The paper deals with two-dimensional (2D) numerical modelling of hydro-fracking (hydraulic fracturing) in rocks at the meso-scale. A model was developed to characterize properties fluid-driven fractures by combining discrete element method (DEM) computational fluid dynamics (CFD). mechanical behaviour rock matrix simulated DEM and fracturing flow newly pre-existing CFD. changes void geometry were taken into account. initial 2D simulation tests carried out for a segment under biaxial...

In the paper, a two-dimensional (2D) numerical simulation of small-scale hydraulic fracturing process in rock specimens possessing single injection slot was conducted. A unique DEM/CFD-based pore-scale thermal-hydro-mechanical (THM) model used to simulate two-phase laminar fluid flow (water and gas) with heat transfer non-saturated porous materials low porosity. Using DEM fully coupled CFD (based on network composed channels continuous domain between discrete elements) at mesoscale, series...

Abstract The paper focuses on the effect of gas content in rock macropores a hydraulic fracturing process. process was simulated by combining discrete element method (DEM) with computational fluid dynamics (CFD) under two‐dimensional (2D) isothermal conditions. mechanical behavior matrix DEM, and CFD used for describing laminar two‐phase (liquid gas) flow pre‐existing newly developed fractures. Geometry changes pores fractures were precisely reproduced. Fully coupled hydro‐mechanical...

In this paper, the quasi-static and dynamic behavior of partially fluid-saturated concrete under two-dimensional (2D) uniaxial tension at mesoscale is investigated numerically. It was calculated what effect free pore fluid content (gas water) had on fracture process strength in a regime. An improved pore-scale hydro-mechanical model based DEM/CFD used to simulate fully conditions. The foundation flow idea network channels continuous area between discrete elements. very porous, saturated...

Abstract An isothermal compressible single-phase fluid flow through a non-homogeneous granular body composed of densely packed overlapping spheres imitating rock under high pressure was numerically studied using two different approaches. The first approach called the full 3D CFD model used finite volume method (FVM) to solve Reynolds-averaged Navier–Stokes equations Reynolds stress (BSL) in continuous domain between granulates. verified, based on experimental and numerical results from...

Abstract For fracture propagation, a novel DEM-based pore-scale thermal-hydro-mechanical model of two-phase fluid flow with heat transfer in non-saturated porous materials low porosity was developed. Numerical computations were performed for bonded granular specimens, using DEM fully coupled CFD (based on network) and transfer, which integrated discrete mechanics at the meso-scale. Both (diffusion advection) particles (conduction) involved transfer. The numerical findings...

Abstract Airborne acoustic properties of composite structural insulated panels CSIPs composed fibre-magnesium-cement facesheets and expanded polystyrene core were studied. The sound reduction ratings measured experimentally in an test laboratory two reverberation chambers. numerical finite element (FEM) model available ABAQUS was used verified with experimental results. Steady-state transient FE analyses performed. 2D 3D modelling results compared. Different panel modifications numerically...

Abstract The goal of the research was to demonstrate impact thin porous interfacial transition zones (ITZs) between aggregates and cement matrix on fluid flow in unsaturated concrete caused by hydraulic/capillary pressure. To this impact, a novel coupled approach simulate two‐phase (water moist air) hydraulically capillary‐driven developed. By merging discrete element method (DEM) with computational dynamics (CFD) under isothermal settings, process numerically studied at meso‐scale...

This research addresses the flow characteristics within a porous medium composed of monolayer closely packed spheres, spanning from viscous-dominated to turbulent regimes. In first part this paper, at 30 MPa pressure drop domain are presented. The results averaged across different cross sections between inlet and outlet. second study, simulations conducted with drops, ranging nearly 0 100 MPa. analysis finds distinct patterns provides estimations for permeability inertial term coefficient....

The paper presents the research results of field measurements campaign natural ventilation performance and effectiveness in a residential building. building is located microclimate whose parameters differ significantly relation to representative weather station. measurement system recorded climate physical variables characterizing air flow rooms within 14 days winter season. showed that spite proper design construction system, unfavorable microclimatic conditions differed from predicted ones...