Gutierrez, E.; Favre, F.; Balcazar, N.; Rigola, J. International Conference on Computational and Experimental Methods in Multiphase and Complex Flow p. 208-219 DOI: 10.2495/CMEM-V6-N1-208-219 Data de presentació: 2017-06-22 Presentació treball a congrés
A coupled Conservative Level Set – Moving Mesh – Immersed Boundary method is formulated and validated against the three-dimensional gravity-driven falling drop problem. First, by employing Conservative Level-Set (CLS) method, the multiphase domain can be successfully handled, while the mass conservation is controlled. Then, by using an Arbitrary Lagrangian-Eulerian formulation (i.e. a moving mesh), the simulation domain can be optimized by reducing the domain size and by allowing an improved mesh, resulting in a computational resources saving. Finally, the use of an Immersed Boundary (IB) method allows to deal with intricate geometries. All these functionalities result in a versatile and robustness method to simulate bubbles/drops problems in complex geometries. The mentioned method was successfully used to thoroughly study the falling of a drop against a plane surface, providing detailed results including velocity evolution, mesh independence study, evolution of the vertical position of the drop, streamlines and vorticity fields, and profiles evolution.
The challenging problem of the full three-dimensional Taylor bubble has been addressed by using a Conservative Level Set method in order to deal with the multiphase flow. A moving mesh is used, aiming to optimize the simulation domain. The mesh is moved as the bubble rises, so the region of study can be limited to the surroundings of the bubble, notably reducing the domain's size. This saving in the computational resources facilitates to face the Taylor bubble problem without the axisymmetric assumption. By doing so, a detailed description of the fluid field is provided, comparing the results against numerical and experimental data.
Published under licence in Journal of Physics: Conference Series by IOP Publishing Ltd.
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