In this paper, numerical simulation for a two-dimensional viscous and incompressible flow past the elliptical airfoil is presented by Random Vortex Blob (RVB). RVB is a numerical technique to solve the incompressible, two-dimensional and unsteady Navier-Stocks equations by converting them to rotational non-primitive formulations. In this method, the velocity vector at a certain point can be cal...

The permeability and tortuosity of pore-scale two and three-dimensional random porous media were calculated using the Lattice Boltzmann method (LBM). Effects of geometrical parameters of medium on permeability and tortuosity were investigated as well. Two major models of random porous media were reconstructed by computerized tomography method: Randomly distributed rectangular obstacles in a uni...

The Kelvin–Voigt model for a thin stratified two-dimensional visco-elastic strip is analyzed both in the quasistatic and dynamic cases. Neumann boundary conditions on upper lower parts of periodicity with respect to longitudinal variable are stated. A complete asymptotic expansion solution constructed cases, by using dimension reduction combined homogenization technique. error between exact one...

purpose : to report two cases of orbitofrontal cholesterol granuloma, which is a rare progressive destructive disease case reports : we report two patients with orbitofrontal cholesterol granuloma a 50-year-old man and a 20-year-old woman both with progressive proptosis due to a cystic lesion in the superior part of the orbit with frontal bone erosion and intracranial extension. the second case...

Abstract Background Limb gangrene in neonates is an extremely rare clinical problem and very few cases have been recorded up to now. The clinical findings were mild involvement of skin to full necrosis and gangrene of the involved regions. Unfortunately, in most cases the etiology cannot be established. However, a variety of etiological causes may account for this condition. Case Presentatio...

Background & Importance: Spinal deformity is one of the most common disorders among the vertebral diseases that results from unnatural curvatures of spine, such as scoliosis and kyphosis. Spinal fusion surgery is used most commonly to treat certain types of spinal deformity. Herein, we reported the efficacy of posterior spinal fusion accompanied by instrumentation in patients with the...