We have now published a detailed description of how Material Point Method, Generalized Material Point Method and Granular Material Point Method work in Uintah. The new paper by Koochi and co-authors focuses on the Granular Material Point Method – which implementation we fully reworked from our previous attempt, yet the paper is invaluable to anyone who wants to understand in-depth how the Material Point Method is implemented in Uintah software.
Also, Granular Material Point Method is becoming ready for wider use – so in case you would like to jump in, learn Uintah and use Granular Material Point Method, contact me at my Aalto email – we are happy to cooperate and help!
I am very happy that we have now published a new paper in Ocean Engineering, about improved prediction of soil properties based on free-fall cone penetrometer data. We managed to go all the way from the experimental data to numerical simulations to a simple design method improvement. Congratulations to Debasis and the whole team who helped with the paper!
The paper can be found here for some time. After the link expires, you can find a late draft version at research.aalto.fi
Furthermore, the Geomeasure research was presented during seminars at Chalmers University of Technology, in Gothenburg, Sweden and at Politecnico di Milano, Milan, Italy. The presentation is here.
I am also pleased to share our presentation from Geomeasure seminar on the 16th of December:
Figure 2. Cracking of a plate with large deformations and no initial crack
The large displacements, inherent to MPM are fully supported, as well as all the explicit MPM algorithms. The paper focuses on the CPDI version of MPM, but the algorithm can be implemented in any mainstream MPM algorithm. The proposed algorithm is also very efficient, reducing the amount of calculations when compared to the original CRAMP very considerably, due to reducing the required number of background grids. Hence, simulations with many cracks are actually doable in reasonable time!
Tito Adibaskoro, Stéphane Bordas, Wojciech T. Sołowski, Simo Hostikka, Multiple discrete crack initiation and propagation in Material Point Method, Engineering Fracture Mechanics, Volume 301, 2024, 109918, ISSN 0013-7944, https://doi.org/10.1016/j.engfracmech.2024.109918.
We got the paper accepted that extends the Granular Material Point Method into unsaturated soil regime. Please have a look here. This is the final paper of Seyedan doctoral thesis. Seyedan has graduated with doctoral degree from Aalto few months ago. Congratulations!
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!
Academy of Finland has awarded Aalto & Geological Survey Finland consortium financing for the Geomeasure project. We will investigate the Finnish seabed with GTK research vessel Geomari and find new ways to interpret the results of the tests, in particular free fall penetrometer tests. To do that, we will take samples from the seabed and correlate results of experimental testing with the penetrometer data. Also, the tests will be numerically modelled with MPM. We also plan to investigate the behaviour of the deposits under cyclic loading, typical for wind turbines.
The logos of Academy of Finland, Aalto University and Geological Survey Finland are owned and copyrighted by the Academy of Finland, Aalto University and Geological Survey Finland, respectively, and used here just for informational purposes only.
Our review paper on Material Point Method is now available here. The link will expire in a month, but I hope that by that time we will be able to provide a copy that could be used instead.
Please have a look, and let me thank all the co-authors: professors Martin Berzins, Will Coombs, Jim Guilkey, Matthias Möller and Kenichi Soga, as well as the doctoral students (some of whom graduated by now): , Tito Adibaskoro, Seyedmohammadjavad Seyedan, Roel Tielen and Quoc Anh Tran (all the names in alphabetical order). Thank you again!
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 🙂
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!
The E-Unsat 2020 has been excellently organised and a resound success, despite being fully online. Even though I must say I did miss the chats with friends and informal, but often illuminating discussions with the attendees, I still have seen many great presentations and learnt much.
Silo filling comparison, CPDI vs Granular CPDI. Simulation done by inserting points on top, and letting them settle under gravity. Lines denotes the domain of the material points, with significant deformations and lack of density recovery in CPDI simulation, while with granular extension the particles settle down at much more realistic density. We used Mohr-Coulomb model for the simulation, (c) Seyedan & Sołowski
I was also presenting the paper authored by Dr Abed and me on validation of gas transport couplings in our THMC coupled Finite Element Method code Thebes (presentation here, and paper here). We have much more to do in relation to gas transport – my doctoral student Abhishek Gupta is responsible for that, and we hope to deliver ambitious simulations of gas transport of a generic nuclear waste repository in a year or two.
I was delighted to deliver the Young Invited Lecture on Granular Material Point Method, something we are working on with Seyed Mohammad Javad Seyedan. We will aim to publish full paper based on the presentation, but for now, the presentation is here.
Many more exciting things has happened and is happening with the research in my group – I will try to update you on that soon!
