Lectures, seminars and workshops

BROWN BAG SEMINARS
Date Seminar Details

20 OCT

Time: 12:00-13:00

Location: Seminar Room, Enterprise Oil Building, Edinburgh Campus

SpeakerDr Quan Gan, Lecturer (University of Aberdeen)

Presenting: A continuum model for coupled stress, fluid flow, and heat transport in discrete fracture networks

Abstract: A numerical model was developed by coupling stress and fluid flow in a discontinuous fractured mass represented as a continuum by coupling the continuum simulator TF_FLAC3D with cell-by-cell discontinuum laws for deformation and flow. Both equivalent medium crack stiffness and permeability tensor approaches are employed to characterize pre-existing discrete fractures. The advantage of this approach is that it allows the creation of fracture networks within the reservoir without any dependence on fracture geometry or gridding. The model is validated against thermal depletion around a single stressed fracture embedded within an infinite porous medium that cuts multiple grid blocks. Comparison of the evolution of aperture against the results from other simulators confirms the veracity of the incorporated constitutive model, accommodating stress-dependent aperture under different stress states, including normal closure, shear dilation, and for fracture walls out of contact under tensile loading.

24 NOV

Time: 12:00-13:00

Location: Seminar Room, Enterprise Oil Building, Edinburgh Campus

Speaker: Victor Gutierrez

To be confirmed

08 DEC

Time: 12:00-13:00

Location: Seminar Room, Tom Patten, Edinburgh Campus

Speaker: Dr Helen Lewis

To be confirmed

12 DEC

Time: 12:00-13:00

Location: Seminar Room, Enterprise Oil Building, Edinburgh Campus

Speaker: Baixin Chen

Presenting: A Multipseudopotential interaction lattice Boltzmann model for two-phase flow (by Sorush Khajepor and Baixin Chen)

Abstract: Pseudopotential lattice Boltzmann (LB) models have been recognized as efficient numerical tools to simulate complex fluid systems, including those at thermodynamic equilibrium states and with phase transitions. However,when the equation of state (EOS) of real fluids is implemented, the existing pseudopotential LBmodels suffer from thermodynamic inconsistency. This study presents a multipseudopotential interparticle interaction (MPI) scheme, which is fully consistent with thermodynamics and applicable to engineering applications. In this framework, multiple pseudopotentials are employed to represent dominant interaction potentials at different extents of the mean free path of particles. By simulating van der Waals and Carnahan-Starling fluids, it is demonstrated that the MPI scheme can correctly simulate the physical nature of two-phase systems on the lattice including the continuum predictions of liquid-vapor coexistence states and the sound speeds in liquid and vapor phases. It is also shown that the lattice interactions of theMPI scheme represent underlying molecular interactions as they vary in a broad range from strong short-distance repulsions to weak long-distance attractions during phase transitions. Consequently, the MPI is proved to be a reliable LB scheme as it avoids generating unphysical potentials in implementing the EOSs of real fluids and limiting the spurious velocities at the interface of two-phase systems.