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5. Contributors

Author

Ab Rahman, N.H., primary, Ahmed, I., additional, Amine Chelihi, M., additional, Ariffin, A., additional, Choo, K.-K.R., additional, Christopher, L., additional, Conti, M., additional, Dargahi, T., additional, Dehghantanha, A., additional, Elutilo, A., additional, Epiphaniou, G., additional, Kessler, G.C., additional, Mahmod, R., additional, Martini, B., additional, Mohtasebi, S.H., additional, Muda, Z., additional, Ogazi-Onyemaechi, B.C., additional, Papadopoulos, C., additional, Petraityte, M., additional, Tassone, C., additional, Yang, T.Y., additional, Yunos, Z., additional, and Yusoff, M.N., additional

Published
2017
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16. Cracked Continuous Rotors Vibrating on Nonlinear Bearings.

Author

Papadopoulos, C. A., Chasalevris, A. C., and Nikolakopoulos, P. G.

Abstract

The dynamic behavior of cracked rotors continues to attract the interest of both designers and maintenance engineers. In this work, a continuum mechanics approach is used to simulate rotor vibration. The case of the cracked continuous rotor is examined by introducing suitable complex boundary conditions. The shaft rotates on two journal bearings that are simulated as forces acting on it and the boundary conditions are expressed accordingly. When the angular velocity passes through critical speeds, these forces become highly nonlinear. Identifications of cracking and wear of the bearing are separately investigated. The current challenge for design engineers is to provide lighter, quieter, more efficient, compact, and stable, as well as less expensive and ecologically friendly, rotating machines, operating even in severe conditions. In other words, new targets must be seen from the following three points of view: (a) analysis and design, (b) new material technology, and (c) new production techniques. [ABSTRACT FROM AUTHOR]

Published
2011
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17. Passive Scalar and Dissipation Simulations with the Linear Eddy Model.

Author

Barth, Timothy J., Griebel, Michael, Keyes, David E., Nieminen, Risto M., Roose, Dirk, Schlick, Tamar, Kassinos, Stavros C., Langer, Carlos A., Iaccarino, Gianluca, Moin, Parviz, Papadopoulos, C., and Sardi, K.

Abstract

The purpose of this work was to extend knowledge on the potential of the Linear Eddy Model (LEM) to reproduce scalar statistics that are relevant to the modelling of turbulent combustion. In this context, emphasis was placed on the evolution of the scalar dissipation and its conditional moments. To allow for a systematic and quantitative analysis on the sensitivity of model to its input parameters, LEM has been employed as a stand alone model with prescribed flow field properties rather than being incorporated in an LES code as a subgrid model. Results from twelve parametric LEM computations are compared to experiments and DNS data from non-combusting and reactive turbulent mixing layers. It is shown that the LEM model reproduces a number of important features of scalar fields. However, input parameters are shown to significantly influence the model behaviour so that care is required when employing the model particularly at early times. [ABSTRACT FROM AUTHOR]

Published
2007
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