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Furry Hill Neutral

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Scope

The benchmark is open to participants of the Wakebench project using canopy models. The benchmark will evaluate the ability of the models at reproducing the interaction of canopy and hill flows in idealized conditions.

Objectives

Demonstrate the performance of the models at reproducing mean flow and turbulent quantities on a hill-induced heterogeneous canopy. Test model fine-tuning strategies in a controlled environment when boundary conditions are well defined.

Data Accessibility

The benchmark is offered to participants of the IEA Task 31 Wakebench who agree with the terms and conditions described below.

Input data

The conditions for simulating the Furry Hill experiment in neutral conditions are:

  • Inlet profile: measurements at X = -2.125 m (X/L = -5.06)
  • Hill profile: Zh(X)=h/(1+(X/L)2), with X = 0 at the crest of the ridge, truncated at X = ±925 mm where it smoothly meets the flat floor. Ridge height h = 150 mm, half-length L = 420 mm.
  • Canopy height: hc = 0.047 m
  • Canopy drag coefficient: Cd = 0.68
  • Canopy-area-density: A = 0.1 m-1
  • Obukhov length: L0 = ∞
  • Use dry air with a density ρ = 1.225 kg/m3 and dynamic viscosity μ = 1.73e-5 kg/ms

Validation data

The validation data consists on vertical profiles of velocity components (U,W), Reynolds stress (uw) and turbulent kinetic energy (tke) at X/L=[-5.06, -4.05, -3.04, -2.02, -1.37, -1.01, -0.67, 0, 0.67, 1.01, 1.35, 2.02, 2.53, 3.04, 3.54].

Model runs

The domain should extend from X/L = -5.06 (-2.125 m) to, at least, X/L= 6 (2.52 m), sufficient to capture the wake of the hill. The top boundary should be placed at the wind tunnel ceiling situated at 0.65 m (4.3h).

Output data

Please provide vertical profiles, from bottom to top boundary, of velocity components (U,W), static pressure (P), Reynolds stress (uw) and turbulent kinetic energy (tke) at the validation positions. Use the file naming and format convention described in the Windbench user's guide with profID = prof#, where # goes from 1 (X/L = -5.06) to 15 (X/L = 3.54). Hence, each file contains the following variables (header), in this order: X(m), Z(m), U(m/s), W(m/s), P(Pa), uw(m2/s2), tke(m2/s2). Please mention the distance X/L that limits the recirculation bubble behind the hill (the point at which the U component changes sign).

Remarks

For a better assessment of model performance it is expected that the user simulates the WavingWheat test case first. In fact, this simulation can be used as precursor in order to fit the inlet data for the Furry Hill computational domain.

In order to evaluate the added value of model fine-tuning it is important that you describe how this is performed. Please report on the deviations with respect to default settings if validation data were not available a priori (blind conditions).

Terms andConditions

Interested participants will have to subscribe to the attached data licensing agreement agreed between CENER and CSIRO. Please send two signed copies to: Javier Sanz Rodrigo, Calle Ciudad de la Innovación 7, 31621-Sarriguren, Spain

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