This article presents a 3-D semi-analytical model of partially superconducting axial flux modulation machine for the computation density distribution, torque, and eddy-current losses in armature. The coil magnetic field by bulks is calculated solving Maxwell’s equations scalar potential with variable separation method. Using Fourier series analysis convolution theorem, bulk region modeled domai...

Accurate permeability estimation has always been a concern in determining flow units, assigning appropriate capillary pressure andrelative permeability curves to reservoir rock types, geological modeling, and dynamic simulation.Acoustic method can be used as analternative and effective tool for permeability determination. In this study, a four-step approach is proposed for permeability estimati...

An important application of borehole acoustic logging is the determination of formation permeability using Stoneley waves. Heterogeneous permeable structures, such as fractures, sand-shale sequences, etc., are commonly encountered in acoustic logging. The purpose of this study is to investigate the effects of the permeability heterogeneities on the borehole Stoneley wave propagation, We have st...

Abstract This paper presents a framework for modelling the random variation in permeability cement-admixed soil based on binder content and thereby relating coefficient of to unconfined compressive strength clay. The strength–permeability relationship was subsequently implemented finite element method (RFEM). effects spatial both clays RFEM is illustrated using two examples concerning one-dimen...

reservoir permeability is a critical parameter for characterization of the hydrocarbon reservoirs. in fact, determination of permeability is a crucial task in reserve estimation, production and development. traditional methods for permeability prediction are well log and core data analysis which are very expensive and time-consuming. well log data is an alternative approach for prediction of pe...

The interaction of sub-surface, gravity-driven flows with inclusions different permeabilities are investigated theoretically using a model that exploits the relative shallowness motion. Numerically computed solutions for steady motion around cylindrical reveal range behaviors dependent on ratio interior to exterior permeability and dimensionless flow parameter measures far-field thickness produ...

The hydraulic permeability of single-layer fibrous media is studied through two-dimensional (2D) and three-dimensional Navier-Stokes based flow simulations. As simple representations of such materials, one-dimensional arrays of parallel cylinders as well as two-dimensional arrays of perpendicularly crossing cylinders were used. The distance between the cylinders was either constant (ordered lay...