Numerical simulation of the wind action on a long-span bridge deck

Braun, Alexandre Luis; Awruch, Armando Miguel

doi:10.1590/s1678-58782003000400007

Cited by 14 publications

(10 citation statements)

References 10 publications

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“…The computational fluid dynamics (CFD) approaches have therefore been developed to obtain the indicial function, such as in the work of Farsani et al (2014), Hatanaka and Tanaka (2008) and Braun and Awruch (2003). R. Scanlan …”

Section: Extension Of Unsteady Aerodynamics Theorymentioning

confidence: 99%

Development of a time delay formulation for fluidelastic instability model

Mureithi

2017

Journal of Fluids and Structures

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Tube arrays in industrial components such as heat exchangers and steam generators are susceptible to damage due to fluidelastic instability (FEI). This study focuses on the modelling of fluidelastic instability in tube arrays subjected to cross-flow. There is agreement on the idea of introducing a time delay in FEI models. Although it is one of the key parameters for FEI models, the phenomenon behind this time delay is still subject to many possible explanations, and the underlying physics is still not well understood.In the present work a new time delay formulation for the class of the quasi-steady FEI models is derived in the frequency domain in the form of an Equivalent Theodorsen Function.Unsteady and quasi-static fluid forces were measured to develop the time delay formulation.The effect of Reynolds number on the static force coefficients was also investigated. The time delay function was found to be also dependent on the Reynolds number which implies that the fluidelastic instability is also Reynolds number dependent. Comparison to other time delay functions proposed in the quasi-steady and quasi-unsteady models is made. An initial overshoot in the lift force was observed for the present model.

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Section: Extension Of Unsteady Aerodynamics Theorymentioning

confidence: 99%

Development of a time delay formulation for fluidelastic instability model

Mureithi

2017

Journal of Fluids and Structures

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“…The explicit two-step Taylor-Galerkin scheme is employed in this work for the time discretization of the flow governing equations (see Kawahara and Hirano [55]; Braun and Awruch [43]). The algorithm for the flow simulation may be found in Table 1 and the final form of the numerical model is obtained applying the Bubnov-Galerkin's weighted residual scheme into the FEM context on the discrete forms of the flow governing equations.…”

Section: The Numerical Model To Simulate Wind Flowsmentioning

confidence: 99%

“…A major topic in this paper is referred to one of the first attempts to simulate the aeroelastic behavior of a tall building employing complex CFD techniques, whereas the numerical database for building aeroelasticity in CWE is very deficient. In the numerical model adopted in this work an explicit two-step Taylor-Galerkin scheme is utilized to solve the flow governing equations, which are kinematically described using an ALE (arbitrary Lagrangean-Eulerian) formulation (see Braun and Awruch [43][44][45]). LES with the dynamic sub-grid scale model are used in the turbulence modeling.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic and aeroelastic analyses on the CAARC standard tall building model using numerical simulation

Braun

Awruch

2009

Computers & Structures

107

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“…Additional information about this numerical model may be found in Kawahara and Hirano [2] and Braun and Awruch [29]. The algorithm for the flow simulation may be summarized in the following steps:…”

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confidence: 99%

A partitioned model for fluid–structure interaction problems using hexahedral finite elements with one‐point quadrature

Braun

Awruch

2009

Numerical Meth Engineering

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A partitioned numerical model for fluid-structure interaction analysis of incompressible flows and structures with geometrically non-linear behavior is presented in this work. The flow analysis is performed considering the well-known Navier-Stokes equations for Newtonian fluids and the continuity equation, obtained from the pseudo-compressibility hypothesis. An explicit two-step Taylor-Galerkin scheme is employed in the time discretization procedure of the system of governing equations, which is expressed in terms of an arbitrary Lagrangean-Eulerian description. The structural subsystem is analyzed using a geometrically non-linear elastic model and the respective equation of motion is discretized in the time domain employing the Generalized-scheme. Fluid-structure coupling is taken into account regarding a new energy-conserving partitioned scheme with non-linear effects, which is accomplished by enforcing equilibrium and kinematical compatibility conditions at the solid-fluid interface. Non-matching meshes and subcycling are also considered in the present model. The finite element method is employed for spatial discretizations using eight-node hexahedral elements with one-point integration in both fields. Some numerical examples are simulated in order to demonstrate the applicability of the proposed formulation.A. L. BRAUN AND A. M. AWRUCH associated physical problem adequately. Consequently, an increasing demand for accurate numerical models to simulate fluid-structure interaction (FSI) phenomena has been observed in recent years. These models may present different levels of accuracy, depending on the different approaches assumed for the fluid field (Navier-Stokes equations for viscous incompressible flows or Euler equations for inviscid compressible flows), for the structural field (rigid-body motion analysis, geometrically linear/non-linear elastodynamic analysis) and for the coupling scheme (monolithic or partitioned methods). Moreover, owing to the huge computational efforts inherent to FSI analyses, numerical facilities are also very helpful to obtain efficient algorithms, which include nonmatching meshes for fluid and structure at the interface, an unique finite element formulation (for instance, eight-node hexahedral elements with one-point integration) for spatial approximation in both subsystems and subcycling techniques to enable independent time approximation for each physical field.Many realistic flows (for instance, wind action over bluff bodies) may be well represented using the viscous incompressible flow theory, which is fully described by the Navier-Stokes equations. However, incompressible flow analyses are very hard to perform by numerical simulation owing to restrictions imposed by the continuity equation, which is reduced to the divergencefree condition on the velocity field. The incompressibility constraint usually leads to implicit treatment of the pressure field, which requires additional storage capacity of the computational memory. Moreover, implicit algorithms are not suitable to analy...

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Numerical simulation of the wind action on a long-span bridge deck

Cited by 14 publications

References 10 publications

Development of a time delay formulation for fluidelastic instability model

Development of a time delay formulation for fluidelastic instability model

Aerodynamic and aeroelastic analyses on the CAARC standard tall building model using numerical simulation

A partitioned model for fluid–structure interaction problems using hexahedral finite elements with one‐point quadrature

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