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Feb 12, 2018Open AccessArticle
In several areas of
engineering, it is
possible to put real problems in mathematical functions; when we represent a problem with variables in the
form of function, we were
able to extract various information from it. This paper compared two different
mathematical methods, being the finite difference method and the Fourth Order
RangeKutta method, to analyze the concentration and temperature of ...
Jan 22, 2018Open AccessArticle
Instability of liquid
dielectrics surface, being developing after the action of an alternating
current corona discharge pulse, has been experimentally investigated. Voltage
amplitude on the corona electrode reaches 70 kV, frequency is 17 MHz, and pulse
duration is 0.51 μs. This is similar to
rosewindow instability at electrode height above the liquid surface > 510 mm. At lesser heights,
development of a singular crater is ob ...
Dec 24, 2015Open AccessArticle
This paper presents results of a modeled open channel flow through a
porous media (River). In the model, we considered water as an incompressible
fluid; the flow as steady and uniform; the system is assumed to be isothermal
and the flow pattern is laminar. We have solved the resulting Brinkman equation
using analytical method. By some mathematical operation, the momentum partial
differential equation (PDE) was reduced to ordinary differential equation (ODE)
and the resulting equations are solved...
Nov 23, 2015Open AccessArticle
The paper analyzes the nonlinear damping torque and nonlinear restoring moment
and establishes the nonlinear motion equation of ship rolling under random sea.
The RungeKutta method is used in the time domain to solve the equation, and to
simulate the time history of random wave excitation ship rolling and free decay
process. This paper used the ship attitude inertial measurement system and its
algorithm technology to construct the ship rolling angle from the acceleration
measuring signals and t...
Jun 19, 2015Open AccessArticle
The fact is that it is always attempted to develop suitable motivation factors satisfying company management needs in this very sensitive as well as vital aspects of development. Each of existing approaches at some point has been applied and tested as to its effects on people’s lives, jobs, and personal goals in life as well as in the work place. Honestly, it is very difficult to find out motivation factors, which can be used in wide areas of management process. There is no flexible manner of fa...
Feb 13, 2015Open AccessArticle
In this work, the effect of transverse horizontal electric field on the
stability of three layers of immiscible liquids is illustrated. The fluids are
subjected to a uniform horizontal electric field. Analytical and numerical
simulations of this system of linear evolution equations are performed. The
solutions of the linearized equations of motion and the boundary conditions
lead to deriving two simultaneous Mathieu equations of damping terms having
complex coefficients. The effects of the strea...
Feb 06, 2015Open AccessArticle
The nonuniqueness of the relation between the pressure gradients of
general relativity and its Newtonian counterpart is demonstrated. This may lead
to a nonunique relation between the two force laws.
Dec 25, 2014Open AccessArticle
In this paper, a
Lattice Boltzmann method was used to simulate the flow of temperaturesensitive
magnetic fluids in a micro porous cavity. According to Navier’s linear slip
length model, slip boundary conditions were used on all the walls of the micro
porous cavity. The effects of the horizontal slip length and the vertical slip
length on the flow and heat transfer characteristics were investigated. The results
showed that with the increase of the slip length, the velocities and their
gradients ...
Oct 31, 2014Open AccessArticle
In this paper, the Magnetohydrodynamic (MHD) Flow of
Viscous Fluid over a Nonlinear Stretching Sheet is investigated numerically.
The partial differential equations governing the flow are reduced to a non
linear ordinary differential equations by using similarity transformations. The
resulting
transformed equations are numerically solved by an explicit finite difference
scheme known as the Keller Box Method. The velocity profiles are determined
and the effects of the magnetic parameter and non l...
Sep 17, 2014Open AccessArticle
Variations in level of fluid in wells caused by
Earth tides and earthquakes are governed by two leading processes: deformation
of medium and filtration. These processes are described by identical systems of
equations and are united by the term “hydrodynamical phenomena”. The exact
solution is obtained for the problem of level variations in wells due to Earth
tides. The similar problem is solved for shortterm precursors of a tectonic
earthquake. Results are consistent with data of field observat...
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