Computational analysis of flow-driven string dynamics in turbomachinery

Takizawa, Kenji; Tezduyar, Tayfun E.; Hattori, Hitoshi

doi:10.1016/j.compfluid.2016.02.019

Cited by 60 publications

(51 citation statements)

References 88 publications

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“…The sliding-interface technique was originally developed in [23] in the context of Isogeometric Analysis (IGA) [39,45], and successfully applied to simulate offshore wind turbines in [24,43,51,52], hydraulic arresting gears in [90], and kayak propulsion in [91]. The sliding-interface formulation was recently extended to the space-time (ST) VMS method [70,72,[75][76][77][78]80], and the extension is called the "ST Slip Interface (ST-SI)" method [79,82,84,85].…”

Section: Discretization Methodsmentioning

confidence: 99%

Free-surface flow modeling and simulation of horizontal-axis tidal-stream turbines

Yan¹,

Deng²,

Korobenko³

et al. 2017

Computers & Fluids

127

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A computational free-surface flow framework that enables 3D, time-dependent simulation of horizontal-axis tidal-stream turbines (HATTs) is presented and deployed using a complexgeometry HATT. Free-surface flow simulations using the proposed framework, without any empiricism, are able to accurately capture the effect of the free surface on the hydrodynamic performance of the turbine, as demonstrated through excellent agreement with the experimental data. To carry out the free-surface computations, we have developed a novel level-set redistancing procedure compatible with the sliding-interface technique used for handling the rotor-stator interaction in the HATT full-machine simulations. To illustrate the versatility of the proposed approach, additional computations are carried out where the HATT is subjected to wave action.

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Section: Discretization Methodsmentioning

confidence: 99%

Free-surface flow modeling and simulation of horizontal-axis tidal-stream turbines

Yan¹,

Deng²,

Korobenko³

et al. 2017

Computers & Fluids

127

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“…119 for the coupled incompressible-flow and thermal-transport equations retains the high-resolution representation of the thermo-fluid boundary layers near spinning solid surfaces. These ST-SI methods have been applied to aerodynamic analysis of vertical-axis wind turbines, 98,48,49 thermo-fluid analysis of disk brakes, 119 flow-driven string dynamics in turbomachinery, [120][121][122] flow analysis of turbocharger turbines, [123][124][125][126] flow around tires with road contact and deformation, 115,[127][128][129][130] fluid films, 131,130 aerodynamic analysis of ram-air parachutes, 132 and flow analysis of heart valves. 116,117,111,113 In the ST-SI version presented in Ref.…”

Section: St Slip Interface Methodsmentioning

confidence: 99%

A node-numbering-invariant directional length scale for simplex elements

Takizawa

Ueda

Tezduyar

2019

Math. Models Methods Appl. Sci.

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Variational multiscale methods, and their precursors, stabilized methods, have been very popular in flow computations in the past several decades. Stabilization parameters embedded in most of these methods play a significant role. The parameters almost always involve element length scales, most of the time in specific directions, such as the direction of the flow or solution gradient. We require the length scales, including the directional length scales, to have node-numbering invariance for all element types, including simplex elements. We propose a length scale expression meeting that requirement. We analytically evaluate the expression in the context of simplex elements and compared to one of the most widely used length scale expressions and show the levels of noninvariance avoided.

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“…In [7], the same assumption is used to study the particle-shock interaction. In [8][9][10], the assumption is used in flow-driven string dynamics in turbomachinery, where the strings are assumed to have no influence on the flow.…”

Section: Introductionmentioning

confidence: 99%

Computational analysis of particle-laden-airflow erosion and experimental verification

et al. 2020

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Computational analysis of particle-laden-airflow erosion can help engineers have a better understanding of the erosion process, maintenance and protection of turbomachinery components. We present an integrated method for this class of computational analysis. The main components of the method are the residual-based Variational Multiscale (VMS) method, a finite element particle-cloud tracking (PCT) method with ellipsoidal clouds, an erosion model based on two time scales, and the Solid-Extension Mesh Moving Technique (SEMMT). The turbulent-flow nature of the analysis is addressed with the VMS, the particle-cloud trajectories are calculated based on the time-averaged computed flow field and closure models defined for the turbulent dispersion of particles, and one-way dependence is assumed between the flow and particle dynamics. Because the target-geometry update due to the erosion has a very long time scale compared to the fluid-particle dynamics, the update takes place in a sequence of "evolution steps" representing the impact of the erosion. A scale-up factor, calculated based on the update threshold criterion, relates the erosions and particle counts in the evolution steps to those in the PCT computation. As the target geometry evolves, the mesh is updated with the SEMMT. We present a computation designed to match the sand-erosion experiment we conducted with an aluminum-alloy target. We show that, despite the problem complexities and model assumptions involved, we have a reasonably good agreement between the computed and experimental data.Tayfun E. Tezduyar tezduyar@tafsm.org cost. Reliable computational analysis can help the designers find new blade protection strategies. It can also help them to plan effective maintenance schedules. Earlier, closely-related studies [1,2] focused on the prediction of rain erosion patterns for a full-span wind-turbine blade. In [3,4], the focus was on the effect of the erosion on the aerodynamic performance of the blade, highlighting the correlation between the erosion patterns and geometry evolution.

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Computational analysis of flow-driven string dynamics in turbomachinery

Cited by 60 publications

References 88 publications

Free-surface flow modeling and simulation of horizontal-axis tidal-stream turbines

Free-surface flow modeling and simulation of horizontal-axis tidal-stream turbines

A node-numbering-invariant directional length scale for simplex elements

Computational analysis of particle-laden-airflow erosion and experimental verification

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