| Outline of Annual Research Achievements |
The final target of this research is to develop a reliable adaptive and multi-physics computational method for hydroelastic FSI (Fluid-Structure Interactions) encountered in ocean/coastal engineering. Regarding Adaptivity (multi-resolution computations), an adaptive MPS-based hydroelastic FSI solver has been developed in 2D [1]. In parallel, successful development is made in SPH context and a journal paper has been submitted to Ocean Engineering journal and a domestic presentation was also made in this regard [2]. In parallel, extensions to 3D have also been made for FSI solvers incorporating both Newtonian and Hamiltonian structure models and a manuscript has just been submitted to Journal of Fluids and Structures on 3D MPS-HMPS FSI solver. A concise conference paper on extensions of the solver to 3D has also been published [3]. As for the multi-physics topic, a challenge that has been successfully tackled corresponds to presence of material discontinuities in structures and the FSI solver has been extended to model FSI consisting of composite structures. A manuscript has been prepared and will be soon submitted to Computer Physics Communications.
[1] Khayyer, A., Tsuruta, N., Shimizu, Y., Gotoh, H., Applied Ocean Research, 82, 397-414, January 2019.
[2] Khayyer, A., Shimizu, Y., Gotoh, H., Hattori, S. 66th Domestic Conference of Coastal Engineering, October 2019.
[3] Khayyer, A., Gotoh, H., Shimizu, Y., Nishijima, Y. 14th SPHERIC International Workshop. Exeter, UK, June 2019.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The targeted advancements for development of an adaptive multi-physics Fluid-Structure Interaction (FSI) have been achieved to a satisfactory level. Schemes related to Adaptivity have been well developed and incorporated. As for multi-physics matter, a coupled projection-based ISPH-HSPH (Hamiltonian SPH) has been developed along with scrupulous validations for both HSPH structure model and ISPH-HSPH FSI solver. The presented solver has been successfully applied to hydroelastic slamming of composite sandwich panels and the related manuscript will be soon submitted to Computer Physics Communications. As for another topic related to the multi-physics aspect, a multi-phase air-water model that has been recently developed [4] needs to be further enhanced and incorporated for a comprehensive air-water-structure interactions and this would be among this year's research focus. In this regard, the recently developed BM scheme [5] would be effective to enhance the stability and accuracy of the solver.
[4] Khayyer, A., Gotoh, H, Shimizu, Y., Computers & Fluids 179, 356-371, January 2019.
[5] Wang, L., Khayyer, A., Gotoh, H., Jiang, Q., Zhang, C. Applied Ocean Research 86, 320-339, January 2019.
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| Strategy for Future Research Activity |
I. During the conducted research and based on achieved results, an important matter has been highlighted, that is, importance of variational consistency of formulations. Previously a contact model, such as DEM-based contact algorithm or stress point integration was planned to be applied for modeling composite laminated structures. However, followed by a careful study on thermoelasticity and variational consistency of Hamiltonian mechanics, a Hamiltonian SPH structure model was coded and was well validated to reproduce dynamics of composite structures as well as their interactions with fluid flows without any requirement for special treatment at the material interface. The research will continue with extensions of the solver to three-dimensions with more validations as well as possible modeling of anisotropic structural properties in three-dimensions.
II. Followed by rigorous development of the hydroelastic FSI consisting of composite structures, inclusion of air will be carefully considered and the multi-phase air-water model will be precisely incorporated first in two-dimensions and then in three-dimensions.
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