We compare the performance of two numerical approaches to simulate pore-scale flow in randomly generated porous media under fully saturated conditions. The governing system of flow equations is solved via a Body-Fitted (BF) meshing approach and an Immersed Boundary (IB) method, respectively embedded in the ANSYS FLUENT (ANSYS FLUENT, 2009) and EULAG (Prusa et al., 2008) software environments. Mesh resolution dependence is tested for the BF method upon comparing simulations at three different levels of resolution with ANSYS FLUENT. A preliminary sensitivity analysis is performed with EULAG to identify the proper parameter setting for the IB implementation. The results of the two methods are then compared in terms of pore-scale flow fields (Eulerian velocity distributions) and macroscopic quantities (mean Darcy flux and permeability estimates) as well as mass-conservation capability

A comparison of body-fitted and immersed boundary methods for pore-scale modeling of fully saturated flow in synthetic porous media

SIENA, MARTINA;GUADAGNINI, ALBERTO;RIVA, MONICA;INZOLI, FABIO;GUEDON, GAEL RAYMOND;COLOMBO, EMANUELA
2013

Abstract

We compare the performance of two numerical approaches to simulate pore-scale flow in randomly generated porous media under fully saturated conditions. The governing system of flow equations is solved via a Body-Fitted (BF) meshing approach and an Immersed Boundary (IB) method, respectively embedded in the ANSYS FLUENT (ANSYS FLUENT, 2009) and EULAG (Prusa et al., 2008) software environments. Mesh resolution dependence is tested for the BF method upon comparing simulations at three different levels of resolution with ANSYS FLUENT. A preliminary sensitivity analysis is performed with EULAG to identify the proper parameter setting for the IB implementation. The results of the two methods are then compared in terms of pore-scale flow fields (Eulerian velocity distributions) and macroscopic quantities (mean Darcy flux and permeability estimates) as well as mass-conservation capability
IAHR International Groundwater Symposium - Modeling and Management under Uncertainty (proceedings su CD-ROM)
9781138000124
File in questo prodotto:
File Dimensione Formato  
(2013) Siena et al (IAHR).pdf

Accesso riservato

: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 453.99 kB
Formato Adobe PDF
453.99 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/694300
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 0
social impact