Numerical Multiscale Modeling of Fluid Flow Characteristics of Ultrasonically Processed A356 Alloys

摘要

The ultrasonic treatment (UST) technology was studied in this article to determine the fluid flow characteristics during molten metal and solidification processing of A356 alloys. The developed UST modeling approach is based on the numerical acoustic solution of Lilley model compressible fluid flow, heat transfer equations, and stochastic mesoscopic modeling of the microstructure evolution. The Noltingk-Neppiras model, which is a general case of a gas vapor-filled cavity in an acoustic field, is used to predict the cavity time evolution in an acoustic field. The UST modeling tool is capable to model acoustic streaming, cavitation and bubble dynamics. The predicted fluid flow characteristics include flow profile, velocity vectors and magnitude, pressure contours, streamlines, strain rates, and turbulent intensity.