Post-Processing the ABL Case

Once the simulation completes, validate the results by comparing the simulated profiles against the target analytical profiles at the measurement section.

Extracting Profiles

Todo

Add AeroSim-specific instructions for extracting velocity, turbulence intensity, and TKE profiles from the simulation results. Describe the measurement section location and the extraction workflow within the AeroSim interface.

Velocity Profile and Turbulence Intensity

Plot \(U(z)\) and \(I_u(z) = \sigma_u / U(z)\) at the measurement section and overlay the target curves from the applicable wind standard (e.g., EN 1991-1-4, ASCE 7, AS/NZS 1170.2). The match should be within ±5% for \(U(z)\) and ±10% for \(I_u(z)\) across the height range of engineering interest (\(z_{ref}\) to \(2 \times z_{ref}\)).

The full workflow - loading the probe CSV, computing mean and RMS at each height, and overlaying EN 1991-1-4 reference curves - is in the downloadable notebook ABL Velocity and Turbulence Intensity from a Velocity Profile.

Integral Length Scale

The streamwise integral length scale \(L_u(z)\) is computed from the autocorrelation of the fluctuating component of the same probe time series, following Taylor’s frozen-turbulence hypothesis. It is also used to non-dimensionalise time so that statistics windowing and spectral comparisons are independent of the chosen reference velocity.

See the downloadable notebook Time Normalization Using the Integral Length Scale for the autocorrelation-based calculation and the EN 1991-1-4 reference profile.

Next Steps

Once the ABL case is validated, the inlet and roughness configuration can be directly reused in the full engineering simulation. See:

For quantitative comparisons of simulated profiles against experimental and standard target profiles - including velocity, turbulence intensity, integral length scale, and energy spectra - see the ABL validation results on docs.aerosim.io.