10,225 research outputs found
A General Spatio-Temporal Clustering-Based Non-local Formulation for Multiscale Modeling of Compartmentalized Reservoirs
Representing the reservoir as a network of discrete compartments with
neighbor and non-neighbor connections is a fast, yet accurate method for
analyzing oil and gas reservoirs. Automatic and rapid detection of coarse-scale
compartments with distinct static and dynamic properties is an integral part of
such high-level reservoir analysis. In this work, we present a hybrid framework
specific to reservoir analysis for an automatic detection of clusters in space
using spatial and temporal field data, coupled with a physics-based multiscale
modeling approach. In this work a novel hybrid approach is presented in which
we couple a physics-based non-local modeling framework with data-driven
clustering techniques to provide a fast and accurate multiscale modeling of
compartmentalized reservoirs. This research also adds to the literature by
presenting a comprehensive work on spatio-temporal clustering for reservoir
studies applications that well considers the clustering complexities, the
intrinsic sparse and noisy nature of the data, and the interpretability of the
outcome.
Keywords: Artificial Intelligence; Machine Learning; Spatio-Temporal
Clustering; Physics-Based Data-Driven Formulation; Multiscale Modelin
Coupling atomistic and continuum hydrodynamics through a mesoscopic model: application to liquid water
We have conducted a triple-scale simulation of liquid water by concurrently
coupling atomistic, mesoscopic, and continuum models of the liquid. The
presented triple-scale hydrodynamic solver for molecular liquids enables the
insertion of large molecules into the atomistic domain through a mesoscopic
region. We show that the triple-scale scheme is robust against the details of
the mesoscopic model owing to the conservation of linear momentum by the
adaptive resolution forces. Our multiscale approach is designed for molecular
simulations of open domains with relatively large molecules, either in the
grand canonical ensemble or under non-equilibrium conditions.Comment: triple-scale simulation, molecular dynamics, continuum, wate
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Advances and Challenges in Computational Research of Micro and Nano Flows
This paper was presented at the 4th Micro and Nano Flows Conference (MNF2014), which was held at University College, London, UK. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute, ASME Press, LCN London Centre for Nanotechnology, UCL University College London, UCL Engineering, the International NanoScience Community, www.nanopaprika.eu.This paper presents a collective overview of recent studies regarding the computational modelling
of micro- and nano-fluidic systems. The review provides an introduction to atomistic, mesoscale and hybrid
methods for simulating micro and nano-flows, as well as discusses recent applications and results from the
application of such methods
A Laplacian-based algorithm for non-isothermal atomistic-continuum hybrid simulation of micro and nano-flows
We propose a new hybrid algorithm for incompressible micro and nanoflows that applies to non-isothermal steady-state flows and does not require the calculation of the Irving–Kirkwood stress tensor or heat flux vector. The method is validated by simulating the flow in a channel under the effect of a gravity-like force with bounding walls at two different temperatures and velocities. The model shows very accurate results compared to benchmark full MD simulations. In the temperature results, in particular, the contribution of viscous dissipation is correctly evaluated
Coupling different levels of resolution in molecular simulations
Simulation schemes that allow to change molecular representation in a
subvolume of the simulation box while preserving the equilibrium with the
surrounding introduce conceptual problems of thermodynamic consistency. In this
work we present a general scheme based on thermodynamic arguments which ensures
thermodynamic equilibrium among the molecules of different representation. The
robustness of the algorithm is tested for two examples, namely an adaptive
resolution simulation, atomistic/coarse-grained, for a liquid of tetrahedral
molecules and an adaptive resolution simulation of a binary mixture of
tetrahedral molecules and spherical solutes
Multiscale simulations of porous media flows in flow-based coordinate system
In this paper, we propose a multiscale technique for the simulation of porous media flows in a flow-based coordinate system. A flow-based coordinate system allows us to simplify the scale interaction and derive the upscaled equations for purely hyperbolic transport equations. We discuss the applications of the method to two-phase flows in heterogeneous porous media. For two-phase flow simulations, the use of a flow-based coordinate system requires limited global information, such as the solution of single-phase flow. Numerical results show that one can achieve accurate upscaling results using a flow-based coordinate system
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