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Computation
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Selected Papers from the 7th International Conference from Scientific Computing...
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Selected Papers from the 7th International Conference from Scientific Computing to Computational Engineering (IC-SCCE 2016)

A special issue of Computation (ISSN 2079-3197). This special issue belongs to the section "Computational Engineering".

Deadline for manuscript submissions: closed (15 December 2016) | Viewed by 53788

Special Issue Editor

Prof. Dr. Demos T. Tsahalis

E-Mail Website
Guest Editor
Learning Foundation in Mechatronics (LFME), Irakleiou 17, GR-11141 Athens, Greece
Interests: mechatronics; unsteady boundary layers; separation; vortex-induced vibrations; active control; noise; vibrations; health monitoring; structures; human response; modeling; artificial neural networks; multiobjective optimization; genetic algorithms; expert systems; artificial intelligence
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Special Issue Information

Dear Colleagues,

The 7th International Conference from Scientific Computing to Computational Engineering (IC-SCCE) will be held 6–9 July, 2016, at the Divani Caravel Hotel in Athens, Greece. For more information about the conference, please visit the conference website ( www.scce.gr).

Selected papers, presented at the conference and included in the conference proceedings will be considered for inclusion in the Special Issue. The authors of the selected papers will be notified by the Conference Chairman to submit their papers to this Special Issue of the journal Computation after the conference, the latest by 15 December 2016, if they so wish. Submitted papers could be extended, from their conference size, by a minimum of 50% to include new results, if any. All submitted papers will undergo the Journal’s standard peer-review procedure. Accepted papers will be published in Open Access format in Computation and collected together in this Special Issue website. There are no page/publication charges for this journal.

As there are no publication charges for this journal, please prepare and format your paper according to the Instructions for Authors. Use the LaTeX or Microsoft Word template file of the journal (both are available from the Instructions for Authors page). Manuscripts should be submitted online via the susy.mdpi.com editorial system.

Prof. Dr. Demos Tsahalis
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Computation is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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Published Papers (7 papers)

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Research

1807 KiB  
Article
An Information Technology Framework for the Development of an Embedded Computer System for the Remote and Non-Destructive Study of Sensitive Archaeology Sites
by Iliya Georgiev and Ivo Georgiev
Computation 2017, 5(2), 21; https://doi.org/10.3390/computation5020021 - 5 Apr 2017
Cited by 2 | Viewed by 5059
Abstract
The paper proposes an information technology framework for the development of an embedded remote system for non-destructive observation and study of sensitive archaeological sites. The overall concept and motivation are described. The general hardware layout and software configuration are presented. The paper concentrates [...] Read more.
The paper proposes an information technology framework for the development of an embedded remote system for non-destructive observation and study of sensitive archaeological sites. The overall concept and motivation are described. The general hardware layout and software configuration are presented. The paper concentrates on the implementation of the following informational technology components: (a) a geographically unique identification scheme supporting a global key space for a key-value store; (b) a common method for octree modeling for spatial geometrical models of the archaeological artifacts, and abstract object representation in the global key space; (c) a broadcast of the archaeological information as an Extensible Markup Language (XML) stream over the Web for worldwide availability; and (d) a set of testing methods increasing the fault tolerance of the system. This framework can serve as a foundation for the development of a complete system for remote archaeological exploration of enclosed archaeological sites like buried churches, tombs, and caves. An archaeological site is opened once upon discovery, the embedded computer system is installed inside upon a robotic platform, equipped with sensors, cameras, and actuators, and the intact site is sealed again. Archaeological research is conducted on a multimedia data stream which is sent remotely from the system and conforms to necessary standards for digital archaeology. Full article
(This article belongs to the Special Issue Selected Papers from the 7th International Conference from Scientific Computing to Computational Engineering (IC-SCCE 2016))
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1212 KiB  
Article
An Accurate Computational Tool for Performance Estimation of FSO Communication Links over Weak to Strong Atmospheric Turbulent Channels
by Theodore D. Katsilieris, George P. Latsas, Hector E. Nistazakis and George S. Tombras
Computation 2017, 5(1), 18; https://doi.org/10.3390/computation5010018 - 18 Mar 2017
Cited by 22 | Viewed by 5352
Abstract
The terrestrial optical wireless communication links have attracted significant research and commercial worldwide interest over the last few years due to the fact that they offer very high and secure data rate transmission with relatively low installation and operational costs, and without need [...] Read more.
The terrestrial optical wireless communication links have attracted significant research and commercial worldwide interest over the last few years due to the fact that they offer very high and secure data rate transmission with relatively low installation and operational costs, and without need of licensing. However, since the propagation path of the information signal, i.e., the laser beam, is the atmosphere, their effectivity affects the atmospheric conditions strongly in the specific area. Thus, system performance depends significantly on the rain, the fog, the hail, the atmospheric turbulence, etc. Due to the influence of these effects, it is necessary to study, theoretically and numerically, very carefully before the installation of such a communication system. In this work, we present exactly and accurately approximate mathematical expressions for the estimation of the average capacity and the outage probability performance metrics, as functions of the link’s parameters, the transmitted power, the attenuation due to the fog, the ambient noise and the atmospheric turbulence phenomenon. The latter causes the scintillation effect, which results in random and fast fluctuations of the irradiance at the receiver’s end. These fluctuations can be studied accurately with statistical methods. Thus, in this work, we use either the lognormal or the gamma–gamma distribution for weak or moderate to strong turbulence conditions, respectively. Moreover, using the derived mathematical expressions, we design, accomplish and present a computational tool for the estimation of these systems’ performances, while also taking into account the parameter of the link and the atmospheric conditions. Furthermore, in order to increase the accuracy of the presented tool, for the cases where the obtained analytical mathematical expressions are complex, the performance results are verified with the numerical estimation of the appropriate integrals. Finally, using the derived mathematical expression and the presented computational tool, we present the corresponding numerical results, using common parameter values for realistic terrestrial free space optical communication systems. Full article
(This article belongs to the Special Issue Selected Papers from the 7th International Conference from Scientific Computing to Computational Engineering (IC-SCCE 2016))
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2751 KiB  
Article
Evaluation of Soil-Structure Interaction on the Seismic Response of Liquid Storage Tanks under Earthquake Ground Motions
by Mostafa Farajian, Mohammad Iman Khodakarami and Denise-Penelope N. Kontoni
Computation 2017, 5(1), 17; https://doi.org/10.3390/computation5010017 - 12 Mar 2017
Cited by 23 | Viewed by 8278
Abstract
Soil-structure interaction (SSI) could affect the seismic response of structures. Since liquid storage tanks are vital structures and must continue their operation under severe earthquakes, their seismic behavior should be studied. Accordingly, the seismic response of two types of steel liquid storage tanks [...] Read more.
Soil-structure interaction (SSI) could affect the seismic response of structures. Since liquid storage tanks are vital structures and must continue their operation under severe earthquakes, their seismic behavior should be studied. Accordingly, the seismic response of two types of steel liquid storage tanks (namely, broad and slender, with aspect ratios of height to radius equal to 0.6 and 1.85) founded on half-space soil is scrutinized under different earthquake ground motions. For a better comparison, the six considered ground motions are classified, based on their pulse-like characteristics, into two groups, named far and near fault ground motions. To model the liquid storage tanks, the simplified mass-spring model is used and the liquid is modeled as two lumped masses known as sloshing and impulsive, and the interaction of fluid and structure is considered using two coupled springs and dashpots. The SSI effect, also, is considered using a coupled spring and dashpot. Additionally, four types of soils are used to consider a wide variety of soil properties. To this end, after deriving the equations of motion, MATLAB programming is employed to obtain the time history responses. Results show that although the SSI effect leads to a decrease in the impulsive displacement, overturning moment, and normalized base shear, the sloshing (or convective) displacement is not affected by such effects due to its long period. Full article
(This article belongs to the Special Issue Selected Papers from the 7th International Conference from Scientific Computing to Computational Engineering (IC-SCCE 2016))
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29679 KiB  
Article
Aerodynamic Performance of a NREL S809 Airfoil in an Air-Sand Particle Two-Phase Flow
by Dimitra C. Douvi, Dionissios P. Margaris and Aristeidis E. Davaris
Computation 2017, 5(1), 13; https://doi.org/10.3390/computation5010013 - 28 Feb 2017
Cited by 17 | Viewed by 9322
Abstract
This paper opens up a new perspective on the aerodynamic performance of a wind turbine airfoil. More specifically, the paper deals with a steady, incompressible two-phase flow, consisting of air and two different concentrations of sand particles, over an airfoil from the National [...] Read more.
This paper opens up a new perspective on the aerodynamic performance of a wind turbine airfoil. More specifically, the paper deals with a steady, incompressible two-phase flow, consisting of air and two different concentrations of sand particles, over an airfoil from the National Renewable Energy Laboratory, NREL S809. The numerical simulations were performed on turbulence models for aerodynamic operations using commercial computational fluid dynamics (CFD) code. The computational results obtained for the aerodynamic performance of an S809 airfoil at various angles of attack operating at Reynolds numbers of Re = 1 × 106 and Re = 2 × 106 in a dry, dusty environment were compared with existing experimental data on air flow over an S809 airfoil from reliable sources. Notably, a structured mesh consisting of 80,000 cells had already been identified as the most appropriate for numerical simulations. Finally, it was concluded that sand concentration significantly affected the aerodynamic performance of the airfoil; there was an increase in the values of the predicted drag coefficients, as well as a decrease in the values of the predicted lift coefficients caused by increasing concentrations of sand particles. The region around the airfoil was studied by using contours of static pressure and discrete phase model (DPM) concentration. Full article
(This article belongs to the Special Issue Selected Papers from the 7th International Conference from Scientific Computing to Computational Engineering (IC-SCCE 2016))
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11800 KiB  
Article
Numerical Modelling of Double-Steel Plate Composite Shear Walls
by Michaela Elmatzoglou and Aris Avdelas
Computation 2017, 5(1), 12; https://doi.org/10.3390/computation5010012 - 22 Feb 2017
Cited by 9 | Viewed by 7597
Abstract
Double-steel plate concrete composite shear walls are being used for nuclear plants and high-rise buildings. They consist of thick concrete walls, exterior steel faceplates serving as reinforcement and shear connectors, which guarantee the composite action between the two different materials. Several researchers have [...] Read more.
Double-steel plate concrete composite shear walls are being used for nuclear plants and high-rise buildings. They consist of thick concrete walls, exterior steel faceplates serving as reinforcement and shear connectors, which guarantee the composite action between the two different materials. Several researchers have used the Finite Element Method to investigate the behaviour of double-steel plate concrete walls. The majority of them model every element explicitly leading to a rather time-consuming solution, which cannot be easily used for design purposes. In the present paper, the main objective is the introduction of a three-dimensional finite element model, which can efficiently predict the overall performance of a double-steel plate concrete wall in terms of accuracy and time saving. At first, empirical formulations and design relations established in current design codes for shear connectors are evaluated. Then, a simplified finite element model is used to investigate the nonlinear response of composite walls. The developed model is validated using results from tests reported in the literature in terms of axial compression and monotonic, cyclic in-plane shear loading. Several finite element modelling issues related to potential convergence problems, loading strategies and computer efficiency are also discussed. The accuracy and simplicity of the proposed model make it suitable for further numerical studies on the shear connection behaviour at the steel-concrete interface. Full article
(This article belongs to the Special Issue Selected Papers from the 7th International Conference from Scientific Computing to Computational Engineering (IC-SCCE 2016))
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2686 KiB  
Article
Virtual Prototyping and Validation of Cpps within a New Software Framework
by Sebastian Neumeyer, Konrad Exner, Simon Kind, Haygazun Hayka and Rainer Stark
Computation 2017, 5(1), 10; https://doi.org/10.3390/computation5010010 - 18 Feb 2017
Cited by 5 | Viewed by 8992
Abstract
As a result of the growing demand for highly customized and individual products, companies need to enable flexible and intelligent manufacturing. Cyber-physical production systems (CPPS) will act autonomously in the future in an interlinked production and enable such flexibility. However, German mid-sized plant [...] Read more.
As a result of the growing demand for highly customized and individual products, companies need to enable flexible and intelligent manufacturing. Cyber-physical production systems (CPPS) will act autonomously in the future in an interlinked production and enable such flexibility. However, German mid-sized plant manufacturers rarely use virtual technologies for design and validation in order to design CPPS. The research project Virtual Commissioning with Smart Hybrid Prototyping (VIB-SHP) investigated the usage of virtual technologies for manufacturing systems and CPPS design. Aspects of asynchronous communicating, intelligent- and autonomous-acting production equipment in an immersive validation environment, have been investigated. To enable manufacturing system designers to validate CPPS, a software framework for virtual prototyping has been developed. A mechatronic construction kit for production system design integrates discipline-specific models and manages them in a product lifecycle management (PLM) solution. With this construction kit manufacturing designers are able to apply virtual technologies and the validation of communication processes with the help of behavior models. The presented approach resolves the sequential design process for the development of mechanical, electrical, and software elements and ensures the consistency of these models. With the help of a bill of material (BOM)- and signal-based alignment of the discipline-specific models in an integrated mechatronic product model, the communication of the design status and changes are improved. The re-use of already-specified and -designed modules enable quick behavior modeling, code evaluation, as well as interaction with the virtualized assembly system in an immersive environment. Full article
(This article belongs to the Special Issue Selected Papers from the 7th International Conference from Scientific Computing to Computational Engineering (IC-SCCE 2016))
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16608 KiB  
Article
Numerical and Computational Analysis of a New Vertical Axis Wind Turbine, Named KIONAS
by Eleni Douvi, Dimitra Douvi, Dionissios Margaris and Ioannis Drosis
Computation 2017, 5(1), 8; https://doi.org/10.3390/computation5010008 - 11 Jan 2017
Viewed by 8198
Abstract
This paper concentrates on a new configuration for a wind turbine, named KIONAS. The main purpose is to determine the performance and aerodynamic behavior of KIONAS, which is a vertical axis wind turbine with a stator over the rotor and a special feature [...] Read more.
This paper concentrates on a new configuration for a wind turbine, named KIONAS. The main purpose is to determine the performance and aerodynamic behavior of KIONAS, which is a vertical axis wind turbine with a stator over the rotor and a special feature in that it can consist of several stages. Notably, the stator is shaped in such a way that it increases the velocity of the air impacting the rotor blades. Moreover, each stage’s performance can be increased with the increase of the total number of stages. The effects of wind velocity, the various numbers of inclined rotor blades, the rotor diameter, the stator’s shape and the number of stages on the performance of KIONAS were studied. A FORTRAN code was developed in order to predict the power in several cases by solving the equations of continuity and momentum. Subsequently, further knowledge on the flow field was obtained by using a commercial Computational Fluid Dynamics code. Based on the results, it can be concluded that higher wind velocities and a greater number of blades produce more power. Furthermore, higher performance was found for a stator with curved guide vanes and for a KIONAS configuration with more stages. Full article
(This article belongs to the Special Issue Selected Papers from the 7th International Conference from Scientific Computing to Computational Engineering (IC-SCCE 2016))
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