Multiscale analysis on cavitating flow

Yoichiro Matsumoto, Kohei Okita

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Cavitating flow is consisted of various scale phenomena such as each bubble motion and continuum bubbly flow. It is required to take those phenomena into account and to simulate those flows combining detail each bubble motion and wave phenomena in the cavitating bubbly flow. Reduced-order models are introduced to taken into account the compressibility of liquid and the internal phenomena of bubbles. The nonlinear behavior of the spherically symmetric bubble cloud is numerically investigated at various frequency and pressure amplitude conditions. As the result, when the amplitude of the pressure fluctuation is high enough to generate nonlinear waveform which has much higher harmonics components inside the cloud, the pressure wave strongly focuses at the cloud center. On the other hand, we apply our numerical simulation code with the bubble model for cavitating flows to predict the cavitation erosion in a centrifugal pump. The predicted high cavitation intensity area, which is estimated by analyzing the bubble pressure and bubble nuclei distribution in the flow, agrees well with the experimental erosion area.

Original languageEnglish
Title of host publication6th AIAA Theoretical Fluid Mechanics Conference
Publication statusPublished - 1 Dec 2011
Event6th AIAA Theoretical Fluid Mechanics Conference - Honolulu, HI, United States
Duration: 27 Jun 201130 Jun 2011

Publication series

Name6th AIAA Theoretical Fluid Mechanics Conference

Conference

Conference6th AIAA Theoretical Fluid Mechanics Conference
CountryUnited States
CityHonolulu, HI
Period27/06/1130/06/11

Cite this

Matsumoto, Y., & Okita, K. (2011). Multiscale analysis on cavitating flow. In 6th AIAA Theoretical Fluid Mechanics Conference (6th AIAA Theoretical Fluid Mechanics Conference).