Development of a hybrid model based on mesh and meshfree methods and its application to fluid–elastic structure interaction for free surface waves. (November 2020) - Kumar, G. Manoj
Abstract: In this paper, a hybrid scheme, Fluid–Fluid–Elastic Structure (FFES) model was developed in the time domain to address the wave breaking impact on the structure. The model is developed based on the partitioned approach with different governing equations that describe various regions of the model domain. The fluid–fluid model denotes that two different fluid models were used to describe fluid in the actual physical domain. The method is a physics-based approximation to reduce the computational time, i.e. in the far-field inviscid fluid (fully nonlinear potential flow theory model), and near to the structure, viscous fluid (Navier Stokes model) is used. The coupled model then interacts with the elastic structure (based on Euler–Bernoulli beam theory). The system of equations is strongly coupled both in space and time. The Fluid–Fluid coupling uses an implicit predictor–corrector scheme, and the fluid–structure coupling works based on an iterative scheme. This approach makes the method more robust and for future extension. Three different possibilities for introducing the coupling was identified and implemented. The model was validated against results from the analytical solution and literature. The method proposed is a reliable, robust, and efficient alternative for simulating fluid–structure interaction problems. Highlights: Fluid–fluid–elastic structure model (FFES) is strongly coupled in space and time. Three different algorithms have been investigated for FFES. Robust, efficient and fast alternative to handle the complex FSI. The hybrid method is 72% faster than the full NS model for wave elastic structure interactions. The algorithms behaviour and properties are investigated numerically.