EXP 1-2 Description: Difference between revisions

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= Description of Study Test Case =
= Description of Study Test Case =
This section should:
The following figures show schematically the general set-up of the wind tunnel experiment and the cases investigated. In general, the city model (either with even height, marked A1, or with uneven height, marked A2) was positioned in the middle of the wind tunnel experiment section (Fig. 1a). To simulate the oblique wind direction, the model was rotated 45 degrees in its centre (corresponding to the centre of the coordinates x,z,y). The studied street canyons were positioned in the middle of the urban model (green rectangles in Fig. 2a and b), as well as the line source near the ground (the red line in Fig. 2a and b). For model A1, only the right street canyon (designated A1-R, viewed from downstream) was investigated due to symmetry, while the right (A2-R) and left (A2-L) street canyons were investigated in model A2 due to the uneven roof height. Upstream of the model, a neutrally stratified atmospheric boundary layer was simulated using roughness elements and Irwin spires in the development section of the wind tunnel. Based on the mean height of the building (H) and the free flow velocity Uref = 6.2 m s-1 (which was used as the reference velocity), the flow was completely independent of the Reynolds number (i.e. ReB = HUref/ν ≈ 24,400, where ν is the kinematic viscosity of the air).
* Convey the general set-up of the test case configuration (e.g. airflow over a bump on the floor of a wind tunnel)
* Describe the geometry, illustrated by a sketch
* Specify the flow parameters which define the flow regime (e.g. Reynolds number, Rayleigh number, angle of incidence etc.)
* give the principal quantities of interest that were measured - these should include global parameters but also mean-flow and turbulence parameters.




The description can be kept fairly short if reference can be made to a publication or a link to a data base where details are given. For other cases a more detailed, self-contained description should be provided.
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Revision as of 11:40, 9 May 2023

Lib:Create_Ercoftac_Article_Form

Front Page

Introduction

Review of experimental studies

Description

Experimental Set Up

Measurement Quantities and Techniques

Data Quality and Accuracy

Measurement Data and Results

Description of Study Test Case

The following figures show schematically the general set-up of the wind tunnel experiment and the cases investigated. In general, the city model (either with even height, marked A1, or with uneven height, marked A2) was positioned in the middle of the wind tunnel experiment section (Fig. 1a). To simulate the oblique wind direction, the model was rotated 45 degrees in its centre (corresponding to the centre of the coordinates x,z,y). The studied street canyons were positioned in the middle of the urban model (green rectangles in Fig. 2a and b), as well as the line source near the ground (the red line in Fig. 2a and b). For model A1, only the right street canyon (designated A1-R, viewed from downstream) was investigated due to symmetry, while the right (A2-R) and left (A2-L) street canyons were investigated in model A2 due to the uneven roof height. Upstream of the model, a neutrally stratified atmospheric boundary layer was simulated using roughness elements and Irwin spires in the development section of the wind tunnel. Based on the mean height of the building (H) and the free flow velocity Uref = 6.2 m s-1 (which was used as the reference velocity), the flow was completely independent of the Reynolds number (i.e. ReB = HUref/ν ≈ 24,400, where ν is the kinematic viscosity of the air).





Contributed by: Štěpán Nosek — Institute of Thermomechanics of the CAS, v. v. i.

Front Page

Introduction

Review of experimental studies

Description

Experimental Set Up

Measurement Quantities and Techniques

Data Quality and Accuracy

Measurement Data and Results


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