Πλοήγηση ανά Θέμα "Boundary conditions"
Αποτελέσματα 1-20 από 26
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Advanced numerical solution algorithms for modern em wave propagation problems
(2016)The development of high-order, finite-difference time-domain (FDTD) schemes for modeling and investigating radio-wave propagation problems are presented in this work. The electromagnetic waves can be reproduced precisely ... -
Analysis of airflow through experimental rural buildings: Sensitivity to turbulence models
(2007)Full-scale experimental data and computational fluid dynamics (CFD) methods are used to determine the accuracy of four different turbulence models [standard k-ε, k-ε renormalisation group (RNG), k-ε realisable, Reynolds ... -
Closed-Form Solution of the Bending Two-Phase Integral Model of Euler-Bernoulli Nanobeams
(2022)Recent developments have shown that the widely used simplified differential model of Eringen’s nonlocal elasticity in nanobeam analysis is not equivalent to the corresponding and initially proposed integral models, the ... -
Concise and accurate solutions to half-space binary-gas flow problems defined by the McCormack model and specular-diffuse wall conditions
(2004)An analytical version of the discrete-ordinates method (the ADO method) is used to establish concise and particularly accurate solutions to the viscous-slip and the half-space thermal-creep problems for a binary gas mixture. ... -
Deformation vs. flow and wavelet-based models of gradient plasticity: Examples of axial symmetry
(2006)The modest goal of this article - the first in a series of three dedicated to Kirk Valanis - is to discuss and compare (in terms of their constitutive and variational formulation, boundary conditions and size-dependent ... -
An evaluation of models and computational approaches for the barrier properties of coatings containing flakes of high aspect ratio
(2019)We report on the results of a comprehensive two-dimensional computational study of diffusion across disordered flake composites. Our objective is (1) the evaluation of existing literature models for the effect of flake ... -
Gas flow and heat transfer simulation in MEMS via a mesoscopic approach
(2004)The flow problem of binary gaseous mixtures in rectangular micro channels due to small pressure, temperature and molar concentration gradients over the whole range of the Kn number is solved. The solution is based on a ... -
Gas flow in a grooved channel due to pressure and temperature gradients
(2006)The flow of a gas in a grooved nano or micro channel, due to the imposed pressure and temperature gradients in the longitudinal direction, is investigated via a kinetic approach. The solution is valid in the whole range ... -
Gas-surface interaction in rarefied gas flows through long capillaries via the linearized Boltzmann equation with various boundary conditions
(2022)Reliable gas–surface interaction modeling is of major importance in consistent simulation of rarefied gas flows with applications in vacuum technology and micro-electromechanical systems. The effectiveness of the most ... -
Gradient elasticity and size effect for the borehole problem
(2018)It has been shown recently that robust gradient models of elasticity offer an effective tool to resolve existing difficulties (e.g., elimination of singularities) or predict new experimentally observed phenomena (e.g., ... -
Investigation of transient heat transfer in multi-scale PCM composites using a semi-analytical model
(2021)This paper presents a semi-analytical model to describe the transient heat transfer in phase change material (PCM)-based composites. One such example is micro-encapsulated paraffin in gypsum plaster walls for building ... -
The McCormack model: Channel flow of a binary gas mixture driven by temperature, pressure and density gradients
(2004)An analytical version of the discrete-ordinates method (the ADO method) is used to establish concise and particularly accurate solutions to the problems of Poiseuille flow, thermal-creep flow and diffusion flow for a binary ... -
A non-local plasticity model for porous metals with deformation-induced anisotropy: Mathematical and computational issues
(2021)A non-local (gradient) plasticity model for porous metals that accounts for deformation-induced anisotropy is presented. The model is based on the work of Ponte Castañeda and co-workers on porous materials containing ... -
Numerical modelling and analysis of turbulent flow in an open channel with submerged vegetation
(2017)Turbulent flow in an open channel whose bed is covered with vegetation is studied. Vegetation has been modeled by a series of small diameter rigid cylinders protruded vertically from the channel bed. 3-D computations were ... -
On the effect of the boundary conditions and the collision model on rarefied gas flows
(2011)In this work, the effect of the gas-surface interaction law and of the intermolecular collision model is examined by solving, using the DSMC method, the heat transfer problem between parallel plates and the non-isothermal ... -
Packetostatics: Deployment of massively dense sensor networks as an electrostatics problem
(2005)We investigate the spatial distribution of wireless nodes that can transport a given volume of traffic in a sensor network, while requiring the minimum number of wireless nodes. The traffic is created at a spatially ... -
Pipe response under concentrated lateral loads and external pressure
(2006)The paper focuses on the denting the response of pipeline segments subjected to lateral quasi-static wedge loading, in the presence of internal pressure. Nonlinear finite element models of pipeline segments, which are in ... -
Pretwisted beam subjected to thermal loads: A gradient thermoelastic analogue
(2017)It is well known from the classical torsion theory that the cross section of a prismatic beam subjected to end torsional moments will rotate and warp in the longitudinal direction. Rotation is depicted through the angle ... -
A procedure for factoring and solving nonlocal boundary value problems for a type of linear integro-differential equations
(2021)The aim of this article is to present a procedure for the factorization and exact solution of boundary value problems for a class of n-th order linear Fredholm integro-differential equations with multipoint and integral ... -
Reconsideration of the implicit boundary conditions in pressure driven rarefied gas flows through capillaries
(2019)The pressure driven rarefied gas flow through plane channels and tubes of various lengths is solved in a wide range of the gas rarefaction parameter by implementing the implicit boundary conditions for the incoming ...