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Arora K.,DOCD | Deshpande S.M.,EMU
Lecture Notes in Computational Science and Engineering | Year: 2011

Meshfree methods are gaining popularity over the conventional CFD methods for computation of inviscid and viscous compressible flows past complex configurations. The main reason for the growth of popularity of these methods is their ability to work on any point distribution. These methods donot require the grid for flow simulation, which is an essential requirement for all other conventional CFD methods. However these methods are limited by the requirement of a good connectivity around a node. Here, a very robust form of the meshfree method called Weighted Least Squares Kinetic Upwind Method using Eigendirections (WLSKUMED) has been used to avoid the problem of code divergence due to the bad connectivity. In WLSKUM-ED, the weights are calculated to diagonalize the least squares matrix A (w) such that the x and y directions become the eigen directions along which the higher dimensional least squares formulae reduce to the corresponding one dimensional formulae. Here an effort has been made to explain the enhanced robustness of the WLSKUM-ED meshfree method over the conventional LSKUM meshfree method. The accuracy of the kinetic meshfree method for the Euler equations has been enhanced by use of entropy variables and inner iterations in the defect correction method. It is observed that the use of entropy variables and inner iterations in the defect correction method helps in obtaining the formasl order of accuracy in case of a non-uniform point distribution. © 2011 Springer-Verlag Berlin Heidelberg.

Moazam S.,EMU | Nalbantoglu Z.,EMU | Celikag M.,EMU
Mathematical Problems in Engineering | Year: 2015

Wave propagation in an unbounded domain surrounding the stimulation resource is one of the important issues for engineers. Past literature is mainly concentrated on the modelling and estimation of the wave propagation in partially layered, homogeneous, and unbounded domains with harmonic properties. In this study, a new approach based on the Finite Point Method (FPM) has been introduced to analyze and solve the problems of wave propagation in any nonhomogeneous unbounded domain. The proposed method has the ability to use the domain properties by coordinate as an input. Therefore, there is no restriction in the form of the domain properties, such as being periodical as in the case of existing similar numerical methods. The proposed method can model the boundary points between phases with trace of errors and the results of this method satisfy both conditions of decay and radiation. © 2015 S. Moazam et al.

AlHendi H.,EMU | Celikag M.,EMU
Journal of Constructional Steel Research | Year: 2015

The significance of this parametric study initiates from the need for further understanding of the behavior of semi-rigid/partial-strength I-beam to tubular column connections. This research attempted to gain a qualitative understanding of the influence of the geometrical configurations of reverse channel connections (RCC) on the moment-rotation (M-φ) response. Hence, ABAQUS (v.6.12) software was used to develop three-dimensional (3-D) FE models for thirty specimens. The FE models developed were validated against the experimental results available from literature where 268 FE models were used for sensitivity analysis. The main emphasis of this research was on the stiffness, strength, sources of deformability, rotational capacity and failure mechanisms of the RCC. All tests were able to achieve a rotational capacity beyond the minimum 0.03 rad, in most cases more than 0.06 rad and in one case reached 0.16 rad. For the same configuration of RCC, it was found that the channel wall thickness to the flush end-plate thickness ratio is the key to the rotational capacity of RCC. In addition, the deformability of the column face was mainly dependent on the ratio of channel depth to square hollow section (SHS) width and the minimum value of this ratio is recommended to be kept equal to 0.72. © 2014 Elsevier Ltd. All rights reserved.

Sefidgari B.L.,EMU | Shamchi S.P.,EMU
Applied Mechanics and Materials | Year: 2014

This research paper investigates the optimal solution to increase the productivity of production line by the assistance of decision making and job scheduling algorithms. Through the help of FCFS algorithm which was utilized in Task Queue, as well as Multi-Level Feedback for decision making and job scheduling, the minimization of idle times during the process is expected. Moreover in case of any tardiness of machines, system immediately sends feedback to renovate the machine station. Basically the novel RFID technology (Radio Frequency Identification) is used for any data transaction between system structures, including: reading, storing and categorizing the information to each tag that attached to pieces. Besides, the software has been developed for managing the global database. All in all the current system which is based on optimal suggestion of algorithms is under implementation in the CIM laboratory of Eastern Mediterranean University. © (2014) Trans Tech Publications, Switzerland.

Thantanapally C.,EMU | Singh S.,EMU | Patil D.V.,EMU | Succi S.,Instituto Applicazioni Calcolo Mauro Picone | Ansumali S.,EMU
International Journal of Modern Physics C | Year: 2013

Recently, it was shown that energy conserving (EC) lattice Boltzmann (LB) model is more accurate than athermal LB model for high-resolution simulations of athermal flows. However, in the sub-grid (SG) domain, the behavior is found to be opposite. In this work, we show that via multi-relaxation model, it is possible to preserve the accuracy of the EC LB for both SG and direct numerical simulation (DNS) models. We show that by introducing a nonunit Prandtl number, under-resolved simulations can also be performed quite efficiently, a property which we attribute to the enhanced sound-relaxation. © World Scientific Publishing Company.

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