Application of Unsteady Fluid-Structure Methods to Problems in Aeronautics and Space

2003 ◽  
pp. 57-70 ◽  
Author(s):  
A. Dervieux ◽  
B. Koobus ◽  
E. Schall ◽  
R. Lardat ◽  
C. Farhat
Keyword(s):  
Fluid Structure ◽  
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.

A Volume-Force Synthetic Turbulence Approach For Modeling Unsteady Fluid-Structure Interactions

2017 ◽  
Author(s):  
Marina Kazarina ◽  
Shreman Parikh ◽  
Lap D. Nguyen ◽  
Vladimir V. Golubev ◽  
Miguel R. Visbal
Keyword(s):  
Fluid Structure Interactions ◽  
Fluid Structure ◽  
Volume Force ◽  
Unsteady Fluid

scholarly journals Unsteady Fluid–Structure–Jet Interactions of Agile High-Speed Vehicles

2018 ◽  
Vol 55 (5) ◽  
pp. 1111-1124
Author(s):  
Ryan C. Kitson ◽  
Carlos E. S. Cesnik
Keyword(s):  
High Speed ◽  
Fluid Structure ◽  
Unsteady Fluid ◽  
Jet Interactions
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