Abstract
The article deals with problems of using of measurement method Particle Image Velocimetry (PIV) to measure velocity fields in the flowing water in front, above and behind drowned titling weir gate. The aim was to obtain information about the distribution of speed in the area of interest for the verification or calibration of the numerical model. Experiments were carried out in inclinable channel connected to the hydraulic circuit with a pump and storage tank at the Water Management Research Laboratory (LVV) of Institute of Water Structures at the Faculty of Civil Engineering in Brno University of Technology. Hydraulic inclinable channel has cross-section with dimensions of 0.4x0.4m and length of 12.5m. The measured area has cross-section approximately 0.2m wide and 0.4m high and its length is 1m. The results of physical modelling allowed a comparison of experimental data with numerical simulation results of this type of flow in the commercial software ANSYS CFX-12.0. In the foreground interest in the field of water management still more are getting and applying options of numeric modeling, mainly based on very rapid development of the performance of personal computers. Using the numerical simulations of fluid flow, we are today able to obtain detailed information about all characteristics of the flow required for optimal design of waterwork. However, a significant disadvantage of numerical simulation is the necessity to obtain initial and marginal (boundary) conditions that must be entered as input data into the computer calculation program. These input data is in most cases can be obtained only on the basis of physical modeling, so measurements characteristics of flow on the physical model. The results of numerical simulations must be compared with the results of physical modelling and on the base it calibrated the numerical model. To determine the characteristics of liquid flow respectively velocity field on the physical model appears to be an ideal method of PIV (Particle Image Velocimetry), which allows us a sufficiently accurate measurement velocity field of fluid flow in the selected area.
Highlights
1.1 INTRODUCTION TO PROBLEMIn the foreground interest in the field of water management still more are getting and applying options of numeric modeling, mainly based on very rapid development of the performance of personal computers
The velocity field was measured only in one longitudinal section of channel, which was placed in a vertical longitudinal plane of symmetry of the channel before the titling gate, i.e. to half of the length of titling gate
The light plane was parallel to the longitudinal axis of the meter channel
Summary
In the foreground interest in the field of water management still more are getting and applying options of numeric modeling, mainly based on very rapid development of the performance of personal computers. A significant disadvantage of numerical simulation is the necessity to obtain initial and marginal (boundary) conditions that must be entered as input data into the computer calculation program. These input data is in most cases can be obtained only on the basis of physical modeling, so measurements characteristics of flow on the physical model. To determine the characteristics of liquid flow respectively velocity field on the physical model appears to be an ideal method of PIV (Particle Image Velocimetry), which allows us a sufficiently accurate measurement velocity field of fluid flow in the selected area. The replacement vector is calculated using the cross-correlation analysis [2]
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