This paper presents the results of a study carried out to determine the change in wave climate around an array of hypothetical wave devices. The main objective of this work is to investigate the change in wave height in the upstream and downstream of the devices for different levels of wave absorption. This is achieved by modeling the wave devices as porous structures with different porosity le...

An experimental study was carried out to investigate seabed-pipeline interactions with regard soil liquefaction. For a high proportion (30 60%) of fine sediment, four groups tests were configured reproduce liquefaction around pipelines for different initial pipe depths, densities and wave conditions (wave height period). The focused on verifying the theoretically computed areas failure by analy...

This paper evaluates the performance of two numerical wave models, GHOST and STWAVE, with measurements made in an idealized inlet physical model. The emphasis of this paper is on the overall performance of these models in coastal inlets. Both wave models are similar in that they employ a finite-difference method to solve the wave action conservation equation for the steady-state wave spectral t...

Wave impacts on vertical caissons may cause breakwaters failures. This paper focuses the analysis of stability under violent wave by using a triple-coupled Fluid-Porous-Solid model. The fluid model is described Volume-Averaged Reynolds-Averaged Navier-Stokes equations in which nonlinear Forchheimer for porous medium are added to inertia terms. solid model, based DDA method an implicit DEM metho...

In this article an Archimedean spiral antenna is designed and analyzed that has good operation in broadband application. By analyzing this design, the effects that different parameters have on antenna operation will be studied and ways of optimization will be found.  Influences of cavity height and number of turns to obtain good matching and gain in a frequency interval of 4 to 18 GHz will be d...

Wave propagation is used as an advanced tool of determining elastic properties of rocks. In spite of being cheap and non destructive tests of rock mechanics, due to its modernity method is not yet replacing the traditional dear and destructive tests. In order to pave ways of replacing this test and making best use of it all effective factors of such method are to be assessed. One fundamental fa...

Effect of various forms currents on regular nonlinear waves in shallow water is investigated by use a computational fluid dynamics approach. A range wave conditions with different heights and periods are considered. three types these investigated, namely (i) uniform current over the depth, (ii) shear from seafloor to still-water level, (iii) custom profile that changes depth. The profiles consi...

The present paper discusses effects the fluid segments size on temperature profile as well as mixing performance in microreactors under nonisothermal conditions. In the reactors, exothermic parallel-series reaction systems having different ratio of activation energy proceeds with the cooling through walls of a fixed temperature. Reactant fluids are fed by the form of fluid segment. The width of...

Seawalls are sheltering structures used for protecting the coastal regions against wave induced forces. Because of random nature of the wave behavior, application of physical models for the study of wave-structure interaction can be quite efficient. In the present research, physical models of thin flexible walls were constructed and tested in a wave flume subject to generated random waves. The ...