Comparison of CFD simulations to non-rotating MEXICO blades experiment in the LTT wind tunnel of TUDelft

Zhang, Ye; Zuijlen, Alexander van; Bussel, Gerard van

doi:10.1088/1742-6596/524/1/012013

Cited by 7 publications

(7 citation statements)

References 5 publications

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“…The CFD results for U ∞ = 24m/s illustrate it is an ongoing challenge to predict massive separation by RANS simulation. 3 Similar conclusions can be found in the reference, 4 where RANS simulations with k − ω SST turbulence model are compared with static MEXICO blade measurement. Results show that good Cp comparison can be achieved at the attached flow condition, but RANS fails to predict Cp correctly in massively separated flow when the blades experience high angles of attack.…”

Section: Introductionsupporting

confidence: 67%

Massively separated turbulent flow simulation around non-rotating MEXICO blade by means of RANS and DDES approaches in OpenFOAM

Zhang

Zuijlen

Bussel

2015

33rd AIAA Applied Aerodynamics Conference

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This paper presents a numerical simulation of non-rotating MEXICO blade by using both Reynolds-averaged Navier-Stokes (RANS) and delayed detached-eddy simulation (DDES) approaches in OpenFOAM. Our objective is to investigate the improvement of DDES calculations, compared to RANS calculations when the flow has massive separation. First, DDES concept in OpenFOAM is validated with two test cases, namely 2D turbulent flat plate with zero pressure gradient and NACA0021 airfoil in deep stall. Then massively separated turbulent flow around the static three dimensional twisted blade at high angle of attack is simulated. The numerical results are compared with the experimental data from the non-rotating MEXICO blade experiment, conducted at the Low Turbulence Tunnel (LTT) in Delft University of Technology (TUDelft). Results reveal that RANS simulation fails to predict massively separated turbulent flow due to its inherent overestimation of the eddy viscosity. Pressure coefficient (Cp) comparison indicates the flow separation prediction is delayed for the airfoil DU91-W2-250 at 35% span by RANS calculations. However, DDES approach in OpenFOAM can resolve massively separated turbulent flow reasonably well and shows very promising results.

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Section: Introductionsupporting

confidence: 67%

Massively separated turbulent flow simulation around non-rotating MEXICO blade by means of RANS and DDES approaches in OpenFOAM

Zhang

Zuijlen

Bussel

2015

33rd AIAA Applied Aerodynamics Conference

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“…The present study seeks to validate CFD results with experimental measurements performed by Zhang et al [16]. Methodology used in this study, uses ANSYS workbench platform to model, mesh and solve numerical problem.…”

Section: Introductionmentioning

confidence: 98%

“…Numerous CFD simulations using various solvers and turbulence models have been successfully compared with MEXICO experimental data in various studies [10,[13][14][15][16]. Carrion et al [13] summarized CFD aerodynamic analysis studies ranging from 2D simulations to 3D simulations.…”

Section: Introductionmentioning

confidence: 99%

“…Réthoré et al [18], compared MEXICO experiments with CFD simulation using OpenFoam by modelling exact geometry of wind tunnel and wind turbine rotor. A non-rotating MEXICO blade has been investigated through experiments and OpenFoam simulations [16]. Several uncertainties that occur due to rotational effects as well as complex flow over rotating blade are eliminated by adopting non-rotating blade.…”

Section: Introductionmentioning

confidence: 99%

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Three Dimensional CFD Simulations of A Wind Turbine Blade Section; Validation

Muiruri¹,

Motsamai²

2018

JESTR

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The purpose of present study is to approve use of ANSYS software as a tool for wind turbine simulations. Based on workbench platform designmodeler, mechanical mesh and fluent components, the study attempts to reproduce experimental measurements performed on standstill outboard MEXICO blade section in the low speed low turbulence (LTT), a facility at Delft University of Technology. The outboard MEXICO blade section geometry same as the one used in experiments is adopted for numerical simulations. Three set of angle of attack are taken as variable with inlet velocity hold at 35 m/s and fluid flow viscosity at 1.462kgms −2 in every simulation. Steady state pressure based solver is utilized to solve continuity and momentum Navier-Stoke equations with k − ω SST turbulent model taken as closure. Pressure and velocity are decoupled via SIMPLE algorithm and discretization scheme specified to second order upwind for momentum, turbulent kinetic energy and dissipation rate, while pressure interpolation scheme settled to second order. Computed pressure coefficient around selected airfoil sections is compared to experiment measurements which include; RISOE_121 at 60%R and NACA64418 at 92%R. Comparison shows good agreement between the CFD simulation and experiment results, but slight variation is observed at around RISOE_121 airfoil.

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“…CFD simulations are expected to cope with the quasi‐2D aerodynamics without too much effort in comparisons with the experimental measurements. Indeed, previous simulations on the non‐rotating MEXICO blade, at fully attached, massively separated and stall conditions, demonstrate that Reynolds‐averaged Navier–Stokes simulations with Menter's k − ω SST turbulence model shows good agreement with the experiment for fully attached flow at low angles of attack.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations of aerodynamic loads and 3D flow over non‐rotating MEXICO blades

et al. 2016

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This paper presents the experimental and numerical study on MEXICO wind turbine blades. Previous work by other researchers shows that large deviations exist in the loads comparison between numerical predictions and experimental data for the rotating MEXICO wind turbine. To reduce complexities and uncertainties, a non-rotating experimental campaign has been carried out on MEXICO blades Delft University of Technology. In this new measurement, quasi-2D aerodynamic characteristics of MEXICO blades on three spanwise sections are measured at different inflow velocities and angles of attack. Additionally, RANS simulations are performed with OpenFOAM-2.1.1 to compare numerical results against measured data. The comparison and analysis of aerodynamic loads on the blade, where three different airfoil families and geometrical transition regions are used, show that for attached flow condition, RANS computation predicts excellent pressure distribution on the NACA airfoil section (r=R D 0.92) and good agreement is observed on the DU (r=R D 0.35) and RISØ (r=R D 0.60) airfoil sections. Unexpected aerodynamic characteristics are observed at the intermediate transition regions connecting the RISØ and DU airfoils, where sudden lift force drop is found at the radial position r=R D 0.55. Through numerical flow visualization, large-scale vortical structures are observed on the suction side of the blade near the mid-span. Moreover, counter-rotating vortices are generated behind the blade at locations where unexpected loads occurs. Consequently, the RISØ airfoil could not give expected 2D aerodynamic characteristics because of upwash/downwash effects induced by these counter-rotating vortices, which make 3D effects play an important role in numerical modeling when calculating the aerodynamic loads for MEXICO rotor.

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Comparison of CFD simulations to non-rotating MEXICO blades experiment in the LTT wind tunnel of TUDelft

Cited by 7 publications

References 5 publications

Massively separated turbulent flow simulation around non-rotating MEXICO blade by means of RANS and DDES approaches in OpenFOAM

Massively separated turbulent flow simulation around non-rotating MEXICO blade by means of RANS and DDES approaches in OpenFOAM

Three Dimensional CFD Simulations of A Wind Turbine Blade Section; Validation

Experimental and numerical investigations of aerodynamic loads and 3D flow over non‐rotating MEXICO blades

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