AI Article Synopsis
- Numerical modeling of cavitating bubbly flows is complex due to the vast differences in size between microbubbles and larger structures like propellers.
- A multiscale approach is introduced, combining a Discrete Singularities Model (DSM) for small bubbles and a two-phase Navier Stokes solver for larger gas pockets, using a level set method for better representation.
- This model effectively demonstrates its utility in simulating various cavitation scenarios, such as initiation in vortex flows and cavitation around hydrofoils and propellers.
Article Abstract
Numerical modeling of cavitating bubbly flows is challenging due to the wide range of characteristic lengths of the physics at play: from micrometers (e.g., bubble nuclei radius) to meters (e.g., propeller diameter or sheet cavity length). To address this, we present here a multiscale approach which integrates a Discrete Singularities Model (DSM) for dispersed microbubbles and a two-phase Navier Stokes solver for the bubbly medium, which includes a level set approach to describe large cavities or gaseous pockets. Inter-scale schemes are used to smoothly bridge the two transitioning subgrid DSM bubbles into larger discretized cavities. This approach is demonstrated on several problems including cavitation inception and vapor core formation in a vortex flow, sheet-to-cloud cavitation over a hydrofoil, cavitation behind a blunt body, and cavitation on a propeller. These examples highlight the capabilities of the developed multiscale model in simulating various form of cavitation.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5927377 | PMC |
| http://dx.doi.org/10.1016/j.compfluid.2016.12.010 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Multifactorial Analysis of the Collapse Process of Double Bubbles Based on the Coarse-Grained Force Field in Free Domain.
Langmuir
January 2025
Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China.
Cavitation has been a hot research topic for scholars in various fields because of the intense mechanical, chemical, and thermal effects of bubble collapse. It forms a cluster of bubbles, and the bubbles will affect, interfere with, and couple with each other. To grasp the main factors affecting bubble collapse and the interbubble mechanism, the paper adopts the molecular dynamics simulation combined with the coarse-grained force field to study the collapse process of the double bubble model and takes the dynamic shape change of the bubbles, the local velocity distribution, and the local pressure distribution as the object to summarize the position angle, the shock velocity, and the bubble distance on the collapse law and the primary and secondary influence relationship and then reveals the interbubble mechanism.
View Article and Find Full Text PDFIntroduction: This study examined the association between cardiovascular disease (CVD) history and their dental caries experience status.
Methods: Conducted from January 2021 to June 2023, this cross-sectional cohort study involved 7,138 participants who underwent oral examinations. Data on demographic background, oral health-related behaviors, and smoking status were collected using a structured questionnaire.
Calibration correction to improve registration during cone-beam CT guided histotripsy.
Med Phys
January 2025
Department of Radiology, University of Wisconsin-Madison, Madison, Wisconsin, USA.
Background: Histotripsy is a non-invasive, non-ionizing, non-thermal focused ultrasound technique. High amplitude short acoustic pulses converge to create high negative pressures that cavitate endogenous gas into a bubble cloud leading to mechanical tissue destruction. In the United States, histotripsy is approved to treat liver tumors under diagnostic ultrasound guidance but in initial clinical cases, some areas of the liver have not been treated due to bone or gas obstructing the acoustic window for targeting.
View Article and Find Full Text PDFUltrasound-Guided Histotripsy Triggers the Release of Tumor-Associated Antigens from Breast Cancers.
Cancers (Basel)
January 2025
Department of Internal Medicine, Michigan Nanotechnology Institute for Medicine and Biological Sciences, University of Michigan, Ann Arbor, MI 48109, USA.
There is increasing evidence to indicate that histotripsy treatment can enhance the host anti-tumor immune responses both locally at the targeting tumor site as well as systemically from abscopal effects. Histotripsy is a non-invasive ultrasound ablation technology that mechanically disrupts target tissue via cavitation. A key factor contributing to histotripsy-induced abscopal effects is believed to be the release of tumor-specific antigens (TSAs) or tumor-associated antigens (TAAs) that induce a systemic immune response.
View Article and Find Full Text PDFProcess, dynamics and bioeffects of acoustic droplet vaporization induced by dual-frequency focused ultrasound.
Ultrason Sonochem
January 2025
Acoustic droplet vaporization (ADV) plays a crucial role in ultrasound-related biomedical applications. While previous models have examined the stages of nucleation, growth, and oscillation in isolation, which may limit their ability to fully describe the entire ADV process. To address this, our study developed an integrated model that unifies these three stages of ADV, stimulated by a continuous nonlinear dual-frequency ultrasound wave.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!