NIST Building#

1. Project Description#

The objective of this project is to reproduce the wind pressure properties over the NIST Building, as measured in wind tunnel by [1]. The building is at resolution level “lvl5” of the digital wind tunnel. One convective time scale is defined as \(CTS = H / U_H\).

Source of target results:

List of analysed cases

Wind direction

30°

60°

90°

NIST Building geometry

Ilustration of the geometry.#

NIST Building coordinates

Ilustration of the probes location and wind directions.#

2. Simulation Setup#

NIST Building grid

Ilustration of the computational domain.#

Simulation parameters (same for all cases)

\(\Delta x / H\) (spatial resolution)

2.08E-2

\(\Delta t / CTS\) (temporal resolution)

6.57E-4

\(\text{exports} / CTS\) (pressure acquisition frequency)

6.25E-2

\(T / CTS\) (statistical sample size)

1.05E+3

\(Re_H = U_H H / \nu\)

9.41E+4

Computational performance (NVIDIA RTX A5500)

Case

30°

60°

90°

Node count (million)

92

93

93

92

Allocated memory (Gb)

14

15

15

14

Elapsed time (h)

30

32

32

30

3. Inflow#

NIST Building
NIST Building

4. Results: Local Statistics#

Note

General comments:

  • Experimental samples of the same size (\(T / CTS\)) of the numerical samples have been selected for comparison.

  • The peak pressure coefficients have been evaluated over moving averages of the original signals, with window size described in the plot legends.

  • The acquisition frequency of the numerical calculations is significantly higher than that of the experiments, hence the numerical spectra show a higher cut-off.

Mean and Peak Pressures#

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NIST Building
NIST Building
NIST Building
NIST Building

RMS Pressures#

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NIST Building
NIST Building
NIST Building
NIST Building

Skewness and Kurtosis#

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NIST Building
NIST Building
NIST Building
NIST Building

Pressure Spectrum#

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NIST Building
NIST Building
NIST Building
NIST Building

Changelog#

Execution Notes

29 April 2024

  • Uploaded point comparisons, simulations executed with Nassu release v1.5.4.