عنوان مقاله [English]
نویسنده [English]چکیده [English]
Obstacles such as piers of bridge in flow cause confusion and disturb its natural form. With passing the flow through these obstacles disturbances will be created, called the Von Karman Street vortex shedding in downstream. When the frequency of the microwaves is equal to the natural frequency of the current approach, the resonance is formed. Which if the flows walls are constant such as a flume, this phenomenon can be seen as a transversal wave. The aim of this study is to find a correlation between the percentage of submerged obstacles and wave characteristics. In this study, 58 tests were conducted in four different arrangements barriers. In all experiments, a fixed flow rate was about 20 liters per second, 121 cylindrical barriers with 25mm diameter were used in longitudinal and lateral distances of 120 and 60mm. the experiments conditions were such that at first, in the phase which the transversal wave was formed in its highest peak, the characteristics of the wave and the current were recorded as a reference experiment and in the next phases, the characteristics of the generated transversal wave were evaluated by submerging the cylinders with a percentage of the current depth of the reference experiment. Finally, these results were obtained between submerged amplitude and non-submerged amplitude of the resonance position and height of the cylinder obstacles and average depth of flow is a logical connection. Finally, using dimensional analysis and statistical software, interfaces to estimate the relative amplitude wave was proposed, as well as data obtained from this model were compared with experimental data.