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Ymittos Athens, Greece

Ladopoulos E.G.,Interpaper Research Organization
Forschung im Ingenieurwesen/Engineering Research | Year: 2012

The coupling of the Singular Integral Operators Method (SIOM) and the Finite Element Method (FEM) is proposed and investigated for the solution of plate bending problems. Such combination of the above two numerical methods gives more accurate results for the solution of plate bending problems in structural analysis. The plates are basic units of building frame structures, as well as to underground structures and thus the determination of bending moments around the plates is very important for the analysis of all kinds of structures. An application of plate bending problems is finally given to the determination of the bending moments in a rectangular plate with a rectangular hole in the center of the plate. © Springer-Verlag 2012. Source


Ladopoulos E.G.,Interpaper Research Organization
Archives of Mechanics | Year: 2013

A two-dimensional unsteady cascade aeroelasticity is introduced for the in- vestigation of flow fields of turbomachines (gas or steam). Especially, the velocity field around a cascade of airfoils is determined, while such a problem is reduced to the solution of a non-linear multidimensional singular integral equation when con- sidering harmonic time dependence between the motions of adjacent blades of the turbine. Consequently, a general non-linear model is investigated by proposing an "innovative" and " groundbreaking" method. An application is finally presented by considering a special description of the velocity field and therefore such a field is determined for arbitrary geometry and arbitrary interblade phase angle. Copyright © 2013 by IPPT PAN. Source


Ladopoulos E.G.,Interpaper Research Organization
International Journal of Non-Linear Mechanics | Year: 2011

A two-dimensional aerodynamics representation analysis is introduced for the investigation of inviscid flowfields of unsteady airfoils. The problem of the unsteady flow of a two-dimensional NACA airfoil is therefore reduced to the solution of a non-linear multidimensional singular integral equation, when the form of the source and vortex strength distribution is dependent on the history of the above distribution on the NACA airfoil surface. An application is given to the determination of the velocity and pressure coefficient field around an aircraft by assuming constant source distribution. © 2011 Elsevier Ltd. All rights reserved. Source


Ladopoulos E.G.,Interpaper Research Organization
Acta Mechanica | Year: 2011

A new mathematical model is proposed in order to determine the properties of the reservoir materials, when oil reserves are moving through porous media, which is a very important problem of petroleum reservoir engineering. Thus, the above problem is reduced to the solution of a non-linear singular integral equation, which is numerically evaluated by using the singular integral operators method (SIOM). Also, several properties of the porous medium equation, which is a Helmholtz differential equation, are analyzed and investigated. An application is finally given for a well testing to be checked when an heterogeneous oil reservoir is moving in a porous medium. By using the SIOM, the pressure response from the well test conducted in the above heterogeneous oil reservoir is calculated. © 2011 Springer-Verlag. Source


Ladopoulos E.G.,Interpaper Research Organization
International Journal of Oil, Gas and Coal Technology | Year: 2012

By using a non-linear 3-D elastic waves real-time expert system, the new theory of 'real-time expert seismology' is proposed, for the exploration of the on-shore and off-shore oil and gas reserves all over the world. This highly innovative and groundbreaking technology is working under real time logic for searching the on-shore and off-shore petroleum reserves developed on the continental crust and in deeper water ranging from 300 m to 2,500 m, or even deeper. Furthermore, for the determination of the properties of the reservoir materials, when oil reserves mixed with water in multiphase flows are moving through porous media, a new mathematical device is proposed. The above problem is very much important for petroleum reservoir engineering and the oil industry. Hence, such a problem is reduced to the solution of a non-linear singular integral equation, which is numerically evaluated by using the singular integral operators method (SIOM). Also, several properties are analysed and investigated for the porous medium equation, defined as a Helmholtz differential equation. [Received: February 28, 2012; Accepted: March 18, 2012]. Copyright © 2012 Inderscience Enterprises Ltd. Source

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