A numerical study of wave propagation in a confined mixing layer by eigenfunction expansions. Physics of Fluids A: Fluid Dynamics (), 5 (6), pp. – Hu, F. Q., Jackson, T., Lasseigne, D., and Grosch, C. E. (). Absolute–convective instabilities and their associated wave packets in a compressible reacting mixing layer. Numerical study of the flow and passive scalar transport in an open-channel confluence with a flat and a degraded fixed bed, Numerical simulation of non-uniform bed-load transport using a Lagrangian method and probabilistic Exner equation, Wave propagation in porous structures based on ISPH method, M. Ramos-Ortega. It is shown by using a Dispersion-Relation-Preserving finite difference scheme that it is feasible to perform direct numerical simulation of acoustic wave propagation problems. The finite difference equations of the scheme have essentially the same Fourier-Laplace transforms and hence dispersion relations as the original linearized Euler equations over a broad range of wavenumbers (here. One of the reasons for this is that when a seismic wave propagates through fluid‐saturated formations containing heterogeneities in the mesoscopic scale range, that is, at scales smaller than the prevailing wavelengths but larger than the typical grain size, it experiences significant attenuation and phase velocity dispersion due to a.

This paper presents a numerical study of the dynamic compaction (DC) process, based on the finite element method, with the main attention on the role of water content on the soil response. Dynamic compaction is one of the most cost-effective techniques available for soil improvement, where the soil is compacted by repeatedly dropping free. The effect of the duct wall roughness on the shock wave attenuation is also studied. The main flow diagnostic used in the experimental part is either an interferometric study or alternating shadow–schlieren diagnostics. The photos obtained provide a detailed description of the flow evolution inside the ducts investigated. The principal application targeted is wave propagation in aeroacoustics in collaboration with Airbus SAS, where the source of inhomogeneity is the non-uniform flow, but the methods considered in this project will also apply to other variable material properties such as permittivity or sound speed. MIT's Department of Mechanical Engineering (MechE) offers a world-class education that combines thorough analysis with hands-on discovery. One of the original six courses offered when MIT was founded in , MechE's faculty and students conduct research that pushes boundaries and provides creative solutions for the world's problems.

A nonstandard wave equation, established by Galbrun in , is used to study sound propagation in nonuniform flows. Galbrun’s equation describes exactly the same physical phenomenon as the linearized Euler’s equations (LEE) but is derived from an Eulerian–Lagrangian description and written only in term of the Lagrangian perturbation of the displacement. Vladimir Prokofev, Multilayer open flow model: A simple pressure correction method for wave problems, International Journal for Numerical Methods in Fluids, /fld, 86, 8, (), (). Simulation Study on the Process of Pressure Wave Propagation for High-Pressure Common Rail Diesel Engine In this paper, pressure fluctuation in a high-pressure common rail system has been investigated through numerical simulation method. By establishing a three-dimensional (3D) model and one-dimensional (1D) simulation model of a. In this study, the NEWTANK (numerical wave tank) model [9, 10], which is a well-validated numerical model using a large eddy simulation, is employed to predict runup heights of nonlinear waves that passed a submerged structure in the surf zone. Reduced runup heights are predicted and their characteristics in terms of wave reflection.