Development of a fluid structure interaction tool based on an actuator line model

Spyropoulos, N. Antonakakis; Prospathopoulos, John; Manolas, Dimitris I.; Papadakis, George; Riziotis, Vasilis A.

doi:10.1088/1742-6596/1618/5/052072

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…MaPFlow has been validated in pure aerodynamic analyses against experimental measurements and other computational tools [28]. The same holds for hGAST when coupled with BEM and vortex type aerodynamic models [28,55]. In the present work, the coupled hGAST/MaPFlow tool is validated.…”

Section: The Structural Dynamics Modelmentioning

confidence: 79%

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Investigating the Level of Fidelity of an Actuator Line Model in Predicting Loads and Deflections of Rotating Blades under Uniform Free-Stream Flow

et al. 2021

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In this paper, the accuracy of an in-house Actuator Line (AL) model is tested on aeroelastic simulations of a Wind Turbine (WT) rotor and a helicopter Main Rotor (MR) under uniform free-stream flow. For the scope of aeroelastic analyses, the AL model is coupled with an in-house multibody dynamics code in which the blades are modeled as beams. The advantage from the introduction of CFD analysis in rotorcraft aeroelasticity is related to its capability to account in detail for the interaction of the rotor wake with the boundary layer developed on the surrounding bodies. This has proven to be of great importance in order to accurately estimate the aerodynamic forces and thus the corresponding structural loads and deflections of the blades. In wind turbine applications, a good example of the above is the rotor/ground interaction. In helicopter configurations, the interaction of MR with the ground or the fuselage and the interaction of tail rotor with the duct in fenestron configurations are typical examples. Furthermore, CFD aerodynamic analysis is an obvious modeling option in which the above mentioned asset can be combined with the consideration of the mutual interaction of the rotor with the ambient turbulence. A WT rotor operating inside the atmospheric boundary layer under turbulent free-stream flow is such a case. In the paper, AL results are compared against Blade Element Momentum (BEM) and Lifting Line (LL) model results in the case of the WT, whereas LL and measured data are considered in the helicopter cases. Blade loads and deflections are mainly compared as azimuthal variations. In the helicopter MR cases, where comparison is made against experimental data, harmonic analysis of structural loads is shown as well. Overall, AL proves to be as reliable as LL in the canonical cases addressed in this paper in terms of loads and deflections predictions. Therefore, it can be trusted in more complex flow conditions where viscous effects are pronounced.

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Section: The Structural Dynamics Modelmentioning

confidence: 79%

“…In the present work, the coupled hGAST/MaPFlow tool is validated. More details about the implementation of the under investigation AL module within MaPFlow and the aeroelastic coupling can be found in [55].…”

Section: The Structural Dynamics Modelmentioning

confidence: 99%

Investigating the Level of Fidelity of an Actuator Line Model in Predicting Loads and Deflections of Rotating Blades under Uniform Free-Stream Flow

et al. 2021

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“…Although the ASM and ALM capture the wake dynamics with greater fidelity than the actuator disk model [21,29], due to grid resolution constraints for the simulation of large wind farms, continuous improvements to the actuator disk model have been made [19,20,22]. However, using BEM to calculate loads over the blade for the ALM is of particular interest in studying the aeroelastic response of the blades [40][41][42][43][44][45][46][47]. Moreover, Draper et al [48,49] conducted a grid sensitivity analysis on the performance of the actuator line model for coarse resolutions, i.e., larger than the recommended (D/∆ grid < 50).…”

Section: Introductionmentioning

confidence: 99%

A Comparative Analysis of Actuator-Based Turbine Structure Parametrizations for High-Fidelity Modeling of Utility-Scale Wind Turbines under Neutral Atmospheric Conditions

Santoni,

Sotiropoulos,

Khosronejad

2024

Energies

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This study compared the efficacy of the actuator line and actuator surface models in carrying out large-eddy simulations of a utility-scale wind turbine. A large-eddy simulation with the actuator surface and line models was employed to study the wake flow and power production of the turbine. While both the actuator models were employed for the blade representation, the nacelle was modeled using the actuator surface approach. Both of the actuator models demonstrated agreement in the mean velocity field, power production, and turbulence kinetic energy of the wake flow. Comparing the wake flow, power production, and turbulence kinetic energy results, it was found that the mean discrepancy between the two models was 0.6%, 0.3%, and 2.3%, respectively. Despite the minor discrepancies, both actuator models accurately captured the hub vortex in the wake of the nacelle, evidenced by an energy peak in wind speed spectra at f/fω≈0.34.

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Revising of the Near Ground Helicopter Hover: The Effect of Ground Boundary Layer Development

et al. 2021

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The interaction of a helicopter rotor with the ground in hover flight is addressed numerically using a hybrid Eulerian–Lagrangian CFD model. When a helicopter takes off or lands, its wake interferes with the ground. This interaction, depending on the height-to-rotor diameter ratio, causes the altering of the rotor loading and performance as compared to the unconstrained case and gives rise to the development of a complex outwash flow field in the surrounding of the helicopter. The present study aims to characterize the interactional phenomena occurring in the early stages of the rotor wake development and in particular the interference of the starting vortex with the ground boundary layer and the effect of this interaction in the motion of the vortex in the rotor outwash flow. The hybrid CFD method employed combines a standard URANS compressible finite volume solver, the use of which is restricted to confined grids around solid bodies, and a Lagrangian approximation of the entire flow field in which conservation equations are solved in their material form, disctretized using particle representation of the flow quantities. The two methods are strongly coupled to each other through an appropriate iterative scheme. The main advantage of the proposed methodology is that it can conveniently handle complex configurations with several bodies that move independently from one another, with affordable computational cost. In this paper, thrust coefficient predictions of the hybrid model are compared to predictions of a free wake code and to experimental data indicating that consistent prediction of the rotor load requires the inclusion of the ground boundary layer in the analysis. Moreover, detailed comparisons of the rotor wake evolution predicted by the hybrid model are presented.

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Development of a fluid structure interaction tool based on an actuator line model

Cited by 3 publications

References 12 publications

Investigating the Level of Fidelity of an Actuator Line Model in Predicting Loads and Deflections of Rotating Blades under Uniform Free-Stream Flow

Investigating the Level of Fidelity of an Actuator Line Model in Predicting Loads and Deflections of Rotating Blades under Uniform Free-Stream Flow

A Comparative Analysis of Actuator-Based Turbine Structure Parametrizations for High-Fidelity Modeling of Utility-Scale Wind Turbines under Neutral Atmospheric Conditions

Revising of the Near Ground Helicopter Hover: The Effect of Ground Boundary Layer Development

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