This article deals with large-eddy simulations of three-dimensional incompressible laryngeal flow followed by acoustic simulations of human phonation of five cardinal English vowels, /ɑ, æ, i, o, u/. The flow and aeroacoustic simulations were performed in OpenFOAM and in-house code openCFS, respectively. Given the large variety of scales in the flow and acoustics, the simulation is separated into two steps: (1) computing the flow in the larynx using the finite volume method on a fine moving grid with 2.2 million elements, followed by (2) computing the sound sources separately and wave propagation to the radiation zone around the mouth using the finite element method on a coarse static grid with 33 000 elements. The numerical results showed that the anisotropic minimum dissipation model, which is not well known since it is not available in common CFD software, predicted stronger sound pressure levels at higher harmonics, and especially at first two formants, than the wall-adapting local eddy-viscosity model. The model on turbulent flow in the larynx was employed and a positive impact on the quality of simulated vowels was found.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1121/10.0017202 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Orientation effect and locational variation in elastic-plastic compressive properties of bovine cortical bone.
Proc Inst Mech Eng H
January 2025
Department of Mechanical Engineering, Chandigarh University, Mohali, Punjab, India.
Bone is a highly heterogeneous and anisotropic material with a hierarchical structure. The effect of diaphysis locations and directions of loading on elastic-plastic compressive properties of bovine femoral cortical bone was examined in this study. The impact of location and loading directions on elastic-plastic compressive properties of cortical bone was found to be statistically insignificant in this study.
View Article and Find Full Text PDFUniform dipole resonance and suppressed quadrupole resonance for constant transmittivity full phase control plasmonic metasurfaces.
Sci Rep
December 2024
Department of Electrical Engineering, Centre for NEMS and Nanophotonics (CNNP), Indian Institute of Technology Madras, Chennai, 600036, India.
Transmission-type plasmonic phase metasurfaces utilizing the Pancharatnam-Berry (PB) phase require constant transmittivity with complete phase variation from 0 to 2π. Usually, this is achieved by rotating metallic nanoparticles in an otherwise uniform lattice arrangement. However, this rotation and the chosen lattice structure cause a significant change in the transmittivity, resulting in a lower intensity of light with certain phases and a higher intensity for other phases.
View Article and Find Full Text PDFIntravascular Ultrasound Image-Based Finite Element Modeling Approach for Quantifying In Vivo Mechanical Properties of Human Coronary Artery.
J Vis Exp
December 2024
School of Biological Science and Medical Engineering, Southeast University; Mathematical Sciences Department, Worcester Polytechnic Institute.
Quantifying the mechanical properties of coronary arterial walls could provide meaningful information for the diagnosis, management, and treatment of coronary artery diseases. Since patient-specific coronary samples are not available for patients requiring continuous monitoring, direct experimental testing of vessel material properties becomes impossible. Current coronary models typically use material parameters from available literature, leading to significant mechanical stress/strain calculation errors.
View Article and Find Full Text PDFPolypeptide functionalized gold nanoprobes for SERS-fluorescence detection and imaging of caspase-9 during apoptosis.
Anal Chim Acta
January 2025
State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi, 214122, China; International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, 214122, China; Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, 214122, China.
Article Synopsis
- Deoxynivalenol (DON) is a common fungal toxin found in processed grain foods, associated with cytotoxic effects that lead to apoptosis and disrupt protein synthesis, making monitoring of caspase activity crucial.
- A novel gold nanoprobe designed for real-time detection of caspase-9 during DON-induced apoptosis was created, utilizing polypeptides and nanostars to enhance sensitivity and signal detection.
- This method allows for dual signal quantification and visualization of caspase-9 in living cells, advancing research on food safety and cellular mechanisms with applications across various human cell lines.
Deriving Chiroptical Properties from Intrinsically Achiral Building Blocks of One-Dimensional CsPbBr Perovskite Nanowires.
J Am Chem Soc
December 2024
School of Applied & Interdisciplinary Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
Chirality is a ubiquitous feature in biological systems and occurs even in certain inorganic crystals. Interestingly, some inorganic nanocrystals have been shown to possess chirality, despite their achiral bulk forms. However, the mechanism of chirality formation and chiroptical responses in such nanocrystals is still ambiguous due to the presence of chiral organic ligands used to passivate such nanocrystals.
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!