Transition to turbulence in pulsatile pipe flow is of interest in a variety of biological flow domains including in the left ventricle and aorta, aneurysms, and stenotic vessels. Transitional flow can critically alter distributions of important hemodynamic parameters such as wall shear stress (WSS). Many previous...
Proper orthogonal decomposition (POD) is often used to remove experimental or measurement noise from velocity fields by producing a reduced order model (ROM) of the dataset. The accuracy of POD is primarily governed by the choice of which POD “modes” to use when reconstructing the...
Silicone Sylgard 184 (PDMS) is commonly used when manufacturing geometries for bioflow studies due to its optical transparency and compliant nature. However, for use with particle image velocimetry (PIV), a suitable blood analog working fluid is needed which both matches the physical properties of blood...
4D flow magnetic resonance imaging (MRI) allows for in vivo acquisition of time-resolved three-dimensional (3D) blood flow, thus enabling quantitative analysis of volumetric, time-varying hemodynamic quantities such as flow rates, wall shear stress (WSS), pressure difference, etc. 4D flow MRI is based on the phase...
The value of the flowing soap film as an experimental platform depends on its ability to approximate the two-dimensional Navier-Stokes equation. A variety of experimental techniques have been applied to characterize the soap film patterns, with the measured quantities being the thickness and the velocity...
We gladly welcome 4 additional Ph.D. students into our group to work on exciting and intriguing fluid mechanics problems. Welcome Luis Sanjuan, Rudra Sethi, Ruhi Sharmin and Shailee Mitra. ...
We had a wonderful lab outing with great food and company to celebrate various achievements of the lab including the graduation of Lalit, Sreyashi and Brett. Sreyashi with her graduation card ...
B-mode Speckle Tracking Echocardiography (STE) estimates the change in myocardial tissue length during a heartbeat. Commercial STE software use block-matching to track local speckle patterns and advect hand-drawn boundaries through these tracks to estimate length change. Strain is gaining adoption as a clinical metric for...
Echocardiogram Particle Image Velocimetry (echoPIV) is an emerging method for cardiac flow visualization. EchoPIV tracks acoustic-opaque bubbles introduced into the blood stream using block-matching methods. Despite increased interest, echoPIV is not routinely performed, as contrast enhancement is not clinically indicated unless initial image quality is...
Visualization and quantitation of multi-directional cardiovascular flow without the need for sedation or contrast is desirable across all practices of cardiology. Intraventricular flow mapping (iVFM) is one such method for multi-direction visualization. iVFM estimates the transverse flow from color Doppler ultrasound using the continuity equation....