Accuracy of fully coupled and sequential approaches for modeling hydro- and geomechanical processes

摘要: Subsurface flow and geomechanics are often modeled with sequential approaches. This can be computationally beneficial compared fully coupled schemes, while it requires usually compromises in numerical accuracy, at least when the scheme is non-iterative. We discuss influence of choice on accuracy expected computational effort based a comparison scheme, employing one-way coupling, an iterative using fixed-stress split for two subsurface injection scenarios. All these schemes were implemented simulator DuMux. study identifies conditions problem settings where differences due to model approach as important geologic features. It shown that particular transient multiphase flow, effects causing significant deviations between non-iterative which might same order magnitude uncertainty. An iterated has but only certain number iterations use up advantage solving smaller systems equations rather than big monolithical one.