This study deals with the combined effects of convective heating and suction/injection on the entropy generation rate in a steady flow of an incompressible viscous fluid through a channel with permeable walls. The model equations for momentum and energy balance are solved numerically using shooting quadrature. Both the velocity and temperature profiles are obtained and utilized to compute the e...

In this work the velocity, acceleration, and jerk analyses of a two-degrees-of-freedom parallel wrist are approached by means of the theory of screws. For the sake of completeness, the finite kinematics of the manipulator is also investigated. As far as the authors are aware, the equation of jerk in screw form of the robot at hand is introduced by the first time in this contribution. In order t...

Due to some refinements in the dynamics, we can follow the overall evolution of a realistic jet numerically till its bulk velocity being as small as βc ∼ 10c. We find no obvious break in the optical light curve during the relativistic phase itself. However, an obvious break does exist at the transition from the relativistic phase to the nonrelativistic phase, which typically occurs at time t ∼ ...

The problem of a two-dimensional, unsteady flow and a heat transfer of a viscous fluid past a surface in the presence of variable suction/injection is analyzed. The unsteadiness is due to the time dependent free stream flow. The governing equations are derived with the usual boundary layer approximation. Using Lie group theory, a group classification of the equations with respect to the variabl...

The numerical simulations of property of SiC/Al co-continuous composites under compression with ANSYS software were carried out. Based on the simulation results, deformational behavior and distribution of stress and strain fields were analyzed. The effects of compression speed for material property was studied. The results showed that Al matrix and SiC reinforcement exhibit different mechanical...

We have examined and repeated earlier numerical calculations of Berger and Moncrief for the evolution of unpolarized Gowdy T 3 cosmological models. Our calculations do not always agree with theirs, and we come to the opposite conclusion: these models do not appear to develop velocity term dominated behaviour.

This paper presents a model of the excitation corresponding to the hammer impact in a hybrid piano model. An experimental setup permits the measurement of the signal at the bridge location. The signal is separated into an excitation and resonant contribution. This work focuses on the modeling of the excitation part using both physical and perceptually relevant parameters. The resulting model ca...

Three models for compositional ow in porous media, varying in physical and mathematical complexity, are considered. Various formulations of the governing equations that describe these models, including phase and global pressure-saturation formulations with the total velocity and ux, are presented. Finite element methods for solving these diierential formulations are identiied.

In this paper we discuss some features of the BCRE model. We show that this model can be understood as a mapping from a two-dimensional to a one-dimensional problem, if some conditions are satisfied. We propose some modifications that (a) guarantee mass conservation in the model (what is not assured in its original form) and (b) correct undesired behaviors that appear when there are irregularit...