Recently in Japan, railway ballasts have been flown out several times by heavy or intense rainfalls. However, the mechanism has not yet been investigated in detail, so that the risk and the countermeasures cannot be reasonably proposed. Therefore, in this research, model tests and numerical analyses were conducted to investigate the flow-out mechanism. It was found that the seepage characterist...

This paper is a numerical study of different discretizations for a mixed formulation of the DarcyForchheimer equation. Different finite elements are used: constant functions, conformal linear functions and CrouzeixRaviart non-conformal finite elements. The behavior of the discretizations is analyzed through a comparative study of some test problems. The numerical results suggest that one of the...

Most offshore wind turbines are installed in shallow water and exposed to breaking waves. Previous numerical studies focusing on wave forces generally ignored the seabed permeability. In this paper, a model based Volume-Averaged Reynolds Averaged Navier–Stokes equations (VARANS) is employed reveal process of solitary interacting with rigid pile over permeable slope. Through applying Forchheimer...

This work deals with the numerical and experimental investigation of flow in protective filters which combine fibrous pleats absorbent cartridge. The through complete 3D geometry all parts filters, including complex pleats, is numerically modeled using high-quality computational grids. sorbent filling, textile dividers as well material filtration are porous media coefficients quadratic Forchhei...

In this contemporary research, a parametric analysis of partially filled high porosity metallic foams in horizontal conduit is performed to augment heat transfer with reasonable pressure drop. The investigation includes six different models partly aluminium foam by varying internal diameter from the wall side and external core tube. pore density ranges 10 45 PPI their varies 0.90 0.95. Flow dyn...

Porous ultra-high-temperature ceramics (UHTCs) are a candidate group of materials for transpiration cooling hypersonic vehicles due to their exceptionally high melting point, typically above 3000 K. Their operating temperature permits higher amount radiative than that achievable with conventional materials, which reduces the required coolant mass flow rate cool surface. This work experimentally...

The study of well-known Darcian fluidic streams and hybrid nanofluids is an essential need nowadays researchers in regard to their exceptional heat transfer rates implementations. significance controlling transmission cannot be overemphasized. Therefore, this article scrutinizes the Darcy Forchheimer flow nanofluid toward a flexible tube. near surface cylinder are investigated by applying Darcy...

The vertical pressure lead to increased airflow resistance through the grain bulk, which affected efficiency of ventilation and drying. effects pressures at 50, 150, 250 kPa on drop characteristics soybeans were studied using experiment numerical simulation. random packing different compression states for soybean packed beds generated by Discrete Element Method (DEM). (DEM) Computational Fluid ...