Computational Materials

Our vision, goal and what we do

Simulations heat transfer and mechanical stress of FCC metal in multiscale framework.

Computer simulations are one of the most fascinating tools made available due to the development of modern computational technology. Simulations in physics, chemistry, materials science, engineering etc. allow us to obtain detailed information of the phenomena of interest and provide often complete 3D and time dependent information of quantities like electromagnetic fields, temperature, forces and mechanical stresses, deformations. Such information leads to deep insights and understanding of nature around us, opening ways to understand complex physical and chemical processes and to the development of novel technologies and applications.

The simulation activities conducted in the lab involve all levels from atomistic to macroscopic (DFT -> Molecular Dynamics -> Monter Carlo -> Finite Elements), including combinations of these methods i.e. multi scale simulations. The core capacity involves both, computational studies of materials and development of new methodology.

Some examples of applications:

• Mechanics
• CFD (turbulent & laminar)
• Heat transport
• Electric and magnetic fields
• Chemical reactions
• Acoustics
• Multiphysics combinations of these phenomena!

Image gallery

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  Some simulation results

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  "Shear strain field around nanovoid in MD and FEM"

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  "Animation of stress and deformation in Cu during tensile testing"

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Tools we use

• Comsol Multiphysics [1]
• LAMMPS [2]
• DEAL.II open source finite element library [3]
• OpenFOAM CFD [4]
• FEMOCS (https://github.com/veskem/femocs)

Research Projects

Ongoing Activities

• PUT 1372 - Mechanisms of vacuum arching in high electric field systems

Glory and Success

• PUT 57 - Multiscale simulations of dislocation generation in rf electric fields in the linear accelerator design (01.01.2013 - 31.12.2016)
• ETF 9216 - Development and optimization of 3D-microbatteries (01.01.2012-31.21.2015)

Student projects

• Materjalidefektide simuleerimine kõrgetes elektriväljades
• Järgmise generatsiooni bioreaktorid
• Ehitiste konstruktsioonielementide multiskaala mudelite arendamine

Members

Vahur Zadinsenior researcher (finite element modelling, molecular dynamics, high electric fields, CERN))

Tarmo Tammseniour researcher

Simon Vigonski

Heiki Kasemägisenior researcher (ion-conducting polymer, computer simulations) & Computer engineering study programme manager

Priit Priimägi

Kristian KuppartPhD student (MD in high electric fields)

Faiza SummerPhD student (Flow-capacitor)

Robert Aarestudent (FEM simulations, TTM)

Ats Aasmaastudent (modelling of microbatteries)

Mihkel Veskein Helsinki University

Friends and collaborators

• Flyura Djurabekova (Helsinki University)
• Ville Jansson (Helsinki University)
• Walter Wuench (CERN)
• Daniel Brandell (Uppsala University)

Publications

(All references in Harvard style from Google Scholar)

1. Baibuz, E., Vigonski, S., Lahtinen, J., Zhao, J., Jansson, V., Zadin, V. and Djurabekova, F., 2018. Data sets of migration barriers for atomistic Kinetic Monte Carlo simulations of Cu self-diffusion via first nearest neighbour atomic jumps. Data in Brief, 17, pp.739-743
2. Zadin, V., Veske, M., Vigonski, S., Jansson, V., Muszynski, J., Parviainen, S., Aabloo, A. and Djurabekova, F., 2018. Simulations of surface stress effects in nanoscale single crystals. Modelling and Simulation in Materials Science and Engineering.
3. Metspalu, T., Jansson, V., Zadin, V., Avchaciov, K., Nordlund, K., Aabloo, A. and Djurabekova, F., 2018. Cu self-sputtering MD simulations for 0.1–5 keV ions at elevated temperatures. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 415, pp.31-40.
4. Vigonski, S., Jansson, V., Vlassov, S., Polyakov, B., Baibuz, E., Oras, S., Aabloo, A., Djurabekova, F. and Zadin, V., 2017. Au nanowire junction breakup through surface atom diffusion. Nanotechnology, 29(1), p.015704.
5. Kyritsakis, A., Veske, M., Eimre, K., Zadin, V. and Djurabekova, F., 2017. Thermal runaway and evaporation of metal nano-tips during intense electron emission. arXiv preprint arXiv:1710.00050.
6. Priimägi, P., Kasemägi, H., Aabloo, A., Brandell, D. and Zadin, V., 2017. Thermal Simulations of Polymer Electrolyte 3D Li-Microbatteries. Electrochimica Acta, 244, pp.129-138.
7. Baibuz, E., Vigonski, S., Lahtinen, J., Zhao, J., Jansson, V., Zadin, V. and Djurabekova, F., 2017. Migration barriers for surface diffusion on a rigid lattice: challenges and solutions. arXiv preprint arXiv:1707.05765.
8. Veske, M., Kyritsakis, A., Eimre, K., Zadin, V., Aabloo, A. and Djurabekova, F., 2017. Dynamic coupling of a finite element solver to large-scale atomistic simulations. arXiv preprint arXiv:1706.09661.
9. Yanagisawa, H., Zadin, V., Kunze, K., Hafner, C., Aabloo, A., Kim, D.E., Kling, M.F., Djurabekova, F., Osterwalder, J. and Wuensch, W., 2016. Laser-induced asymmetric faceting and growth of a nano-protrusion on a tungsten tip. APL Photonics, 1(9), p.091305.
10. Mets, M., Antsov, M., Zadin, V., Dorogin, L.M., Aabloo, A., Polyakov, B., Lõhmus, R. and Vlassov, S., 2016. Structural factor in bending testing of fivefold twinned nanowires revealed by finite element analysis. Physica Scripta, 91(11), p.115701.
11. CLIC, T., Boland, M.J., Felzmann, U., Giansiracusa, P.J., Lucas, T.G., Rassool, R.P., Balazs, C., Charles, T.K., Afanaciev, K., Emeliantchik, I. and Ignatenko, A., 2016. Updated baseline for a staged Compact Linear Collider. arXiv preprint arXiv:1608.07537.
12. Priimägi, P., Brandell, D., Srivastav, S., Aabloo, A., Kasemägi, H. and Zadin, V., 2016. Optimizing the design of 3D-pillar microbatteries using finite element modelling. Electrochimica Acta, 209, pp.138-148.
13. Veske, M., Kyritsakis, A., Djurabekova, F., Aare, R., Eimre, K. and Zadin, V., 2016, July. Atomistic modeling of metal surfaces under high electric fields: Direct coupling of electric fields to the atomistic simulations. In Vacuum Nanoelectronics Conference (IVNC), 2016 29th International (pp. 1-2). IEEE.
14. Veske, M., Parviainen, S., Zadin, V., Aabloo, A. and Djurabekova, F., 2016. Electrodynamics—molecular dynamics simulations of the stability of Cu nanotips under high electric field. Journal of Physics D: Applied Physics, 49(21), p.215301.
15. Vigonski, S., Veske, M., Aabloo, A., Djurabekova, F. and Zadin, V., 2015. Verification of a multiscale surface stress model near voids in copper under the load induced by external high electric field. Applied Mathematics and Computation, 267, pp.476-486.
16. Zadin, V., Kasemägi, H., Valdna, V., Vigonski, S., Veske, M. and Aabloo, A., 2015. Application of multiphysics and multiscale simulations to optimize industrial wood drying kilns. Applied Mathematics and Computation, 267, pp.465-475.
17. Eimre, K., Parviainen, S., Aabloo, A., Djurabekova, F. and Zadin, V., 2015. Application of the general thermal field model to simulate the behaviour of nanoscale Cu field emitters. Journal of Applied Physics, 118(3), p.033303.
18. Vigonski, S., Djurabekova, F., Veske, M., Aabloo, A. and Zadin, V., 2015. Molecular dynamics simulations of near-surface Fe precipitates in Cu under high electric fields. Modelling and Simulation in Materials Science and Engineering, 23(2), p.025009.
19. Zadin, V., Krasheninnikov, A.V., Djurabekova, F. and Nordlund, K., 2015. Simulations of electromechanical shape transformations of Au nanoparticles. physica status solidi (b), 252(1), pp.144-148.
20. Zadin, V., Pohjonen, A., Aabloo, A., Nordlund, K. and Djurabekova, F., 2014. Electrostatic-elastoplastic simulations of copper surface under high electric fields. Physical Review Special Topics-Accelerators and Beams, 17(10), p.103501.
21. Zadin, V., Brandell, D., Kasemägi, H., Lellep, J. and Aabloo, A., 2013. Designing the 3D-microbattery geometry using the level-set method. Journal of Power Sources, 244, pp.417-428.

Defended theses

Masters Theses

• Kristjan Eimre
• Kristian Kuppart
• Robert Aare

Bachelor's theses

• Kristjan Eimre - title
• Kristian Kuppart - title