TY - EJOU
AU - Pal, Priyaranjan
TI - Frequencies of Lock Gate Structure Coupled with Reservoir Fluid
T2 - Sound \& Vibration
PY - 2020
VL - 54
IS - 3
SN - 2693-1443
AB - This study determines the natural frequencies of the lock gate structure,
considering the coupled effect of reservoir fluid on one side using the finite element method (FEM). The gate is assumed to be a uniformly thick plate, and its
material is isotropic, homogeneous, and elastic. The reservoir fluid is assumed
to be inviscid and incompressible in an irrotational flow field. The length of the
reservoir domain is truncated using the far boundary condition by adopting the
Fourier series expansion theory. Two different assumptions on the free surface,
i.e., undisturbed and linearized, are considered in the fluid domain analysis.
The computer code is written based on the developed finite element formulations.
The natural frequencies of the lock gate are computed when interacting with and
without reservoir fluid. Several numerical problems are studied considering the
effects of boundary conditions, aspect ratios, and varying dimensions of the gate
and the fluid domain. The frequencies of gate reduce significantly due to the presence of fluid. The frequencies increase when the fluid extends to either side of
the gate. The frequencies reduce when the depth of the fluid domain above the
top edge of the gate increases. The frequencies drop considerably when the free
surface condition is taken into account. The results of frequencies of lock gate
structure may be useful to the designer if it is experienced in natural catastrophes.
KW - Lock gate; reservoir fluid; fluid-structure interaction; frequency; HSDT; FEM
DO - 10.32604/sv.2020.010679