How key physical processes in deep geological repository are affected by temperature changes?

Abhishek Gupta, Ayman Abed and me have suggested what key processes to model in a deep geological repository, as affected by temperature. The research is published in Engineering Geology journal (link). It seems that especially changes of the water vapour density with temperature, changes of viscosity of water with temperature, and the changes in the water retention curve (in our case, van Genuchten with thermal coupling) are important and may make tens or more percent of difference. Thermal expansion of water is also very important when the material is fully saturated.

Water mass flux in y-direction in the infiltration test, most affected by the thermal effects on the water vapour density and water viscosity changes with temperature. (c) Abhishek Gupta, Ayman A. Abed, Wojciech T. Sołowski, Identification of key thermal couplings affecting the bentonite behaviour in a deep geological nuclear waste repository, Engineering Geology, Volume 324, 2023, 107251, https://doi.org/10.1016/j.enggeo.2023.107251,
https://www.sciencedirect.com/science/article/pii/S0013795223002697

The research was co-funded by EURAD gas subproject and Aalto University Dean’s scholarship. (EURAD – European joint programme on radioactive waste management (Gas subproject). EURAD has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement n°847593)

Compact It Project Granted

It has been very busy weeks, turning into busy months and without noticing, almost a year has passed. The main news is that I got a Academy of Finland project, Compact It, and we still are looking for a researcher who would be interested to take part. Your task will be to use and develop Granular Material Point Method and Uintah software suite, to model dynamic soil exchange. The project will involve close cooperation with Menard and build over resaerch from 2013. You can find the advertisement at Aalto webpage. The position is open until filled. Please apply, I try to check the applications weekly!

Granular MPM

We got new paper published on Granular Material Point Method in Computers & Structures. We are proud of the paper, where we show how you can get continuous material discontinuous during the flow, and then, continuous again. Thanks to that, we can have the silo filled properly 🙂

Silo filling simulation, Granular MPM
Silo filling simulation, Granular CPDI

Are you interested? We have open positions for a post-doctoral position, open until 14th of June 2021. Contact me for more information, as you will have to show your multidisciplinary approach in the application. Good luck!

Few more presentations…

A statue of a mermaid sitting on a rock, surrounded by water.
Photo: CreativeCommons (author AVDA Berlin), see more

Last month I had a pleasure to give presentations on MPM and modelling of clays at Chalmers University, Technical University of Denmark (DTU) and Hamburg University of Technology (TUHH). The presentations are here for MPM and Clay

Hopefully the cooperation with those universities will be successful and we will get some grants together in the future!

Dragan Grgic public lecture at Aalto, 8th April 2019

Microstructural characterization and numerical evaluation of the effective elastic properties of oolitic rocks

Aalto University has had the pleasure to host a public lecture of Professor Dragan Grgic (GeoRessources Laboratory, Université de Lorraine). Professor Grgic visited Finland due to cooperation with VTT and GTK. During the visit, he kindly agreed to held a lecture at Aalto.

Professor Grgic presentation can be downloaded here.

Conferences, conferences…

Last several months have been really busy, with me having really no time to catch my breath (but well, we have now 5 journal papers under review, keep fingers crossed). Recently, SeyedMohammadJavad Seyedan presented in the beautiful city of Porto in the NUMGE 2018 conference. He was explaining how to enrich the constitutive model for soil with capability to model the small strain shear nonlinearity. It is a neat expansion, which has also thermodynamical consistency (note: full paper under review)…   Then, Dr Ayman Abed presented on chemical coupling (download paper) in UNSAT Conference in Hong Kong. That is a nice effort with cooperation from UPC BarcelonaTech. Finally, I have been presenting in Vienna Dr Yang Xiujuan paper on water retention behaviour of MX-80 bentonite, when partially saturated with saline solution, as unfortunately Xiujuan could not come to Vienna.

Hong Kong – photo from the conference dinner (yay, my new camera)

Presentations in Milan 12-13 Sep 2017 (seminar and keynote)

Hey,

Today in the beautiful city of Milan, I had a seminar at the Politecnico di Milano on the bentonite behaviour modelling, related to THEBES project. The slides are here. Also, the keynote lecture in the IV ECCOMAS YOUNG INVESTIGATOR CONFERENCE – YIC2017 entitled “MPM or FEM / PFEM / SPH /… Insights on the Material Point Method future” is here. In case you need more information or the movies (sorry, no movies in the .pdf), please do not hesitate to contact me! We are always happy to share!

Enjoy!

Wojtek’s research blog – disclaimer

This site is independent from the Aalto University organisation and as such all the materials here are not necessarily supporting Aalto University views and policies. Even though the majority of the posts here are strictly related to my work and as such may link to the Aalto resources, the site may also provide my own opinion and views – those are my own views and not necessarily the Aalto University views. The posts here are also not pre-approved by the Aalto University communication team.

The other reason why the site is made separately from Aalto University is due to the lack of stability in the Aalto ecosystem. Many of the research pages I created when I came to Aalto have been deleted due to the department restructuring and merging. Unfortunately, I have not been given space to migrate them within the new Civil Engineering Department website. It seems that the best way to avoid such an experience in the future is to have a site which is not connected to the Aalto infrastructure and outside of the Aalto decision making system.