Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1016/j.ijheatmasstransfer.2021.121127
Volltext Autorenversion
Titel (primär) Improved predictions of thermal fluid pressurization in hydro-thermal models based on consistent incorporation of thermo-mechanical effects in anisotropic porous media
Autor Buchwald, J. ORCID logo ; Kaiser, S.; Kolditz, O. ORCID logo ; Nagel, T.
Quelle International Journal of Heat and Mass Transfer
Erscheinungsjahr 2021
Department ENVINF
Band/Volume 172
Seite von art. 121127
Sprache englisch
Topic T5 Future Landscapes
T8 Georesources
Keywords thermo-hydro-mechanical; hydro-thermal; radioactive waste; geological repository; specific storage; model complexity reduction; OpenGeoSys
Abstract Coupled thermo-hydro-mechanical models are commonly used to model the evolution of temperature, pore pressure, and stress in a wide range of geotechnologies such as geothermal applications or around canisters of high-level radioactive waste in deep underground storage facilities. Their numerical modeling is often computationally highly demanding, especially if parameter identification, sensitivity analyses or uncertainty quantification require many model evaluations. Often, the thermally driven pore pressure evolution and the subsequently altered flow processes are the primary targets of an analysis. To benefit from the computational efficiency of hydro-thermal (HT) models while maintaining the accuracy of the thermo-hydro-mechanical (THM) model, we derived two cases of a simplified representation of mechanical deformations in a coupled hydro-thermal model. Deformations induced by pressure as well as temperature changes are consistently incorporated into the mass balance storage terms. We demonstrate the exact coincidence of THM and modified TH formulations in isotropic and orthotropic materials as long as the basic assumptions like constant hydrostatic stress conditions or uniaxial strain hold. By modeling of a point heat source in isotropic or anisotropic porous media it is shown that a good agreement between TH and THM models can be maintained even though the assumptions underlying the simplification are no longer valid exactly. On our test-machine, a significant speed-up could be achieved by the reduction of the problem size when transitioning from a THM to a TH model. The highest speed-ups were achieved when Taylor-Hood elements were employed in order to avoid the problem of spurious pressure oscillations in the fully coupled THM model.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=24379
Buchwald, J., Kaiser, S., Kolditz, O., Nagel, T. (2021):
Improved predictions of thermal fluid pressurization in hydro-thermal models based on consistent incorporation of thermo-mechanical effects in anisotropic porous media
Int. J. Heat Mass Transf. 172 , art. 121127 10.1016/j.ijheatmasstransfer.2021.121127