This article explicates the blood flow across an artery with multiple stenosis at outer wall and a thrombus centre. The symmetric non-symmetric shapes are both considered in this study. Entropy analysis is also taken into account for detailed study of irreversibility. governing equations interpreted provided boundary conditions exact mathematical solutions developed. Further, these elucidated g...

In the last decade, parameter-free approaches to shape optimization problems have matured a state where they provide versatile tool for complex engineering applications. However, sensitivity distributions obtained from derivatives in this context cannot be directly used as update gradient-based strategies. Instead, an auxiliary problem has solved obtain gradient sensitivity. While several choic...

fifty years ago warren and root have introduced the shape factor. this fundamental parameter for modeling of naturally fractured reservoirs has been discussed stormily ever since. different definitions for shape factor have been suggested which all of them are heuristically based. recently, heinemann and mittermeir mathematically derived - based on the dual-continuum theorem assuming pseudo-ste...

PURPOSE To evaluate the classification of punctal stenosis based on the shape of the external punctum, clinical characteristics and histopathologic features. METHODS Patients who experienced tearing and were diagnosed with punctal stenosis were evaluated in this study. Punctal stenosis was classified according to the shape of the lower external punctum, which included membranous type, slit ty...

abstract land surface hydrological models has importance in the determination of soil moisture and temperature, the rate of evapotranspiration, stream flow by emphasis on the land surface physical and dynamic process descriptions. in this research, vic land surface hydrological model has been used for the land surface temperature and stream flow determination. the vic runoff simulation in each ...

the present study is an attempt to investigate some features of radial basis functions (rbfs) approximation methods related to variational problems. thereby authors applied some properties of rbfs to develop a direct method which reduces constrained variational problem to a static optimization problem. to assess the applicability and effectiveness of the method, some examples are examined. dyna...

The present study deals with the functional severity of a coronary artery stenosis assessed by the fractional flow reserve (FFR). The effects of different geometrical shapes of lesion on the diagnostic parameters are unknown. In this study, 3D computational simulation of blood flow in three different geometrical shapes of stenosis (triangular, elliptical, and trapezium) is considered in steady ...

In this study, the flow characteristics through symmetric stenosis artery are investigated. The shape of eccentricity for stenotic flows is limited by circularcross sections and plaques usually assumed to be oriented concentrically. The governing equations are the usual Navier-Stokes equations and are numerically solved by using finite volume method in arbitrary orthogonal curvilinear coordinat...

Aortic valve area can be measured by cardiac catheterization, Doppler echocardiography, or imaging planimetry to assess aortic stenosis severity. These diagnostic techniques provide the Gorlin area, the effective orifice area (EOA) and the geometric orifice area (GOA), respectively. The differences between these three parameters depend mainly on the valve inflow shape and cross-sectional area o...

OBJECTIVES The shape of the flow-volume (F-V) curve is known to change to showing a prominent plateau as stenosis progresses in patients with tracheal stenosis. However, no study has evaluated changes in the F-V curve according to the degree of bronchial stenosis in patients with unilateral main bronchial stenosis. METHODS We performed an analysis of F-V curves in 29 patients with unilateral ...