This work investigates the sensitivity analysis of vibrating laminated composite rectangular plates in interaction with INVISCID FLUID using the modified higher-order shear deformation plate theory. The EFAST method which is based on variance and is independent of any assumption of linearity and uniformity between inputs and outputs is utilized for sensitivity analysis of laminated composite rectangular plates. Theoretical formulations, both for the laminated rectangular plates in interaction with INVISCID, incompressible and irrotational FLUID and the sensitivity analysis technique are summarized here. A Cartesian coordinate system is used to describe governing equations of FLUID-structure interaction. Hamilton's variational principle is used to derive the Eigen problem of the complex system. A numerical investigation is carried out by using the Galerkin method and the boundary conditions of the plate are simply supported. A set of admissible displacement functions which satisfy identically the geometric boundary conditions are used to calculate the wet natural frequencies of the plate. In the numerical examples, the effect of the aspect ratio, thickness ratio and material orthotropy orientation of the plate, depth ratio and width of the FLUID on the fundamental natural frequency of the vibrating laminated composite rectangular plates are examined and discussed.

The present investigation deals with the reflection and transmission phenomenon due to incident plane longitudinal wave at a plane interface between INVISCID FLUID half-space and a thermoelastic diffusion solid half-space with dual-phase-lag heat transfer (DPLT) and dual-phase-lag diffusion (DPLD) models. The theory of thermoelasticity with dual-phase-lag heat transfer developed by Roychoudhary [10] has been employed to develop the equation for thermoelastic diffusion with dual-phase-lag heat transfer and dual-phase-lag diffusion model. Amplitude ratios and energy ratios of various reflected and transmitted waves are obtained. It is found that these are the functions of angle of incidence, frequency of incident wave and are influenced by thermoelastic diffusion properties of media. The nature of dependence of amplitude ratios and energy ratios with the angle of incidence have been computed numerically for a particular model. The variations of energy ratios with angle of incidence are also shown graphically. The conservation of energy at the interface is verified. Some special cases are also deduced from the present investigation.

In this paper, an explicit finite element based numerical procedure is presented for simulating three-dimensional INVISCID compressible flow problems. The implementation of the first-order upwind method and a higher-order artificial dissipation technique on unstructured grids, using tetrahedral elements, is described. Both schemes use a multi-stage Runge-Kutta time-stepping method for time integration. The use of an edge-based data structure in the finite element formulation and its computational merits are also elaborated. Furthermore, the performance of the two schemes in solving a benchmark problem involving transonic flow about an ONERA M6 wing is compared and detailed solutions are presented.

In this paper, three new schemes based on normalized variable diagram (NVD) to calculate convection term of conservative equations are developed. The solution technique is of the finite volume type utilizing a co-located arrangement for storage of variables and a uniform mesh. The working variables are velocity and pressure which makes the schemes applicable to both compressible and in compressible flows. The interpolation of these schemes has been done with smooth functions and this point improves the convergence and accuracy of the solution. These methods are applied to the computation of steady transonic over bump in channel geometry as well as to the transient shock-tube problem. The results are compared with other computations published in the literature.

The present investigation is to study the surface wave propagation in a swelling porous elastic half space under homogeneous INVISCID liquid layer. The frequency equation is derive for both swelling porous (SP) and without swelling porous (elastic medium) (EL) medium. The dispersion curves giving the phase velocity and attenuation coefficient with wave number are plotted graphically to depict the effect of swelling porous half space under a homogeneous INVISCID liquid layer. The amplitudes of displacement in both SP and EL medium are obtained and are shown graphically. Some special cases are also deduced from the present investigation.

This study introduces a two-dimensional thermoelastic model for a homogeneous isotropic half-space with double porosity underlying an INVISCID liquid half-space featuring temperature variations. The model incorporates the three-phase lag (TPL) heat equation and reveals that in the solid half-space, four coupled longitudinal waves intertwine with one uncoupled transverse wave, while one mechanical wave ripples through the liquid half-space. The investigation highlights dispersion, attenuation, and other effects affected by the thermal properties and the presence of voids. Using plane wave solutions and boundary conditions at the interface, a concise expression for the frequency equation of the model has been derived. Furthermore, the magnitudes of the displacements in the solid half-space and liquid half-spaces, the temperature change, and the volume fractional fields at the interface have been precisely determined. In the graphical section, computer-simulated results of various wave profiles for magnesium crystal material have been generated for different heat conduction thermoelastic models. The study's implications span various fields, such as hydrology, engineering, ultrasonics, navigation, and electronics.

In this paper, Weakly Compressible Smoothed Particle Hydrodynamics (WCSPH) method was used to numerically simulate the three dimensional dam-break with obstacle in front of the flow. Euler equations as governing equations of INVISCID FLUID flow were used. Large and unphysical oscillations in pressure and velocity field are one of the most important problems in this method. In present study these oscillations were controlled by using density filter and conservative Riemann solvers, and results of these two methods were compared with experimental data. Furthermore due to common using of artificial viscosity in WCSPH method, the simulation was implemented using artificial viscosity in momentum equations without density filtering and compared with last two methods. This comparison showed that the conservative Riemann solvers could well control the oscillations in pressure and velocity field and gives correct pressure results in WCSPH method. Finally two boundary conditions called dynamic and Repulsive forces were investigated in this paper.