We study the flow of a micropolar fluid in thin domain with microstructure, i.e., thickness $$\varepsilon $$ which is perforated by periodically distributed solid cylinders size $$a_\varepsilon . A main feature this dependence characteristic length on small parameters describing geometry porous medium under consideration. Depending ratio respect to , we derive three different generalized Darcy ...

A study of dry ice growth on bundled (duplex) cylinders has been performed using icing wind tunnel experiments and computational fluid dynamics (CFD) numerical simulations. The aim this is to "fill the gaps" in works Wagner (2010) Qing et al. (2018). simulations cover a range possible conditions by varying operating speed, median volume diameter, for some cases-the angle incidence between cylin...

We consider a thin multidomain of R consisting of two vertical cylinders, one placed upon the other: the first one with given height and small cross section, the second one with small thickness and given cross section. The first part of this paper is devoted to analyze, in this thin multidomain, a ”static Landau-Lifshitz equation”, when the volumes of the two cylinders vanish. We derive the lim...

An extension of the Donnell and Wan analysis for the buckling of a shell with initial imperfections is presented for a mode of arbitrary profile. Results for a mode with 26 arbitrary parameters are given with charts of the stress-strain characteristics for cylinders with initial displacements of between one-eighth and five times the skin thickness of the cylinder. A direct optimisation of the e...

Breaking waves interaction with two tandem cylinders are numerically studied using Computational Fluid Dynamic (CFD) software OpenFOAM. The effects of transverse inclined angles the downstream cylinder and separation distances between on breaking wave loads free surface elevations investigated. interface air water phases is captured by Volume (VOF) method. Shear Stress Transport k−ω(SSTk−ω) tur...

The deterioration of bond strength between reinforcing steel and concrete as a result of impressed cathodic current with respect to the exposure time was investigated. A current in the magnitude of 3ma/ft2 (based on reinforcing rebar area) was used for a period of five years. Chemical analyses for sodium (Na+), potassium (K+) and chloride (Cl-) ions in concrete cylinders were performed as a fun...

The Objective of this study is to estimate the form drag due to vegetated weirlike obstacles. Head loss due to submerged vegetated dikes and groins has been modeled by expansion loss form drag model (Energy and momentum balance principles) and it has been compared with experimental data. An experimental study has been carried out on a scaled physical model in the Laboratory of Environmental Flu...

introduction spect projections are contaminated by scatter radiation, resulting in reduced image contrast and quantitative errors. backscatter constitutes a major part of the scatter contamination in lower energy windows. the current study is an evaluation of the effect of backscatter material on fwhm and image quality investigated by monte carlo simulation. materials and methods simind program...