| Abstract: | The modified ghost fluid method (MGFM) provides a robust and
efficient interface treatment for various multi-medium flow
simulations and some particular fluid-structure interaction (FSI)
simulations. However, this methodology for one specific class of FSI
problems, where the structure is plate, remains to be developed.
This work is devoted to extending the MGFM to treat compressible
fluid coupled with a thin elastic plate. In order to take into account
the influence of simultaneous interaction at the interface, a
fluid-plate coupling system is constructed at each time step and
solved approximately to predict the interfacial states. Then,
ghost fluid states and plate load can be defined by utilizing
the obtained interfacial states. A type of acceleration strategy in
the coupling process is presented to pursue higher efficiency.
Several one-dimensional examples are used to highlight the utility
of this method over loosely-coupled method and validate the
acceleration techniques. Especially, this method is applied to
compute the underwater explosions (UNDEX) near thin elastic plates.
Evolution of strong shock impacting on the thin elastic plate and
dynamic response of the plate are investigated. Numerical results
disclose that this methodology for treatment of the fluid-plate
coupling indeed works conveniently and accurately for different
structural flexibilities and is capable of efficiently simulating
the processes of UNDEX with the employment of the acceleration
strategy. |
