Teitl: Modelling flows of complex fluids using the immersed boundary method.

Engineering and Physical Sciences Research Council

Prif Ymchwiliwr

Manylion y Prosiect
Dyddiad dechrau: 01.10.2009
Dyddiad gorffen: 31.07.2015
This project is concerned with fluid-structure interaction problems using the immersed boundary method (IBM).  The IBM considers the immersed elastic structure to be part of the surrounding fluid by replacing the immersed structure with an Eulerian force density. Therefore, the interface conditions are enforced implicitly. This project applies the finite element immersed boundary method (IBM) to both Newtonian and Oldroyd-B viscoelastic fluids, where the fluid variables are approximated using the spectral element method (hence we name the method the spectral element immersed boundary method (SE-IBM)) and the immersed boundary variables are approximated using either the finite element method or the spectral element method. The IBM is known to suffer from area loss problems, e.g. when a static closed boundary is immersed in a fluid, the area contained inside the closed boundary decreases as the simulation progresses. The main source of error in such a scenario can be found in the spreading and interpolation phases. The aim of using a spectral element method is to improve the accuracy of the spreading and interpolation phases of the IBM.  We also consider a higher-order enriched method based on the extended finite element method (XFEM), which we call the eXtended Spectral Element Method (XSEM). When XSEM is applied to the SE-IBM with a viscoelastic fluid, the oscillations present in the polymeric stress components are greatly reduced.

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Diweddarwyd y tro diwethaf ar 2015-10-11 am 12:57