Vorticity and Turbulence Effects in Fluid Structure Interactions

2006 ◽  
Author(s):  
F. Trivellato
Keyword(s):  
Fluid Structure Interactions ◽  
Fluid Structure ◽  
Turbulence Effects

The Study of Fluid Structure Interactions of an Electroactive Membrane Wing

2012 ◽  
Author(s):  
Michael R. Hays ◽  
Adam Hart ◽  
William S. Oates ◽  
Lawrence Ukeiley
Keyword(s):  
Micro Air Vehicles ◽  
Control Device ◽  
Structural Deformation ◽  
Great Promise ◽  
Fluid Structure Interactions ◽  
Active Materials ◽  
Fluid Structure ◽  
Aerodynamic Loads ◽  
Turbulence Effects ◽  
Membrane Wing

Active materials, due to their intrinsic multi-functional material characteristics, have shown great promise for the improvement of agility and the mitigation of adverse turbulence effects for micro-air-vehicles (MAVs). One such subsection of active materials known as dielectric elastomers have demonstrated this multifunctional role by functioning as the wing surface and a boundary layer control device. In the past this material has shown that an increase in overall lift of 20% is possible and has the ability to delay stall by up to 5 degrees for an elliptical wing at a chord based Reynolds number of 63000. In order to better understand the effect of these fluid structure interactions, simultaneous time dependent structural deformation, aerodynamic loads, and flow velocities were measured and compared. These responses showed direct correlation between the applied electric field on the membrane wing and the aerodynamic loads and flow responses.

Fluid-Structure Interactions

2009 ◽  
Author(s):  
Michael Paidoussis ◽  
Stuart Price ◽  
Emmanuel de Langre
Keyword(s):  
Fluid Structure Interactions ◽  
Fluid Structure

FLUID-STRUCTURE INTERACTIONS SIMULATION AND VISUALIZATION USING ISPH APPROACH

2019 ◽  
Vol 26 (3) ◽  
pp. 223-238 ◽  
Author(s):  
A. Abdelnaim ◽  
M. Hassaballah ◽  
Abdelraheem M. Aly
Keyword(s):  
Fluid Structure Interactions ◽  
Fluid Structure

Experimental Mixing Parameterization Due to Multiphase Fluid � Structure Interactions

2010 ◽  
Vol 5 (2) ◽  
pp. 1-8
Author(s):  
Ranis N. Ibragimov ◽  
◽  
Akshin S. Bakhtiyarov ◽  
Margaret Snell ◽  
◽  
...  
Keyword(s):  
Fluid Structure Interactions ◽  
Fluid Structure ◽  
Multiphase Fluid

scholarly journals Cross-Flow Tidal Turbines with Highly Flexible Blades—Experimental Flow Field Investigations at Strong Fluid–Structure Interactions

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 797
Author(s):  
Stefan Hoerner ◽  
Iring Kösters ◽  
Laure Vignal ◽  
Olivier Cleynen ◽  
Shokoofeh Abbaszadeh ◽  
...  
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Cross Flow ◽  
Speed Ratio ◽  
Fluid Structure Interactions ◽  
Dimensional Parameter ◽  
Fluid Structure ◽  
Passive Flow Control ◽  
Tidal Turbines ◽  
Tidal Turbine

Oscillating hydrofoils were installed in a water tunnel as a surrogate model for a hydrokinetic cross-flow tidal turbine, enabling the study of the effect of flexible blades on the performance of those devices with high ecological potential. The study focuses on a single tip-speed ratio (equal to 2), the key non-dimensional parameter describing the operating point, and solidity (equal to 1.5), quantifying the robustness of the turbine shape. Both parameters are standard values for cross-flow tidal turbines. Those lead to highly dynamic characteristics in the flow field dominated by dynamic stall. The flow field is investigated at the blade level using high-speed particle image velocimetry measurements. Strong fluid–structure interactions lead to significant structural deformations and highly modified flow fields. The flexibility of the blades is shown to significantly reduce the duration of the periodic stall regime; this observation is achieved through systematic comparison of the flow field, with a quantitative evaluation of the degree of chaotic changes in the wake. In this manner, the study provides insights into the mechanisms of the passive flow control achieved through blade flexibility in cross-flow turbines.

Experimental observation of viscoelastic fluid–structure interactions

2017 ◽  
Vol 813 ◽  
Author(s):  
Anita A. Dey ◽  
Yahya Modarres-Sadeghi ◽  
Jonathan P. Rothstein
Keyword(s):  
Flow Instability ◽  
Reynolds Numbers ◽  
Time Dependent ◽  
Flexible Structure ◽  
Fluid Inertia ◽  
Fluid Structure Interactions ◽  
Periodic Oscillations ◽  
Fluid Structure ◽  
Dependent Growth ◽  
First Time

It is well known that when a flexible or flexibly mounted structure is placed perpendicular to the flow of a Newtonian fluid, it can oscillate due to the shedding of separated vortices. Here, we show for the first time that fluid–structure interactions can also be observed when the fluid is viscoelastic. For viscoelastic fluids, a flexible structure can become unstable in the absence of fluid inertia, at infinitesimal Reynolds numbers, due to the onset of a purely elastic flow instability. Nonlinear periodic oscillations of the flexible structure are observed and found to be coupled to the time-dependent growth and decay of viscoelastic stresses in the wake of the structure.

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