scholarly journals Unsteady fluid-structure interactions in a soft-walled microchannel: A one-dimensional lubrication model for finite Reynolds number

2020 ◽  
Vol 5 (6) ◽  
Author(s):  
Tanmay C. Inamdar ◽  
Xiaojia Wang ◽  
Ivan C. Christov
Keyword(s):  
Reynolds Number ◽  
Fluid Structure Interactions ◽  
Fluid Structure ◽  
One Dimensional ◽  
Unsteady Fluid

scholarly journals Geometry of unsteady fluid transport during fluid–structure interactions

2007 ◽  
Vol 589 ◽  
pp. 125-145 ◽  
Author(s):  
ELISA FRANCO ◽  
DAVID N. PEKAREK ◽  
JIFENG PENG ◽  
JOHN O. DABIRI
Keyword(s):  
Fluid Transport ◽  
Recirculation Zone ◽  
Biological Fluid ◽  
Canonical System ◽  
Two Dimensional ◽  
Fluid Structure Interactions ◽  
Fluid Exchange ◽  
Fluid Structure ◽  
Ambient Flow ◽  
Unsteady Fluid

We describe the application of tools from dynamical systems to define and quantify the unsteady fluid transport that occurs during fluid–structure interactions and in unsteady recirculating flows. The properties of Lagrangian coherent structures (LCS) are used to enable analysis of flows with arbitrary time-dependence, thereby extending previous analytical results for steady and time-periodic flows. The LCS kinematics are used to formulate a unique, physically motivated definition for fluid exchange surfaces and transport lobes in the flow. The methods are applied to numerical simulations of two-dimensional flow past a circular cylinder at a Reynolds number of 200; and to measurements of a freely swimming organism, the Aurelia aurita jellyfish. The former flow provides a canonical system in which to compare the present geometrical analysis with classical, Eulerian (e.g. vortex shedding) perspectives of fluid–structure interactions. The latter flow is used to deduce the physical coupling that exists between mass and momentum transport during self-propulsion. In both cases, the present methods reveal a well-defined, unsteady recirculation zone that is not apparent in the corresponding velocity or vorticity fields. Transport rates between the ambient flow and the recirculation zone are computed for both flows. Comparison of fluid transport geometry for the cylinder crossflow and the self-propelled swimmer within the context of existing theory for two-dimensional lobe dynamics enables qualitative localization of flow three-dimensionality based on the planar measurements. Benefits and limitations of the implemented methods are discussed, and some potential applications for flow control, unsteady propulsion, and biological fluid dynamics are proposed.

scholarly journals Fluid–Structure Interactions and Unsteady Kinematics of a Low-Reynolds-Number Rotor

AIAA Journal ◽  
2020 ◽  
Vol 58 (2) ◽  
pp. 955-967
Author(s):  
Antonio Alguacil ◽  
Thierry Jardin ◽  
Nicolas Gourdain
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Fluid Structure Interactions ◽  
Fluid Structure ◽  
Low Reynolds

scholarly journals Energy-based fluid–structure model of the vocal folds

2020 ◽  
Author(s):  
Luis A Mora ◽  
Hector Ramirez ◽  
Juan I Yuz ◽  
Yann Le Gorec ◽  
Matías Zañartu
Keyword(s):  
Energy Exchange ◽  
Vocal Folds ◽  
Structure Model ◽  
Fluid Structure Interactions ◽  
Lumped Mass ◽  
Relevant Research ◽  
Mass Model ◽  
Fluid Structure ◽  
One Dimensional ◽  
Lumped Elements

Abstract Lumped elements models of vocal folds are relevant research tools that can enhance the understanding of the pathophysiology of many voice disorders. In this paper, we use the port-Hamiltonian framework to obtain an energy-based model for the fluid–structure interactions between the vocal folds and the airflow in the glottis. The vocal fold behavior is represented by a three-mass model and the airflow is described as a fluid with irrotational flow. The proposed approach allows to go beyond the usual quasi-steady one-dimensional flow assumption in lumped mass models. The simulation results show that the proposed energy-based model successfully reproduces the oscillations of the vocal folds, including the collision phenomena, and it is useful to analyze the energy exchange between the airflow and the vocal folds.

Sign in / Sign up

Export Citation Format

Share Document