{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T06:47:30Z","timestamp":1776840450115,"version":"3.51.2"},"reference-count":45,"publisher":"American Mathematical Society (AMS)","issue":"356","license":[{"start":{"date-parts":[[2025,11,4]],"date-time":"2025-11-04T00:00:00Z","timestamp":1762214400000},"content-version":"am","delay-in-days":365,"URL":"https:\/\/www.ams.org\/publications\/copyright-and-permissions"}],"funder":[{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["2041884"],"award-info":[{"award-number":["2041884"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Math. Comp."],"abstract":"<p>This paper is concerned with the numerical solution of the flow problem in a fractured porous medium where the fracture is treated as a lower dimensional object embedded in the rock matrix. We consider a space-time mixed variational formulation of such a reduced fracture model with mixed finite element approximations in space and discontinuous Galerkin discretization in time. Different spatial and temporal grids are used in the subdomains and in the fracture to adapt to the heterogeneity of the problem. Analysis of the numerical scheme, including well-posedness of the discrete problem, stability and a priori error estimates, is presented. Using substructuring techniques, the coupled subdomain and fracture system is reduced to a space-time interface problem which is solved iteratively by GMRES. Each GMRES iteration involves solution of time-dependent problems in the subdomains using the method of lines with local spatial and temporal discretizations. The convergence of GMRES is proved by using the field-of-values analysis and the properties of the discrete space-time interface operator. Numerical experiments are carried out to illustrate the performance of the proposed iterative algorithm and the accuracy of the numerical solution.<\/p>","DOI":"10.1090\/mcom\/4031","type":"journal-article","created":{"date-parts":[[2024,10,9]],"date-time":"2024-10-09T09:38:05Z","timestamp":1728466685000},"page":"2645-2684","source":"Crossref","is-referenced-by-count":0,"title":["A space-time mixed finite element method for reduced fracture flow models on nonmatching grids"],"prefix":"10.1090","volume":"94","author":[{"given":"Thi-Thao-Phuong","family":"Hoang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ivan","family":"Yotov","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"14","published-online":{"date-parts":[[2024,11,4]]},"reference":[{"key":"1","doi-asserted-by":"publisher","first-page":"49","DOI":"10.1016\/j.matcom.2016.10.005","article-title":"A reduced fracture model for two-phase flow with different rock types","volume":"137","author":"Ahmed, Elyes","year":"2017","journal-title":"Math. 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