Our manuscript (co-authored by former student Zhijun Cai and postdoc scholar Dr. Jinhyun Choo) has been accepted by International Journal of Numerical Method in Engineering (see PDF). The abstract is listed below:

Mixed Arlequin method for multiscale poromechanics problems
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An Arlequin poromechanics model is introduced to simulate the hydro-mechanical coupling effects of fluid-infiltrated porous media across different spatial scales within a concurrent computational framework. A two-field poromechanics problem is first recast as the two-fold saddle point of an incremental energy functional. We then introduce Lagrange multipliers and compatibility energy functionals to enforce the weak compatibility of hydro-mechanical responses in the overlapped domain. To examine the numerical stability of this hydro-mechanical Arlequin model, we derive a necessary condition for stability, the two-fold inf--sup condition for multi-field problems, and establish a modified inf--sup test formulated in the product space of the solution field. We verify the implementation of the Arlequin poromechanics model through benchmark problems covering the entire range of drainage conditions. Through these numerical examples, we demonstrate the performance, robustness, and numerical stability of the Arlequin poromechanics model.

A special issue on computational poromechanics edited by Dr. Sun has been published in International Journal for Multiscale Computational Engineering. Detailed information can be found at 

http://www.dl.begellhouse.com/journals/61fd1b191cf7e96f,2b8c00292c2d9c29.html

The table of content is listed below. 

Table of Contents:
PREFACE: COMPUTATIONAL POROMECHANICS 
WaiChing Sun 
pages v-vi 
DOI: 10.1615/IntJMultCompEng.2016018596

GENERAL FORMULATION OF A POROMECHANICAL COHESIVE SURFACE ELEMENT WITH ELASTOPLASTICITY FOR MODELING INTERFACES IN FLUID-SATURATED GEOMATERIALS 
Richard A. Regueiro, Zheng Duan, Wei Wang, John D. Sweetser, Erik W. Jensen 
pages 323-347 
DOI: 10.1615/IntJMultCompEng.2016018962

SIMULATING FRAGMENTATION AND FLUID-INDUCED FRACTURE IN DISORDERED MEDIA USING RANDOM FINITE-ELEMENT MESHES 
Joseph E. Bishop, Mario J. Martinez, Pania Newell 
pages 349-366 
DOI: 10.1615/IntJMultCompEng.2016016908

MULTISCALE MODEL FOR DAMAGE-FLUID FLOW IN FRACTURED POROUS MEDIA 
Richard Wan, Mahdad Eghbalian 
pages 367-387 
DOI: 10.1615/IntJMultCompEng.2016016951

IDENTIFYING MATERIAL PARAMETERS FOR A MICRO-POLAR PLASTICITY MODEL VIA X-RAY MICRO-COMPUTED TOMOGRAPHIC (CT) IMAGES: LESSONS LEARNED FROM THE CURVE-FITTING EXERCISES 
Kun Wang, WaiChing Sun, Simon Salager, SeonHong Na, Ghonwa Khaddour 
pages 389-413 
DOI: 10.1615/IntJMultCompEng.2016016841

ALBANY: USING COMPONENT-BASED DESIGN TO DEVELOP A FLEXIBLE, GENERIC MULTIPHYSICS ANALYSIS CODE 
Andrew G. Salinger, Roscoe A. Bartlett, Andrew M. Bradley, Qiushi Chen, Irina P. Demeshko, Xujiao Gao, Glen A. Hansen, Alejandro Mota, Richard P. Muller, Erik Nielsen, Jakob T. Ostien, Roger P. Pawlowski, Mauro Perego, Eric T. Phipps, WaiChing Sun, Irina K. Tezaur 
pages 415-438 
DOI: 10.1615/IntJMultCompEng.2016017040