A fully implicit combined field scheme for freely vibrating square cylinders with sharp and rounded corners

Jaiman, Rajeev K.; Sen, Sandeep; Gurugubelli, Pardha S.

doi:10.1016/j.compfluid.2015.02.002

Cited by 49 publications

(21 citation statements)

References 31 publications

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“…In the present study, the coupled fluid-rigid body simulations have been performed using the method proposed in Jaiman et al (2015). For the sake of completeness, the methodology is briefly discussed in this section.…”

Section: Numerical Methodologymentioning

confidence: 99%

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Freely vibrating circular cylinder in the vicinity of a stationary wall

Tham

Gurugubelli

Zhong

et al. 2015

Journal of Fluids and Structures

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Section: Numerical Methodologymentioning

confidence: 99%

“…The fullycoupled finite-element formulation and implementation are discussed in detail in Jaiman et al (2015). The kinematic compatibility at the interface is achieved by construction, which leads to a reduction in the size of the linear system solved per nonlinear iteration.…”

Section: Semi-discrete Petrov-galerkin Formulationmentioning

confidence: 99%

Freely vibrating circular cylinder in the vicinity of a stationary wall

Tham

Gurugubelli

Zhong

et al. 2015

Journal of Fluids and Structures

Self Cite

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“…The coupling scheme relies on a dynamic interface force sequence parameter to stabilize the coupled fluid-structure dynamics with strong inertial effects of incompressible flow on immersed solid bodies. The temporal discretizations of both the fluid and structural equations are formulated in the variational generalized-α framework and the systems of linear equations are solved via the Generalized Minimal Residual (GMRES) solver (Jaiman et al 2015(Jaiman et al , 2016b. The validation results of the two-and three-dimensional simulations are reported in Liu & Jaiman (2016), Mysa et al (2016) and Li et al (2016).…”

Section: Numerical Methodologymentioning

confidence: 99%

Dynamics and stability of gap-flow interference in a vibrating side-by-side arrangement of two circular cylinders

Liu

Jaiman

2018

J. Fluid Mech.

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In this work, the coupled dynamics of the gap flow and the vortex-induced vibration (VIV) on a side-by-side (SBS) arrangement of two circular cylinders is numerically investigated at moderate Reynolds number 100Re 800. The influence of VIV is incorporated by allowing one of the cylinders to freely vibrate in the transverse direction, which is termed as a vibrating side-by-side (VSBS) arrangement. A comparative analysis is performed between the stationary side-by-side (SSBS) and the VSBS arrangements to investigate the characteristics of the complex coupling between the VIV and the gap flow in a three-dimensional flow. The results are also contrasted against the isolated stationary and the vibrating configurations without any proximity and gap flow interference. Of particular interest is to establish a relationship between the VIV, the gap flow and the near-wake instability behind bluff bodies. We find that the kinematics of the VIV regulates the streamwise vorticity concentration, which accompanies with a recovery of two-dimensional hydrodynamic responses at the peak lock-in stage. On the other hand, the near-wake instability may develop around an in-determinant two-dimensional streamline saddle point along the interfaces of a pair of imbalanced counter-signed vorticity clusters. The vorticity concentration difference of adjacent vorticity clusters and the fluid momentum are closely interlinked with the prominence of streamwise vortical structures. In both SSBS and VSBS arrangements, the flip-flopping frequency is significantly low for the three-dimensional flow, except at the VIV lock-in stage for the VSBS arrangement. A quasi-stable deflected gap flow regime with negligible spanwise hydrodynamic (i.e., two-dimensional) response is found at the peak lock-in stage of VSBS arrangements. Owing to the gap-flow proximity interference, a high streamwise vorticity concentration is observed in its narrow near-wake region. The increase of the gap-flow proximity interference tends to stabilize the VIV lock-in, which eventually amplifies the spanwise correlation length and weakens the streamwise vortical structures. We employ the dynamic mode decomposition procedure to characterize the space-time evolution of the primary vortex wake.

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“…A monolithic approach can achieve good numerical stability for the aeroelastic problem with strong added mass effect, which assembles the fluid and structural equations into a single block then solves the coupled equations in a unified manner. However, it is difficult to take a full advantage of the existing stable and advanced fluid and struc-tural solvers, which restricts the scalability and flexibility of an aeroelastic framework [20,23,24]. Considering the drawbacks of a monolithic scheme, a partitioned approach is developed to employ the existing suitable fluid and structural solvers to solve the complex and generic aeroelastic problem.…”

Section: Aspects Of Computational Modelingmentioning

confidence: 99%

A novel 3D variational aeroelastic framework for flexible multibody dynamics: Application to bat-like flapping dynamics

Law

Jaiman

2019

Computers & Fluids

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We present a novel three-dimensional (3D) variational aeroelastic framework for flapping wing with a flexible multibody system subjected to an external incompressible turbulent flow. The proposed aeroelastic framework consists of a threedimensional fluid solver with a hybrid RANS/LES model based on the delayed detached eddy simulation (DDES) treatment and a nonlinear monolithic elastic structural solver for the flexible multibody system with constraints. Radial basis function (RBF) is applied in this framework to transfer the aerodynamic forces and structural displacements across the discrete non-matching interface meshes while satisfying a global energy conservation. For the consistency of the interface data transfer process, the mesh motion of the fluid domain with large elastic deformation due to high-amplitude flapping motion is also performed via the standard radial basis functions. The fluid equations are discretized using a stabilized Petrov-Galerkin method in space and the generalized-α approach is employed to integrate the solution in time. The flexible multibody system is solved by using geometrically exact co-rotational finite element method and an energy decaying scheme is used to achieve numerical stability of the multibody solver with constraints. A nonlinear iterative force correction (NIFC) scheme is applied in a staggered partitioned iterative manner to maintain the numerical stability of aeroelastic coupling with strong arXiv:1807.04411v1 [physics.flu-dyn] 12 Jul 2018 added mass effect. An isotropic aluminum wing with flapping motion is simulated via the proposed aeroelastic framework and the accuracy of the coupled solution is validated with the available experimental data. We next study the robustness and reliability of the 3D flexible multibody aeroelastic framework for an anisotropic flapping wing flight involving battens and membranes with composite material and compare against the experimental results. Finally, we demonstrate the aeroelastic framework for a bat-like wing and examine the effects of flexibility on the flapping wing dynamics.

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A fully implicit combined field scheme for freely vibrating square cylinders with sharp and rounded corners

Cited by 49 publications

References 31 publications

Freely vibrating circular cylinder in the vicinity of a stationary wall

Freely vibrating circular cylinder in the vicinity of a stationary wall

Dynamics and stability of gap-flow interference in a vibrating side-by-side arrangement of two circular cylinders

A novel 3D variational aeroelastic framework for flexible multibody dynamics: Application to bat-like flapping dynamics

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