DOI: 10.17603/ds2-h4pt-d221
title: Wind Profiles in a Boundary Layer Wind Tunnel based on Different Approach Terrain Configurations
title: in Modeling of Higher-Order Turbulence from Randomize Terrain in a Boundary Layer Wind Tunnel

description: Over the course of this project, the turbulence profiles from hundreds of different Terraformer roughness element configurations were collected, providing a very rich dataset of boundary layer flow as a function of upwind fetch. 
Vertically aligned turbulence measuring Cobra probes vertically separated by 160 mm are mounted on an automated articulating gantry programmed to move in three dimensions. In this manner, three vertical turbulence profiles in different lateral locations are measured during each experiment. The flow is driven by the eight vane axial fans and conditioned by the Irwin Spires through the inlet after which the boundary layer flow is developed over the Terraformer roughness element section before arriving at the measuring plane. The x direction is defined as the upstream from the vane axial fans, y direction is perpendicular to the x direction and represents the lateral locations of the measured vertical profiles. Finally, z represents the vertical height of the cobra probes from the floor of the UFBLWT.
description: Boundary Layer Wind Tunnel (BLWT) facilities are commonly used for assessing wind loads on structures. Although BLWT facilities routinely match 1st and 2nd-order wind profile models, evidence suggests that turbulence in the roughness sublayer and the inertial sublayer exhibit non-Gaussian higher-order properties. These non-Gaussian properties can influence peak wind pressures, which govern certain structural limit states and play an important role in design. In the first part of this project, Machine learning (ML) methods are employed to identify relationships between roughness element configurations and higher-order statistical properties of the wind field. A semi-automated framework with an active learning portion and a wind tunnel experimental procedure is developed. The learning framework adaptively selects roughness profiles and launches new experiments to identify differing profiles with second-order equivalent flow as quantified by turbulence intensity. The premise is that second-order equivalent wind fields can differ in higher-order properties and therefore extreme value derived peak loads may differ. Over the course of this project, the turbulence profiles from hundreds of different Terraformer roughness element configurations were collected, providing a very rich dataset of boundary layer flow as a function of upwind fetch. 

Experiment 1 (Wind Profiles in a Boundary Layer Wind Tunnel based on Different Approach Terrain Configurations) provides the metadata to describe and interpret measured wind profiles at the UFBLWT for a data set collected for the Benchmark experiments and 3 different phases: 1) Sinusoidal waves experiments, 2) Shape study experiments and, 3) Random field experiments.

Experiment 2 (Pressure coefficients on a simple geometry Bluff body generated by a randomized terrain in a Boundary Layer Wind Tunnel) of this dataset presents the results of experiments conducted in the UFBLWT, with a focus on measuring turbulence characteristics and pressure coefficients on a bluff body under varying terrain roughness configurations. The dataset provides valuable insights into the influence of upwind fetch and surface roughness on wind-induced forces, contributing to improved modeling and prediction of wind loads on structures.
Based on the Terraformer configurations in experiment 1, select configurations (Benchmark and Phase 1 Terraformer configurations only) were chosen for bluff body experiments, along with additional approach turbulence measurements at a lateral location to the model. This dataset includes three key components for Benchmark and Phase 1 Terraformer configurations: reference wind velocity (uRef), lateral approach flow profiles (LatFlow), and pressure coefficients (Cpdata) on the bluff body.