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I am a post-doctoral researcher at the Universiteit Antwerpen and at the
Kapeldreef 75, B-3001 Leuven, Belgium
Interests and current research
- High Performance Computing, HPC
- Iterative methods for sparse linear algebra
- Stencil computations and memory-aware code optimizations
- Communication-avoiding numerical algorithms
- Energy efficient computing
Recent publications
- W. van Aarle, P. Ghysels, J. Sijbers, W. Vanroose
Memory access optimization for iterative tomography on many-core architectures.
Submitted to Fully3D 2013.
- P. Ghysels, W. Vanroose.
Hiding global synchronization latency in the preconditioned Conjugate Gradient algorithm.
Submitted to Parallel Computing. Technical report.
For the code, see the development branch of PETSc, commit
- T. J. Ashby, P. Ghysels, W. Heirman, W. Vanroose.
Implementing Krylov Methods by Pipelining to Tolerate Global Communication Latency at Extreme Scales.
12th International Conference on Algorithms and Architectures for Parallel Processing. PDF
- P. Ghysels, T.J. Ashby, K. Meerbergen, W. Vanroose.
Hiding global communication latency in the GMRES algorithm on massively parallel machines.
SIAM J. Sci. Comput. 35-1 (2013), pp. C48-C71. Technical report.
The p1-GMRES method has been implemented in PETSc (3.3) by Jed Brown, see KSPPGMRES
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P. Ghysels, P. Klosiewics, W. Vanroose.
Improving the arithmetic intensity of multigrid with the help of polynomial smoothers.
In Special Issue of Numerical Linear Algebra with Applications (CopperMountain 2011 Conference).
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W. Heirman, T.E. Carlson, P. Ghysels, W. Vanroose, L. Eeckhout.
Using Fast and Accurate Simulation to Explore Hardware/Software Trade-offs in the Multi-Core Era.
ParCo 2011. 2011
Past research
I have done my PhD at the Katholieke Universiteit Leuven under the supervision of Dirk Roose and Giovanni Samaey on multiscale methods for the simulation of mechanical deformation of biological tissue. This was a nice collaboration with people from the MeBioS (Mechatronics,
Biostatistics and Sensors) division of the Department of Biosystems at the K.U.Leuven.
PhD thesis
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Coupling of Fine and Coarse Scale Models for the Simulation of Viscoelastic Plant Tissue
- From Cellular Structure to Homogeneous Material.
Available online here, contact me for more info.
Journal Publications
- P. Van Liedekerke, P. Ghysels, E. Tijskens, G. Samaey, D. Roose H. and Ramon.
Mechanisms of soft cellular tissue bruising. A particle based simulation approach.
Soft Matter, 7, 3580-3591, 2011.
- P. Ghysels, G. Samaey, P. Van Liedekerke, E. Tijskens, H. Ramon and D. Roose.
Coarse implicit time integration of a cellular scale particle model for plant tissue deformation.
International Journal for Multiscale Computational Engineering, 8(4):411-422, 2010.
- P. Ghysels, G. Samaey, P. Van Liedekerke, E. Tijskens, H. Ramon and D. Roose.
Multiscale Modeling of Viscoelastic Plant Tissue.
International Journal for Multiscale Computational Engineering, 8(4):379-396, 2010.
- P. Van Liedekerke, E. Tijskens, H. Ramon, P. Ghysels, G. Samaey and D. Roose.
Particle-based model to simulate the micromechanics of biological cells.
Physical Review E, 81(6),061906, 15 pages, 2010.
- P. Van Liedekerke, P. Ghysels, E. Tijskens, G. Samaey, B. Smeedts, D. Roose and H. Ramon.
A particle-based model to simulate the micromechanics of single-plant parenchyma cells and aggregates.
Physical Biology, 7(026006):026006, 2010.
- P. Ghysels, G. Samaey, E. Tijskens, P. Van Liedekerke, H. Ramon, and D. Roose.
Multi-scale simulation of plant tissue deformation using a model for individual cell mechanics.
Physical Biology, 6(016009):016009, 2009.
Proceedings papers
- P. Ghysels, G. Samaey, P. Van Liedekerke, E. Tijskens, H. Ramon, and D. Roose.
Multiscale modeling of viscoelastic plant tissue.
ECCM 2010, IV European Conference on Computational Mechanics Palais des Congrès Paris, France, May 16-21, 2010. Extended abstract.
- P. Van Liedekerke, P. Ghysels, E. Tijskens, G. Samaey, D. Roose and H. Ramon.
A 3D particle model to simulate the micromechanics of a spherical biological cell.
Conference Particle Based Methods, Barcelona, Spain, November 25-27, 2009. ISBN 978-84-96736-82-5.
- P. Ghysels, G. Samaey, E. Tijskens, H. Ramon, and D. Roose.
A Micro-Macro Method for the Simulation of Plant Tissue Deformation.
Proceedings of the Sixth International Conference on Engineering Computational Technology, Athens, Greece, September 2008, M. Papadrakakis and B.H.V. Topping, Civil-Comp Press.
- P. Van Liedekerke, P. Ghysels, E. Tijskens, G. Samaey, D. Roose and H. Ramon.
A particle based model to simulate the dynamics of plant cells.
In Proceedings of the 4th international SPHERIC workshop, Nantes, France, 2009.
Masters thesis
- Ontwikkeling van een parallele lattice Boltzmann simulator.
Under supervision of Dirk Roose, Wim Vanroose and Pieter Van Leemput
In Dutch, contact me for more info.
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