Quick Answer
The vawt urban noise-compliant turbulence intensity threshold calculator computes turbulence intensity threshold from the input values you provide.
Calculator
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Find Engineering Solutions →Result Interpretation
VAWT Urban Noise-Compliant Turbulence Intensity Threshold calculator computes Turbulence intensity threshold in dimensionless using the defined engineering formula and the input values provided. Turbulence intensity threshold is expressed in dimensionless. No universal acceptance threshold is defined by this calculator.
Worked Example
Verified calculation
Given:
- Reference wind speed at 10 m height = 6
- Urban hub-height wind speed = 4.5
- Characteristic obstacle height = 8
- Rotor hub height = 12
- Day-night sound level difference = 8
Expected Result:
- Turbulence intensity threshold = 0.071895713793957
Engineering Interpretation:
Under the given input conditions, the calculated result is: Turbulence intensity threshold = 0.071895713793957 dimensionless.
The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from deterministically validated test cases.
Formula / Method
turbulence intensity threshold = 0.12 * pow(reference wind speed at 10 m height / urban hub-height wind speed, 0.33) * (1.0 + 0.05 * characteristic obstacle height / rotor hub height) * exp(-0.08 * day-night sound level difference)Turbulence intensity threshold.
Variables
| Symbol | Label | Role | Description |
|---|---|---|---|
| v_ref | Reference wind speed at 10 m height | INPUT | Reference wind speed at 10 m height |
| v_urban | Urban hub-height wind speed | INPUT | Urban hub-height wind speed |
| L_obstacle | Characteristic obstacle height | INPUT | Characteristic obstacle height |
| h_rotor | Rotor hub height | INPUT | Rotor hub height |
| delta_L_dn | Day-night sound level difference | INPUT | Day-night sound level difference |
| turbulence_intensity_threshold | Turbulence intensity threshold | OUTPUT | Turbulence intensity threshold |
Calculation Steps
- Enter the reference wind speed at 10 m height in m/s.
- Enter the urban hub-height wind speed in m/s.
- Enter the characteristic obstacle height in m.
- Enter the rotor hub height in m.
- Enter the day-night sound level difference in dB.
- Step 1: Compute turbulence intensity threshold.
- Read the turbulence intensity threshold (dimensionless) from the results.
Frequently Asked Questions
What does this calculator calculate?
The VAWT Urban Noise-Compliant Turbulence Intensity Threshold calculator estimates Turbulence intensity threshold based on the input parameters you provide
Why is reference wind speed at 10 m height important in this calculation?
reference wind speed at 10 m height is used directly in the calculation of turbulence intensity threshold. Its effect on the result depends on the complete formula and the values of the other inputs.. When you enter reference wind speed at 10 m height in m/s, the calculator uses it in the engineering formula to compute the output
How should I interpret the result turbulence intensity threshold?
The calculator outputs turbulence intensity threshold in dimensionless. The result is computed directly from the input values using the defined engineering formula
What units should I use for the inputs?
Enter each value in the units shown next to the input field: Reference wind speed at 10 m height (m/s), Urban hub-height wind speed (m/s), Characteristic obstacle height (m), Rotor hub height (m), Day-night sound level difference (dB). Make sure all inputs use the specified units for consistent results
What assumptions does this calculator use?
This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment
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