Fluid–Structure Interaction Simulation on Energy Harvesting From Vortical Flows by a Passive Heaving Foil

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Zhenglun Alan Wei ◽  
Zhongquan Charlie Zheng
Keyword(s):  
Energy Harvesting ◽  
Fluid Structure Interaction ◽  
Time Integration ◽  
Immersed Boundary ◽  
Fluid Structure ◽  
Periodic Response ◽  
Structure Interaction ◽  
First Order ◽  
Interaction Simulation ◽  
Ib Method

This study investigates energy harvesting of a two-dimensional foil in the wake downstream of a cylinder. The foil is passively mobile in the transverse direction. An immersed boundary (IB) method with a fluid–structure interaction (FSI) model is validated and employed to carry out the numerical simulation. For improving numerical stability, this study incorporates a modified low-storage first-order Runge–Kutta scheme for time integration and demonstrates the performance of this temporal scheme on reducing spurious pressure oscillations of the IB method. The simulation shows the foil emerged in a vortical wake achieves better energy harvesting performance than that in a uniform flow. The types of the dynamic response of the energy harvester are identified, and the periodic response is desired for optimal energy harvesting performance. Last, the properties of vortical wakes are found to be of pivotal importance in obtaining this desired periodic response.

scholarly journals An Improved Direct-Forcing Immersed Boundary Method for Fluid-Structure Interaction Simulations1

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Xiaojue Zhu ◽  
Guowei He ◽  
Xing Zhang
Keyword(s):  
Immersed Boundary Method ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Immersed Boundary ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Dimensional Flow ◽  
Boundary Method ◽  
Direct Forcing ◽  
Ib Method

In the present work, we present an improved version of the direct-forcing immersed boundary (IB) method proposed in Wang and Zhang (2011, “An Immersed Boundary Method Based on Discrete Stream Function Formulation for Two- and Three-Dimensional Incompressible Flows,” J. Comput. Phys., 230(9), pp. 3479–3499). In order to obtain an accurate prediction of local surface force, measures have been taken to suppress the unphysical spatial oscillations in the Lagrangian forcing. A fluid-structure interaction (FSI) solver has been developed by using the improved IB method for the fluid and the finite difference method for the structure. Several flow problems are simulated to validate our method. The testing cases include flows over a stationary cylinder and a stationary flat plate, two-dimensional flow past an inextensible flexible filament, and three-dimensional flow past a flapping flag. The results obtained in the present work agree well with those from the literature.

Sign in / Sign up

Export Citation Format

Share Document