Sun Research Group at Columbia University
  • Home
  • PI
  • Team Members
  • Publications
  • Research
  • Teaching
  • Software & Data
  • Presentations
  • Recruitment & Advice
  • ML for Mechanics
  • Home
  • PI
  • Team Members
  • Publications
  • Research
  • Teaching
  • Software & Data
  • Presentations
  • Recruitment & Advice
  • ML for Mechanics

EMI Vanderbilt 2016 Mini-symposium "Computational Mechanics

8/31/2015

0 Comments

 
URL:  http://www.vanderbilt.edu/emipmc2016/EMI.mini-symposia.php


EMI-MS-16: Computational Geomechanics

Steve WaiChing Sun, Qiushi Chen, Xiaoyu Song, Joshua White, Richard Regueiro, Jose Andrade, Majid Manzari, Ronaldo Borja

Geomaterials, such as soil, rock and concrete, are multiphase porous materials whose macroscopic mechanical behavior is governed by grain size distribution and mineralogy, fluid-saturation, pore space, temperature, loading paths and rate, drainage conditions, chemical reactions, and other factors. As a result, predicting the mechanical response of geomaterials often requires knowledge on how several processes, which often take place in different spatial and temporal domains, interact with each other across length scales.

This mini-symposium is intended to provide a forum for researchers to present contributions on recent advances in Computational Geomechanics. Topics within the scope of interests include, but are not limited to, the following: (1) development and validation of constitutive models that address multi-physical coupling effects, (2) discrete and continuum formulations for geomechanics problems, (3) iterative sequential couplings of fluid and solid solvers, (4) uncertainty quantification for geomechanics problems, (5) multiscale mechanics, (6) modeling of weak and strong discontinuities, (7) regularization techniques to circumvent pathological mesh dependence, and (8) techniques to model crack growth and fragmentation processes in geomaterials.

0 Comments

Presentation at Technische Universität Dresden, Germany

8/21/2015

0 Comments

 
Vortragsankündigung: Im Rahmen der Forschergruppe FOR 2089 ist Prof. WaiChing Sun 
als Gast am Institut für Statik und Dynamik der Tragwerke und wird über seine Arbeiten be-
richten 

Datum: 27.08.2015 
Raum: Bey 67 
Zeit: 14:00 Uhr 

Multiscale coupling method for fluid-infiltrating porous media at the finite deformation range 

Department of Civil Engineering and Engineering Mechanics, 
Fu Foundation School of Engineering and Applied Science, 
Columbia University, New York 

Email: [email protected]

The mechanical behavior of a fluid-infiltrating porous solid is significantly influenced by the presence and diffusion of the pore fluid in the void. This hydro-mechanical coupling effect can be observed in a wide range of materials, including rocks, soils, concretes, bones and soft tissues. Due to the high computational demand, explicitly simulating the pore-scale solid-fluid interactions remains impractical for engineering problems commonly encountered in the field and basin scales. The objective of this talk is to present classes of multiscale technologies that couple hydro-mechanical simulations across different spatial and temporal scales. The first class of model is a concurrent coupling model in which deformation-diffusion problems are re-casted as a two-fold saddle point problem that optimizes the constrained partitioned incremental work of a multi-field energy functional. By enforcing compatibility across length scales, pore-scale simulations in confined domain can be coupled with large-scale field problems while maintaining numerical stability and accuracy. The combined usage of temporal operator split and Arlequin model to resolve highly refined details of space-time porous continuum will be discussed. The second class of multiscale model is a nonlocal hierarchical multiscale framework that couples grain-scale network-DEM simulations with a macroscopic hydro-mechanical mixed finite element model. This hierarchical nonlocal DEM-mixed-FEM coupling retains the simplicity and efficiency of the continuum-based finite element model, while possessing the original length scale of the granular system. Techniques for two-scale material identification with inverse problems will be discussed. The pros and cons of these different multiscale-coupling strategies will be demonstrated in numerical examples.
0 Comments

Yang Liu successfully defends her thesis

8/16/2015

0 Comments

 
PictureDr. Yang Liu
PhD Candidate Yang Liu successfully defend her thesis on multiscale modeling of granular materials. 

Congratulations Dr. Liu! 

0 Comments

NSF Grant Proposal funded: A Phase Field Arlequin Model for Resolving Nonlocal Hydromechanical Effects of Porous Media Across Time and Spatial Scales

8/9/2015

0 Comments

 
The proposal #1462760 "A Phase Field Arlequin Model for Resolving Nonlocal Hydromechanical Effects of Porous Media Across Time and Spatial Scales" submitted to Mechanics of Material program of NSF has been awarded at the level of $300,000. The funding will support research and educational activities for a new type of computational poromechanics model that enables modeling of multi-physical events at different spatial and temporal scales. 

In additional to this single-PI proposal, the research group has also received support NSF from NSF proposal #1520732 and #1516300 in which Prof. Sun served as co-PI. 


0 Comments

Seminars at Sandia and Los Alamos National LAboratories on Monday and Wednesday 

8/9/2015

0 Comments

 
Two multiscale discrete-continuum models for predicting fluid-saturated geomaterials from grain- to field-scales

Prof. Steve Waiching Sun

Department of Civil Engineering and Engineering Mechanics
Columbia University, New York

Monday, August 10, 2015
2:00 PM – 3:00 PM
Building 823 Room 2279

The mechanical behavior of a fluid-infiltrating porous solid is significantly influenced by the presence and diffusion of the pore fluid in the void. This hydro-mechanical coupling effect can be observed in a wide range of materials, including rocks, soils, concretes, bones and soft tissues. Due to the high computational demand, explicitly simulating the pore scale solid-fluid interactions remains impractical for engineering problems commonly encountered in the field and basin scales. The objective of this talk is to present two classes of multiscale technologies that couple across different spatial and temporal scales.

The first class of model is a concurrent coupling model in which deformation-diffusion problems are casted as the two-fold saddle point that optimizes the constrained partitioned incremental work of a multi-field energy functional. By enforcing compatibility across length scales, pore-scale simulations in confined domain can be coupled with large-scale field problems while maintaining numerical stability and accuracy. The combined usage of temporal operator split and Arlequin model to resolve highly refined details of space-time porous continuum will be discussed.

The second class of multiscale model is a nonlocal hierarchical multiscale framework that couples grain-scale discrete element simulations with a hydromechanical mixed finite element model. This hierarchical nonlocal DEM-mixed-FEM coupling retains the simplicity and efficiency of the continuum-based finite element model, while possessing the original length scale of the granular system. Techniques for two-scale material identification with Dakota will be discussed. The pros and cons of these two different coupling strategies will be demonstrated in numerical examples.

0 Comments

    Group News

    News about Computational Poromechanics lab at Columbia University.

    Categories

    All
    Invited Talk
    Job Placements
    Journal Article
    Presentation
    Special Events

    Archives

    July 2023
    June 2023
    May 2023
    March 2023
    December 2022
    November 2022
    August 2022
    July 2022
    May 2022
    April 2022
    March 2022
    December 2021
    November 2021
    October 2021
    September 2021
    August 2021
    July 2021
    June 2021
    May 2021
    April 2021
    March 2021
    February 2021
    January 2021
    October 2020
    August 2020
    July 2020
    June 2020
    May 2020
    February 2020
    January 2020
    December 2019
    September 2019
    July 2019
    June 2019
    May 2019
    April 2019
    March 2019
    February 2019
    December 2018
    October 2018
    September 2018
    August 2018
    July 2018
    June 2018
    May 2018
    April 2018
    March 2018
    January 2018
    December 2017
    November 2017
    October 2017
    September 2017
    August 2017
    July 2017
    June 2017
    May 2017
    April 2017
    March 2017
    February 2017
    January 2017
    December 2016
    November 2016
    October 2016
    May 2016
    April 2016
    March 2016
    February 2016
    January 2016
    November 2015
    October 2015
    September 2015
    August 2015
    July 2015
    June 2015
    May 2015
    March 2015
    February 2015
    January 2015
    December 2014
    November 2014
    October 2014
    September 2014
    August 2014
    July 2014
    June 2014
    May 2014
    April 2014
    March 2014
    February 2014
    January 2014
    November 2013
    September 2013

    RSS Feed

Contact Information
Prof. Steve Sun
Phone: 212-851-4371 
Fax: +1 212-854-6267
Email: [email protected]
Copyright @ 2014-2025.  All rights reserved.