Physical and Numerical Modeling of Water Flow Through Coanda-Effect Screens

Abstract

In this paper, two and thro-dimensional numerical modeling is applied in order to simulate water flow through the coanda-effect screen specimen. In addition, the output of the numerical models is compared with experimental data. An analysis and comparison with previously obtained experimental results were made, on the basis of which a mathematical model was created according to (Wahl et al. in Hydraulic measurements & experimental methods. Durham, 2017 [1]), which defines the lattice capacity. The terms hydraulic and physical model are often used in the literature. The term physical model has a broader meaning and encompasses other models. The hydraulic model is therefore a physical model on which water flow processes are simulated. When the real-world (prototype) flow cannot be adequately simulated, a hydraulic model is performed under laboratory conditions. It is necessary to define the relationships between the individual essential physical quantities in the fluid flow, and to confirm the results obtained theoretically . Open trough flow is a very common occurrence in hydro-technical practice, and involves flow in natural watercourses as well as flow in channels. All flow cases are characterized by a free surface with atmospheric pressure. The atmospheric pressure is taken to be conditionally equal to zero, so that on the free surface the piezometer line is equal to the geodetic elevation angle. It is accepted that the water is incompressible and homogeneous. For a stationary case, the magnitudes of flows describing that flow (velocity, water depth, pressures, forces, and energy) do not change over time. Non-uniform stationary flow, as the subject of research here, implies a change in parameters (velocity, depth, flow …) along the flow, as opposed to uniform, where this is not the case. The results of their numerical simulations satisfactory agreed with experimental data. The results ware compared with laboratory experiments. The results reached a good quantitative agreement.