engleski

Modeling the influence of partially immerged vertical screen on flow field

This paper presents the results of a research on physical and 2D numerical models with the aim of defining a corresponding numerical model roughness coefficient by means of which it would be possible to simulate the 3D effect of a partially immersed vertical screen on the flow field. The physical model was built in the horizontal bottom channel with a constant width of 1m and a total length of 15m. Five hypothetical layout configurations with a combination of full and partial screen immersions were analyzed. For each physical model layout, the cases of 25%, 33% and 50% partial immersion of vertical screens were tested. Reynolds's numbers in the channel were in the range from 4.4E+4 to 7.3E +4. The impact of each configuration and vertical screen immersion depth on the reduction of the flow below the vertical screen was defined by measuring the flow velocity and depth along vertical and horizontal measurement nodes. The 2D numerical model is based on the finite difference method in the treatment of shallow water equations. The values of Manning's roughness coefficients for numerical model, needed for producing the appropriate discharge decrease through the vertical profiles of the partially immersed screens, were referenced on the physical model measurement results. The obtained results indicate the possibility of practical application of the 2D numerical model in quantification of more complex three-dimensional flow processes.

physical and 2D numerical models; roughness coefficient; partially immersed vertical screen

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