Academic Journal
Direct numerical simulation of fully saturated flow in natural porous media at the pore scale: a comparison of three computational systems
| العنوان: | Direct numerical simulation of fully saturated flow in natural porous media at the pore scale: a comparison of three computational systems |
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| المؤلفون: | SIENA, MARTINA, RIVA, MONICA, GUADAGNINI, ALBERTO, INZOLI, FABIO, GUEDON, GAEL RAYMOND, COLOMBO, EMANUELA, Hyman, J. D., Winter, C. L., Smolarkiewicz, P. K., Gouze, P., Sadhukhan, S. |
| المساهمون: | Siena, Martina, Hyman, J. D., Riva, Monica, Guadagnini, Alberto, Winter, C. L., Smolarkiewicz, P. K., Gouze, P., Sadhukhan, S., Inzoli, Fabio, Guedon, GAEL RAYMOND, Colombo, Emanuela |
| سنة النشر: | 2015 |
| المجموعة: | RE.PUBLIC@POLIMI - Research Publications at Politecnico di Milano |
| مصطلحات موضوعية: | Computational model comparison, Eulerian grid-based method, Immersed boundary method, Pore-scale flow simulation, Porous media |
| الوصف: | Direct numerical simulations of flow through two millimeter-scale rock samples of limestone and sandstone are performed using three diverse fluid dynamic simulators. The resulting steady-state velocity fields are compared in terms of the associated empirical probability density functions (PDFs) and key statistics of the velocity fields. The pore space geometry of each sample is imaged at 5.06-mu m voxel size resolution using X-ray microtomography. The samples offer contrasting characteristics in terms of total connected porosity (about 0.31 for the limestone and 0.07 for the sandstone) and are typical of several applications in hydrogeology and petroleum engineering. The three-dimensional fluid velocity fields within the explicit pore spaces are simulated using ANSYSA (R) FLUENTA (R) ANSYS Inc. (2009), EULAG Prusa et al. (Comput. Fluids 37, 1193-1207 2008), and SSTOKES Sarkar et al. (2002). These computational approaches are highly disperse in terms of algorithmic complexity, differ in terms of their governing equations, the adopted numerical methodologies, the enforcement of internal no-slip boundary conditions at the fluid-solid interface, and the computational mesh structure. As metrics of comparison to probe in a statistical sense the internal similarities/differences across sample populations of velocities obtained through the computational systems, we consider (i) integral quantities, such as the Darcy flux and (ii) main statistical moments of local velocity distributions including local correlations between velocity fields. Comparison of simulation results indicates that mutually consistent estimates of the state of flow are obtained in the analyzed samples of natural pore spaces despite the considerable differences associated with the three computational approaches. We note that in the higher porosity limestone sample, the structures of the velocity fields obtained using ANSYS FLUENT and EULAG are more alike than either compared against the results obtained using SSTOKES. In the low-porosity sample, the ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000355335100010; volume:19; issue:2; firstpage:423; lastpage:437; numberofpages:15; journal:COMPUTATIONAL GEOSCIENCES; http://hdl.handle.net/11311/981783; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84930089572; www.baltzer.nl/comgeo/comgeo.asp |
| DOI: | 10.1007/s10596-015-9486-7 |
| الاتاحة: | http://hdl.handle.net/11311/981783 https://doi.org/10.1007/s10596-015-9486-7 |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.2753AD6D |
| قاعدة البيانات: | BASE |
| DOI: | 10.1007/s10596-015-9486-7 |
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