Description

This research investigates fundamental flow around rectangular bluff bodies in atmospheric boundary layer (ABL), downburst (DB), and DB and ABL combined flows. The study focuses on three types of bluff bodies: a horizontally-extruded rectangular cylinder (like the internation benchmark model, BARC), a high-rise rectangular prism (like the CAARC standard tall building), and a low-rise rectangular prism (with similar cross-section dimensions to the CAARC standard). These body types can be regarded as fundamental models for studying structures such as long span bridges and buildings of varying heights. The project involves pressure measurements and Particle Image Velocimetry (PIV) of the flow around and in the near wake of these bluff bodies. The expected outcome is an improved capability in the prediction of the wind loads associated with downburst-like flows.

S1. Cobra Probe Rack

ABL, downburst-like, and the combination of downburst-like and ABL wind simulations were measured in a near-empty chamber. A rake of cobra probes. The height of the tallest model equals 90 cm. Thus, wind profiles will be measured using eight cobra probes mounted on a vertical stand at heights of 5 cm, 10cm, 15cm, 22.5cm, 30cm, 45cm, 70 cm, and 90 cm above the test chamber floor.

E1. Downburst-like Wind

An impinging-jet style downburst is generated at the WindEEE dome through the release of pressure from a plenum above the testing chamber. 3-D point measurements were taken to characterize the velocity profiles for downbursts. For the downburst simulations, two parameters were varied: the strength of the impinging jet flow and the position of the bell mouth (r_jet) in the WindEEE dome.

The vertical rack was positioned at a radial distance from the center of the turntable, r_jm = 320 cm, and with model angular position, φ = 180 degrees. The bell mouth position r_jet = -192, -128, -64, 0, and 64 cm from the centre of the turntable. These positions achieved r/D ratios of 1.6, 1.4, 1.2, 1, and 0.8. These measurements aim to provide detailed characteristics of the wind profile as it develops radially.

E2. Atmospheric Boundary Layer (ABL) Flow

The 60-fan wall located on one side of the hexagonal shaped WindEEE test chamber was used to generate the various ABL flows for this experiment. During the experiment, 3-D point measurements were taken to characterize the velocity profiles for numerous uniform smooth flow wind speeds.

The vertical rack was positioned at a radial distance from the center of the turntable, r_jm = 320 cm, and with model angular position, φ = 180 degrees.

E3. Downburst-like and ABL Flow Combined

In combination with the described downburst simulation in ‘S1. E2.’, these impinging-jets can be run simultaneously with the 60-fan wall (described in ‘S1. E1’) to achieve ABL and downburst-like flow combinations. During this experiment, 3-D point measurements were taken to characterize the velocity profile for a downburst with ABL wind.

The vertical rack was positioned at a radial distance from the center of the turntable (r_m) at 320 cm and with φ=180. The bell mouth position r_jet = 0 cm from the centre of the turntable.

S3. 1-400 High-Rise Building (CAARC)

A High-rise rectangular prism, 2L x 3L x 12L where the model height 12L = 450 mm representing the CAARC building at a length scale of 1:400. 32 pressure taps are distributed along 9 pressure rings arranged along the vertical direction. Additionally, 25 pressure taps are placed on the top face of the prism. This body type can be regarded as a fundamental model for studying tall buildings.

E1. Downburst-like Wind

This experiment involves testing the 1-400 Scale CAARC standard pressure model under various simulated downburst flow profiles and strengths. The model was positioned 320 cm downwind from the center of the turntable facing the 60-fan wall (r_jm = 3.2 m, φ = 180°). In addition, the radial position of the impinging jet (r_jet) was varied relative to the model to achieve r_jm/D = 0.8, 1.0, 1.2, 1.4, and 1.6, only the downburst strength was varied for these positions. The model was tested with relative angles of 0, 30, 45, 60, and 90 degrees depending on the r_jm/D position.

E2. Atmospheric Boundary Layer (ABL) Flow

This test involved the 1-400 Scale CAARC standard pressure model subjected to ABL flow at a wind speed of approximately 10 m/s. The model was positioned 320 cm downwind from the center of the turntable facing the 60-fan wall (r_jm = 3.2 m, φ = 180°). In addition, the model was tested with relative angles of 0, 10, 20, 30, 40, 45, 50, 60, 70, 80, and 90 degrees.

E3. Downburst-like and ABL Flow Combined

This experiment involves testing the 1-400 Scale CAARC standard pressure model subjected to various downburst simulations involving combinations of impinging jet outflows and an ABL head wind of approximately 4-5m/s, generated from the 60-fan wall.  The model was positioned 320 cm (r_jm/D = 1.0) radially from the center of the turntable at angles of φ = 180°. In addition, the model was tested with relative angles of 0, 45, and 90 degrees.

S5. 1-200 High-Rise Building (CAARC)

This specimen is like specimen S3 but with a model height of 12L = 900mm representing the CAARC building at the scale of 1:200.

E1. Downburst-like Wind

This experiment involves testing the 1-200 Scale CAARC standard pressure model under various simulated downburst flow profiles and strengths. The model was positioned 320 cm downwind from the center of the turntable facing the 60-fan wall (r_jm = 3.2 m, φ = 180°). In addition, the radial position of the impinging jet (r_jet) was varied relative to the model to achieve r_jm/D = 1.0, and 1.2, only the downburst strength was varied for these positions. The model was tested with relative angles of 0, 45, and 90 degrees depending on the r_jm/D position.

E2. Atmospheric Boundary Layer (ABL) Flow

This test involved the 1-200 Scale CAARC standard pressure model subjected to ABL flow at a wind speed of approximately 10 m/s. The model was positioned 320 cm downwind from the center of the turntable facing the 60-fan wall (r_jm = 3.2 m, φ = 180°). In addition, the model was tested with relative angles of 0, 45, and 90 degrees.

E3. Downburst-like and ABL Flow Combined

This experiment involves testing the 1-200 Scale CAARC standard pressure model subjected to various downburst simulations involving combinations of impinging jet outflows and an ABL head wind of approximately 4-5m/s, generated from the 60-fan wall.  The model was positioned 320 cm (r_jm/D = 1.0) radially from the center of the turntable at angles of φ = 180°. In addition, the model was tested with relative angles of 0, 45, and 90 degrees.

Series Information

This dataset is Volume 1 of 3, which together form the complete dataset for ERIES-TFCA.

Volume one includes datasets S0, S1, S3, and S5.

Volume two includes datasets S0, S4, S6, S7, S9, and S10.

Volume three includes datasets S0, S1, S2, S7, and S8.