and the LES in regions that are not widely distributed, such as large-scale separated flow areas. The SBES model's lift/drag coefficients, streamwise velocity profiles, and cavity profiles were in better agreement with the experimental results than those produced by the modified RANS model. The stretching and dilatation terms dominated the creation of vorticity around the hydrofoil, according to a further review of vorticity transportation. In conclusion, the SBES model can be used to forecast turbulent flows in practical engineering applications.

Source link: https://doi.org/10.1177/09544089211025119


Large eddy simulation of natural cavitating flows in Venturi-type sections

Cavitating flows can be used in a variety of industries. This gives LES an enhanced degree of RANS than RANS, but the required computational time for RANS is much shorter than for LES due to the time averaging process. The results of this research show that qualitative comparisons with earlier experimental findings and the simulated general cavitation behaviour correlate very well with experimental findings, and that simulations can be used to predict the cavitation cycle in more detail.

Source link: https://doi.org/10.1243/09544062jmes2036


A phenomenological bubble number density model developed for simulation of cavitating flows inside high-pressure diesel injection nozzles

Purpose u2013 Purpose u2013 The present study seeks to solve the calibration issue of cavitation bubble number density in simulations of the cavitation flows within the diesel injection nozzle holes using a two-fluid cavitation scheme. In addition, a phenomenological model for the number of cavitation bubbles that factor in the hydrodynamic effect has been created by the combined investigation of cavitation bubble dynamics and internal flow characteristics of diesel injection nozzle holes. The new cavitation bubble number density model, as well as this new cavitation bubble number density model, has the ability to expand the application range of the two-fluid cavitation model. The validation results reveal that the two-fluid cavitation model, as well as the number of cavitation content inside the diesel nozzle hole and the relationship between discharge coefficient and cavitation number, as well as the relationship between discharge coefficient and cavitation number, as well as the relationship between the two-valid cavitation nozzle hole and cavitation bubble number density model with the relationship between the cavitation bubble number of the relationship between the calibration bubble number of the two-fluid cavitation model's's.

Source link: https://doi.org/10.1108/hff-09-2011-0174

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions