Flow reproduction using Vortex Particle Methods for simulating wake buffeting response of bluff structures

Chawdhury, Samir; Morgenthal, Guido

doi:10.1016/j.jweia.2016.02.003

Cited by 15 publications

(7 citation statements)

References 22 publications

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“…The section forces for aerodynamic analysis can be calculated by integrating pressures on the surface panels. More details about the solver can be found in [8,9] while its specific implementations can be found in [10,14,15,13,16].…”

Section: A Pseudo-3d Algorithm For Fluid-structure Interaction 21 Flmentioning

confidence: 99%

A Pseudo Three-Dimensional Multi-Slice Numerical Model to Simulate Wind-Induced Vibration of Thin-Walled Roof Systems

Chawdhury¹,

Morgenthal²

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Section: A Pseudo-3d Algorithm For Fluid-structure Interaction 21 Flmentioning

confidence: 99%

A Pseudo Three-Dimensional Multi-Slice Numerical Model to Simulate Wind-Induced Vibration of Thin-Walled Roof Systems

Chawdhury¹,

Morgenthal²

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Eq. 21) was validated on an actual 2D flow, represented by the numerical solution of the Navier-Stokes equations in [37]. Therein, the velocity field was recorded at a ladder, positioned in the wake of a bluff body.…”

Section: Velocity-based Turbulence Generationmentioning

confidence: 99%

“…is larger than 3×3, the factor βπ/2 → 1. Furthermore, Chawdhury and Morgenthal in [37] used the method for conversion of ladder velocities into particles to reproduce a wake behind a bluff body where the velocities sampled on the ladder are obtained from the solution of the Navier-Stokes equation. The factor β is reported to be around 0.6 to match the reproduced flow turbulence properties.…”

Section: Flow Verificationmentioning

confidence: 99%

Aeroelastic analyses of bridges using a Pseudo-3D vortex method and velocity-based synthetic turbulence generation

Kavrakov

Morgenthal

2018

Engineering Structures

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The accurate representation of aerodynamic forces is essential for a safe, yet reasonable design of long-span bridges subjected to wind effects. In this paper, a novel extension of the Pseudo-three-dimensional Vortex Particle Method (Pseudo-3D VPM) is presented for Computational Fluid Dynamics (CFD) buffeting analysis of line-like structures. This extension entails an introduction of free-stream turbulent fluctuations, based on the velocity-based turbulence generation. The aerodynamic response of a longspan bridge is obtained by subjecting the 3D dynamic representation of the structure to correlated free-stream turbulence in twodimensional (2D) fluid planes, which are positioned along the bridge deck. The span-wise correlation of the free-stream turbulence between the 2D fluid planes is established based on Taylor's hypothesis of frozen turbulence. Moreover, the application of the laminar Pseudo-3D VPM is extended to a multimode flutter analysis. Finally, the structural response from the Pseudo-3D flutter and buffeting analyses is verified with the response, computed using the semi-analytical linear unsteady model in the time-domain. Meaningful merits of the turbulent Pseudo-3D VPM with respect to the linear unsteady model are the consideration of the 2D aerodynamic nonlinearity, nonlinear fluid memory, vortex shedding and local non-stationary turbulence effects in the aerodynamic forces. The good agreement of the responses for the two models in the 3D analyses demonstrates the applicability of the Pseudo-3D VPM for aeroelastic analyses of line-like structures under turbulent and laminar free-stream conditions.

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“…Recent progress in the development of discrete vortex methods has particularly concentrated on improvements in the accuracy of numerical results and the high resolution of wake fields [7][8][9][10][11][12][13][14][15][16]. Some of the literature has also focused on the extension of the vortex method, such as solving structural deformations via coupling with the finite element method [17][18][19][20][21]. In vortex methods, vortices already in the fluid can leak into the body owing to random walk, which causes serious damage to the streamlined body surface.…”

Section: Introductionmentioning

confidence: 99%

Conformal Mapping-Based Discrete Vortex Method for Simulating 2-D Flows around Arbitrary Cylinders

Guo

Sun

Zong

et al. 2021

JMSE

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A novel technique based on conformal mapping and the circle theorem has been developed to tackle the boundary penetration issue, in which vortex blobs leak into structures in two-dimensional discrete vortex simulations, as an alternative to the traditional method in which the blobs crossing the boundary are simply removed from the fluid field or reflected back to their mirror-image positions outside the structure. The present algorithm introduces an identical vortex blob outside the body using the mapping method to avoid circulation loss caused by the vortex blob penetrating the body. This can keep the body surface streamlined and guarantees that the total circulation will be constant at any time step. The model was validated using cases of viscous incompressible flow passing elliptic cylinders with various thickness-to-chord ratios at Reynolds numbers greater than Re = 1 × 105. The force and velocity fields revealed that this boundary scheme converged, and the resultant time-averaged surface pressure distributions were all in excellent agreement with wind tunnel tests. Furthermore, a flow around a symmetrical Joukowski foil at Reynolds number Re = 4.62 × 104, without considering the trailing cusp, was investigated, and a close agreement with the experimental data was obtained.

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Flow reproduction using Vortex Particle Methods for simulating wake buffeting response of bluff structures

Cited by 15 publications

References 22 publications

A Pseudo Three-Dimensional Multi-Slice Numerical Model to Simulate Wind-Induced Vibration of Thin-Walled Roof Systems

A Pseudo Three-Dimensional Multi-Slice Numerical Model to Simulate Wind-Induced Vibration of Thin-Walled Roof Systems

Aeroelastic analyses of bridges using a Pseudo-3D vortex method and velocity-based synthetic turbulence generation

Conformal Mapping-Based Discrete Vortex Method for Simulating 2-D Flows around Arbitrary Cylinders

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