| Abstrakt: |
The hydrodynamic problems could be solved by assisting the computational fluid dynamics software, paid or based on open-source software. An open-source CFD software, OpenFOAM, is currently at the forefront of solving fluid-related problems, competing with paid CFD software, such as ANSYS Fluent, FLOW-3D, Autodesk CFD, or PHONICS. This study aims to show how OpenFOAM solves one of the fundamental hydrodynamic problems: water flow around a cylindrical obstacle. OpenFOAM's ability to solve turbulence problems at a boundary is determined by observing the flow pattern behind a cylindrical obstacle based on velocity profiles and streamlines. Meanwhile, OpenFOAM's ability to generate the resistance of an obstacle to fluid flow is determined by calculating the drag coefficient based on nine variations of the Reynolds number (Re). 2D flow simulations have been built with OpenFOAM using a CFD approach. OpenFOAM solves the Navier-Stokes equation for incompressible flow by applying the Finite Volume Method. A Turbulent Large Eddy Simulation (LES) k-equation model was chosen to overcome the turbulence. The water velocity field around a fixed diameter cylinder has been calculated using OpenFOAM based on the variation of Re from Re=0.1 (laminar flow) to Re=107 (turbulent flow). The velocity profile of the water behind the cylinder has been compared with the theory and shows a good agreement between the numerical and theoretical results. The streamlines pattern has similarities to the scientific literature. Finally, the drag coefficient (CD) is calculated based on the velocity field generated from the OpenFOAM calculations. The values of CD have followed the drag coefficient diagram of the scientific literature. The comparison test shows that OpenFOAM performs well in solving the problems of water flow through a cylindrical obstacle. The open-source CFD software OpenFOAM could be used as an alternative low-cost option to support studies related to hydrodynamics, such as aerodynamic studies, bridge pier structure design, wind and water turbine studies, and offshore/onshore foundation structure design, and breakwater design. [ABSTRACT FROM AUTHOR] |
