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Your search keyword '"Koumoutsakos P"' showing total 14 results
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14 results on '"Koumoutsakos P"'

4. Vortices

Author

Lopez, J. M., primary, Perry, A. D., additional, Koumoutsakos, P., additional, Leonard, A., additional, Escudier, M. P., additional, Van Heijst, G. J. F., additional, Kloosterziel, R. C., additional, Williams, C. W. M., additional, Higuchi, H., additional, Balligand, H., additional, Visbal, M., additional, Miller, G. D., additional, Williamson, C. H. K., additional, Payne, F. M., additional, Nelson, R. C., additional, Ng, T. T., additional, Rahaman, Q., additional, Alvarez-Toledo, A., additional, Parker, B., additional, Ho, C. M., additional, Leweke, T., additional, Provansal, M., additional, Ormières, D., additional, Lebescond, R., additional, Owen, J. C., additional, Szewczyk, A. A., additional, Bearman, P. W., additional, Heijst, G. J. F. Van, additional, Flór, J. B., additional, Seren, C., additional, Melander, M. V., additional, Zabusky, N. J., additional, Petitjeans, P., additional, and Hancock, R., additional

Published
2004
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5. Complex fluids

Author

Aranson, I., primary, Blair, D., additional, Vorobieff, P., additional, Metcalfe, G., additional, Shinbrot, T., additional, McCarthy, J. J., additional, Ottino, J. M., additional, Olafsen, J. S., additional, Urbach, J. S., additional, Mikkelsen, R., additional, Versluis, M., additional, Koene, E., additional, van der Bruggert, G.-W., additional, Lohse, D., additional, Tirumkudulu, M., additional, Tripathi, A., additional, Acrivos, A., additional, Walther, J. H., additional, Lee, S.-S., additional, Koumoutsakos, P., additional, Eames, I., additional, Dalziel, S. B., additional, Anna, S. L., additional, Spiegelberg, H., additional, and McKinley, G. H., additional

Published
2004
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12. Modeling, Simulation and Optimization of Anguilliform Swimmers.

Author

Kato, Naomi, Kamimura, Shinji, Kern, Stefan, Chatelain, Philippe, and Koumoutsakos, Petros

Abstract

We present a computational framework for the modeling, simulation and evolutionary optimization of anguilliform swimmers. The hydrodynamics of anguilliform swimming is investigated by solving the three-dimensional Navier-Stokes equations of incompressible flow past a self-propelled body. An inverse design procedure is employed in order to identify optimal swimming behavior. In this procedure, objectives such as swimming efficiency and burst swimming speed are pre-specified and the motion of the body is obtained through an evolutionary algorithm. The results support the hypothesis that anguilliform swimmers modify their kinematics according to different objectives. [ABSTRACT FROM AUTHOR]

Published
2008
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13. Multiresolution Particle Methods.

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, Bergdorf, Michael, and Koumoutsakos, Petros

Abstract

We present novel multiresolution particle methods with extended dynamic adaptivity in areas where increased resolution is required. The inherent Lagrangian adaptivity of smooth particle methods is complemented by adaptation of the particle size based on criteria such as flow strain and wavelet-based decomposition. In this context we present two particle multiresolution techniques: one based on globally adaptive mappings and one employing a wavelet-based multiresolution analysis of the transported quantities to guide the allocation of computational elements. Results are presented from the application of these methods to level sets and two-dimensional vortical flows. [ABSTRACT FROM AUTHOR]

Published
2007
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14. A Software Framework for the Portable Parallelization of Particle-Mesh Simulations.

Author

Sbalzarini, I. F., Walther, J. H., Polasek, B., Chatelain, P., Bergdorf, M., Hieber, S. E., Kotsalis, E. M., Koumoutsakos, P., Nagel, Wolfgang E., Walter, Wolfgang V., and Lehner, Wolfgang

Abstract

We present a software framework for the transparent and portable parallelization of simulations using particle-mesh methods. Particles are used to transport physical properties and a mesh is required in order to reinitialize the distorted particle locations, ensuring the convergence of the method. Field quantities are computed on the particles using fast multipole methods or by discretizing and solving the governing equations on the mesh. This combination of meshes and particles presents a challenging set of parallelization issues. The present library addresses these issues for a wide range of applications, and it enables orders of magnitude increase in the number of computational elements employed in particle methods. We demonstrate the performance and scalability of the library on several problems, including the first-ever billion particle simulation of diffusion in real biological cell geometries. [ABSTRACT FROM AUTHOR]

Published
2006
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