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COMPUTATIONAL ANALYSIS OF PIPE FLOW IN A NUMERICAL WAVE TANK

A computational model is developed to study the flow inside a pipe immersed in a two-dimensional numerical wave tank. Salome is used to create a geometry in a block structured mesh format and exported to OpenFOAM software. Boundary conditions are imposed as piston movement for wave creation and no slip condition for wall surfaces. The study of pipe flow induced by a wave is the main objective here. The present CFD study is validated with the Wang et al (2018) and followed with Rezanejad et al (2018). The free surface is maintained at 0.42 m from the bottom in the study proposed by Rezanejad et al (2018). The corresponding free surface elevation is plotted for a particle downstream at 4.8 m. Mesh independence study is carried out prior to this study. Mesh size of 0.001 m is used at the interface and coarse mesh is chosen elsewhere to reduce the time taken for computations. InterFOAM solver is used to solve the equations with a time step interval of 0.01s. The study is further continued with the analysis of pressure and velocity inside the central point of pipe. The pressure and velocity variation inside the pipe (point located in the middle of pipe) occurs due to the oscillating wave nature at the interface. Laminar flow is assumed and cnoidal wave type is chosen here. From the results, the velocity inside the pipe increases in relation to the pressure developed inside the pipe. This verifies that the flow through the pipe is developed due to the wave boundary condition.