engleski

Validation of the immersed boundary surface method in computational fluid dynamics

The aim of this thesis is to describe the Immersed Boundary Method version implemented in foam-extend 4.1, both its advantages and shortcomings. The main goal of the Immersed Boundary Method is to simplify the mesh generation process in Computational Fluid Dynamics, which can lead to drastic reductions of human time needed for setting up simulations, especially for simulations with complex geometries. Additionally, it can offer certain advantages in simulations with moving meshes, as it can decrease the computational requirements of such cases. The main shortcoming of the Immersed Boundary Method is loss of solution accuracy on immersed boundaries (surfaces of simulated objects). The foam-extend 4.1 Immersed Boundary Method is here validated on three cases: internal 2-D flow over a backward facing step, external flow around the Onera M6 wing, and the flow in a model Francis turbine, which is an especially interesting case, concerning the Immersed Boundary Method. The results of the Immersed Boundary Method simulations are compared to the results of equivalent body-fitted (conventional) simulations. The simulation results are generally satisfactory, as the loss of accuracy was modest enough to assess the foam- extend 4.1 implementation of the Immersed Boundary Method as successful.

Computational Fluid Dynamics ; CFD ; OpenFOAM ; foam-extend ; Immersed Boundary Method

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