Biglobal instabilities of compressible open-cavity flows

Biglobal Instabilities of Steady and Pulsatile Flows in a 75% Axisymmetric Stenotic Tube

Atherosclerosis, the formation of plaques within the arterial wall, continues to be a major cause of death in the developed world. The associated narrowing, or stenosis, of the artery can lead to potential significant restriction of blood flow to downstream vessels. Related to this condition is the potential of plaque ruptures and thrombosis formation leading to particles becoming lodged in sma...

Cavity flows of elastic liquids: Purely elastic instabilities

Experimental observations of a purely elastic flow instability occurring in the lid-driven cavity flow of two semi-dilute polymer solutions are reported and the effect of cavity aspect ratio on the dynamical structure of the unstable flow is quantitatively investigated. The spatial and temporal characteristics of the secondary flow are measured using flow visualization, laser Doppler velocimetr...

Three-dimensional instabilities in compressible flow over open cavities

Direct numerical simulations are performed to investigate the three-dimensional stability of compressible flow over open cavities. A linear stability analysis is conducted to search for three-dimensional global instabilities of the two-dimensional mean flow for cavities that are homogeneous in the spanwise direction. The presence of such instabilities is reported for a range of flow conditions ...

A Two -Step Modification toward Implementing Compressible Source Terms in Low Compressible Flows

Numerical Prediction of Interfacial Instabilities: The Sharp Interface Method for Compressible Flows

We introduce a new numerical method for solving the compressible Navier-Stokes equations in flow domains that may be separated by any number of interfaces, fluid-to-fluid or fluid-to-solid, at arbitrarily high density ratios and acoustic-impedance mismatch, and subjected to pressure waves of arbitrarily high amplitudes and steepness. A principal aim is the ab initio prediction of interfacial in...