Numerical FSI investigation based on LES: Flow past a cylinder with a flexible splitter plate involving large deformations (FSI-PfS-2a)

Rezazadeh

European Journal of Computational Mechanics

2017

This study investigates the fluid forces acting on a circular cylinder in a laminar flow regime while using a passive control strategy. Three cases including the cylinder with one, two or three rigid splitter plates attached at its rear surface were considered and the location of horizontal plates (attachment angle) was varied between 0̊ and 90. A comprehensive parametric study was performed to identify the optimum arrangement of the plates using the commercial finite element software, Comsol Multiphysics. The results show that the location and the number of the plates have crucial effects on the wake control. Increasing the number of splitter plates from one to two symmetric parallel plates led to a reduction in drag force, vortex shedding frequency and fluctuation of lift force. A maximum drag reduction of 23% for dual-splitters and 15% for single-splitter was achieved, at an angle of 45° at Reynolds number 100. However, increasing the number of attached plates to three didn't have a significant effect on flow quantities when plates of the same length were utilized. The suitability of the third plate (the middle plate) was further studied by investigating the effect of length of the plate on flow quantities.

Section: Introductionmentioning

confidence: 79%

Reduction of fluid forces and vortex shedding frequency of a circular cylinder using rigid splitter plates

Rezazadeh

European Journal of Computational Mechanics

2017

Numerical Meth Engineering

“…The amplitude of the deformation A def is set to a value much larger than what is expected in a real physical case in order to stress the robustness of the proposed hybrid method. A snapshot of the geometry and the flow is shown in Figure 15 problem are described in [1] and were validated by complementary experimental-numerical FSI investigations [2,3]. Figure 15(a) and (b) shows the vorticity magnitude of the turbulent flow around the rigid and the flexible hemisphere in two slices (y=D D 0,´=D D 0:014).…”

Section: Application Of the Hybrid Methods To A Real-life Fsi Problemmentioning

confidence: 91%

“…A snapshot of the geometry and the flow is shown in Figure at the time instant of the maximum deformation ( t = 2.5 × 10 − 4 s). The solver (FASTEST‐3D) and the techniques used to compute this FSI‐LES problem are described in and were validated by complementary experimental‐numerical FSI investigations .…”

Section: Application Of the Hybrid Methods To A Real‐life Fsi Problemmentioning

confidence: 99%

A fast and robust hybrid method for block‐structured mesh deformation with emphasis on FSI‐LES applications

Sen

Nayer

Breuer

2017

Summary The present work introduces an efficient technique for the deformation of block‐structured grids occurring in simulations of fluid–structure interaction (FSI) problems relying on large‐eddy simulation (LES). The proposed hybrid approach combines the advantages of the inverse distance weighting (IDW) interpolation with the simplicity and low computational effort of transfinite interpolation (TFI), while preserving the mesh quality in boundary layers. It is an improvement over the state‐of‐the‐art currently in use. To reach this objective, in a first step, three elementary mesh deformation methods (TFI, IDW, and radial basis functions) are investigated based on several test cases of different complexities analyzing not only their capabilities but also their computational costs. That not only allows to point out the advantages of each method but also demonstrates their drawbacks. Based on these specific properties of the different methods, a hybrid methodology is suggested that splits the entire grid deformation into two steps: first, the movement of the block‐boundaries of the block‐structured grid and second, the deformation of each block of the grid. Both steps rely on different methodologies, which allows to work out the most appropriate method for each step leading to a reasonable compromise between the grid quality achieved and the computational effort required. Finally, a hybrid IDW‐TFI methodology is suggested that best fits to the specific requirements of coupled FSI‐LES applications. This hybrid procedure is then applied to a real‐life FSI‐LES case. Copyright © 2016 John Wiley & Sons, Ltd.

Proc Appl Math and Mech

“…An open-source coupling software, called EMPIRE, takes care of the exchange between the fluid loads and the displacement of the structure and completes the computational methodology. The entire numerical framework was validated based on different geometrically 2D benchmarks [5,6] and is implemented on highperformance computers such as SuperMUC.…”

Section: Numerical Fsi-les Frameworkmentioning

confidence: 99%

Coupled Simulations Involving Light‐weight Structures within Turbulent Flows: A Complementary Experimental and Numerical Application

Nayer

Wood

Breuer

et al. 2018

Due to their easy-to-shape and light-weight characteristics, membranous structures are common in modern civil engineering. As all outside buildings they are exposed to wind loads and consequently undergo fluid-structure interactions (FSI). In order to dimension these membranous constructions and to avoid the damage of the material by FSI, numerical and experimental investigations are necessary. The current paper presents the simulation part of complementary experimental and numerical investigations relying on an advanced numerical simulation methodology.