scholarly journals PorePy: an open-source software for simulation of multiphysics processes in fractured porous media

2020 ◽  
Author(s):  
Eirik Keilegavlen ◽  
Runar Berge ◽  
Alessio Fumagalli ◽  
Michele Starnoni ◽  
Ivar Stefansson ◽  
...  
Keyword(s):  
Porous Media ◽  
Open Source ◽  
Open Source Software ◽  
Fractured Rocks ◽  
Fractured Reservoirs ◽  
Simulation Software ◽  
Coupled Processes ◽  
Fracture Networks ◽  
Flow And Transport ◽  
Multiphysics Problems

Abstract Development of models and dedicated numerical methods for dynamics in fractured rocks is an active research field, with research moving towards increasingly advanced process couplings and complex fracture networks. The inclusion of coupled processes in simulation models is challenged by the high aspect ratio of the fractures, the complex geometry of fracture networks, and the crucial impact of processes that completely change characteristics on the fracture-rock interface. This paper provides a general discussion of design principles for introducing fractures in simulators, and defines a framework for integrated modeling, discretization, and computer implementation. The framework is implemented in the open-source simulation software PorePy, which can serve as a flexible prototyping tool for multiphysics problems in fractured rocks. Based on a representation of the fractures and their intersections as lower-dimensional objects, we discuss data structures for mixed-dimensional grids, formulation of multiphysics problems, and discretizations that utilize existing software. We further present a Python implementation of these concepts in the PorePy open-source software tool, which is aimed at coupled simulation of flow and transport in three-dimensional fractured reservoirs as well as deformation of fractures and the reservoir in general. We present validation by benchmarks for flow, poroelasticity, and fracture deformation in porous media. The flexibility of the framework is then illustrated by simulations of non-linearly coupled flow and transport and of injection-driven deformation of fractures. All results can be reproduced by openly available simulation scripts.

scholarly journals DuMux 3 – an open-source simulator for solving flow and transport problems in porous media with a focus on model coupling

2021 ◽  
Vol 81 ◽  
pp. 423-443 ◽  
Author(s):  
Timo Koch ◽  
Dennis Gläser ◽  
Kilian Weishaupt ◽  
Sina Ackermann ◽  
Martin Beck ◽  
...  
Keyword(s):  
Porous Media ◽  
Open Source ◽  
Model Coupling ◽  
Flow And Transport ◽  
Transport Problems

scholarly journals Problem Based Learning on Cloud Economics Analysis Using Open Source Simulation

2016 ◽  
Vol 12 (06) ◽  
pp. 4 ◽  
Author(s):  
Irfan Syamsuddin
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Data Center ◽  
High Speed ◽  
Energy Savings ◽  
Problem Based Learning ◽  
Simulation Software ◽  
Paper Report ◽  
Actual Case ◽  
Economics Analysis

The paper report the applicablity of open source simulation software called GreenCloud to assist a novel Problem Based Learning in a laboratory environment. The actual case of Indonesia government plan to deploy cloud based data center infrastructure was picked up as the actual case. In such case, cloud economics analysis is required along with technical one. An open source software called GreenCloud is suitebale to perform the simulation and analysis of cloud computing from economics perspective. It was applied into three models of cloud architecture namely Two-Tier, Three-Tier and Three-Tier High Speed and then analyzed in terms of their energy consumptions based on three options of cloud economics scheme, namely i) non energy savings, ii) Dynamics Voltage and Frequency Scaling (DVFS) and iii) Dynamics Shutdown (DNS).

Pressure-Transient Behaviors of Wells in Fractured Reservoirs With Natural- and Hydraulic-Fracture Networks

SPE Journal ◽  
2018 ◽  
Vol 24 (01) ◽  
pp. 375-394 ◽  
Author(s):  
Zhiming Chen ◽  
Xinwei Liao ◽  
Wei Yu ◽  
Kamy Sepehrnoori
Keyword(s):  
Porous Media ◽  
Fractured Reservoirs ◽  
Fractured Porous Media ◽  
Fracture Networks ◽  
Computationally Efficient ◽  
Efficient Manner ◽  
Complex Fracture ◽  
Mesh Free ◽  
Petroleum Resources ◽  
Fluid Production

Summary Fracture networks are extremely important for the management of groundwater, carbon sequestration, and petroleum resources in fractured reservoirs. Numerous efforts have been made to investigate transient behaviors with fracture networks. Unfortunately, because of the complexity and the arbitrary nature of fracture networks, it is still a challenge to study transient behaviors in a computationally efficient manner. In this work, we present a mesh-free approach to investigate transient behaviors in fractured media with complex fracture networks. Contributions of properties and geometries of fracture networks to the transient behaviors were systematically analyzed. The major findings are noted: There are approximately eight transient behaviors in fractured porous media with complex fracture networks. Each behavior has its own special features, which can be used to estimate the fluid front and quantify fracture properties. Geometries of fracture networks have important impacts on the occurrence and the duration of some transient behaviors, which provide a tool to identify the fracture geometries. The fluid production in the fractured porous media is improved with high-conductivity (denser, larger) and high-complexity fracture networks.

scholarly journals Open-Source Software for Electromagnetic Scattering Simulation: The Case of Antenna Design

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1506 ◽  
Author(s):  
Alessandro Fedeli ◽  
Claudio Montecucco ◽  
Gian Luigi Gragnani
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Electromagnetic Scattering ◽  
Simulation Software ◽  
Antenna Design ◽  
Electromagnetic Simulation ◽  
Academic World ◽  
Introductory Overview ◽  
Commercial Program

Electromagnetic scattering simulation is an extremely wide and interesting field, and its continuous evolution is associated with the development of computing resources. Undeniably, antenna design at all levels strongly relies on electromagnetic simulation software. However, despite the large number and the high quality of the available open-source simulation packages, most companies have no doubts about the choice of commercial program suites. At the same time, in the academic world, it is frequent to develop in-house simulation software, even from scratch and without proper knowledge of the existing possibilities. The rationale of the present paper is to review, from a practical viewpoint, the open-source software that can be useful in the antenna design process. To this end, an introductory overview of the usual design workflow is firstly presented. Subsequently, the strengths and weaknesses of open-source software compared to its commercial counterpart are analyzed. After that, the main open-source packages that are currently available online are briefly described. The last part of this paper is devoted to a preliminary numerical benchmark for the assessment of the capabilities and limitations of a subset of the presented open-source programs. The benchmark includes the calculation of some fundamental antenna parameters for four different typologies of radiating elements.

GIS-Based Noise Simulation Open Source Software: N-GNOIS

2014 ◽  
Vol 14 (01) ◽  
pp. 1550005 ◽  
Author(s):  
Ritesh Vijay ◽  
A. Sharma ◽  
M. Kumar ◽  
V. Shende ◽  
T. Chakrabarti ◽  
...  
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Simulation Software ◽  
Geographical Information ◽  
Noise Component ◽  
Cumulative Impact ◽  
Mobile Sources ◽  
Noise Simulation ◽  
User Friendly ◽  
The Impact

Geographical information system (GIS)-based noise simulation software (N-GNOIS) has been developed to simulate the noise scenario due to point and mobile sources considering the impact of geographical features and meteorological parameters. These have been addressed in the software through attenuation modules of atmosphere, vegetation and barrier. N-GNOIS is a user friendly, platform-independent and open geospatial consortia (OGC) compliant software. It has been developed using open source technology (QGIS) and open source language (Python). N-GNOIS has unique features like cumulative impact of point and mobile sources, building structure and honking due to traffic. Honking is the most common phenomenon in developing countries and is frequently observed on any type of roads. N-GNOIS also helps in designing physical barrier and vegetation cover to check the propagation of noise and acts as a decision making tool for planning and management of noise component in environmental impact assessment (EIA) studies.

Modified Extended Finite Element Methods for Gas Flow in Fractured Reservoirs: A Pseudo-Pressure Approach

2018 ◽  
Vol 140 (7) ◽  
Author(s):  
Youshi Jiang ◽  
Arash Dahi-Taleghani
Keyword(s):  
Finite Element ◽  
Porous Media ◽  
Fluid Flow ◽  
Gas Flow ◽  
Fractured Reservoirs ◽  
Tight Gas ◽  
Fracture Networks ◽  
Extended Finite Element ◽  
Gas Reservoirs ◽  
Complex Fracture

Fluid flow in fractured porous media has always been important in different engineering applications especially in hydrology and reservoir engineering. However, by the onset of the hydraulic fracturing revolution, massive fracturing jobs have been implemented in unconventional hydrocarbon resources such as tight gas and shale gas reservoirs that make understanding fluid flow in fractured media more significant. Considering ultralow permeability of these reservoirs, induced complex fracture networks play a significant role in economic production of these resources. Hence, having a robust and fast numerical technique to evaluate flow through complex fracture networks can play a crucial role in the progress of inversion methods to determine fracture geometries in the subsurface. Current methods for tight gas flow in fractured reservoirs, despite their advantages, still have several shortcomings that make their application for real field problems limited. For instance, the dual permeability theory assumes an ideal uniform orthogonal distribution of fractures, which is quite different from field observation; on the other hand, numerical methods like discrete fracture network (DFN) models can portray the irregular distribution of fractures, but requires massive mesh refinements to have the fractures aligned with the grid/element edges, which can greatly increase the computational cost and simulation time. This paper combines the extended finite element methods (XFEM) and the gas pseudo-pressure to simulate gas flow in fractured tight gas reservoirs by incorporating the strong-discontinuity enrichment scheme to capture the weak-discontinuity feature induced by highly permeable fractures. Utilizing pseudo-pressure formulations simplifies the governing equations and reduces the nonlinearity of the problem significantly. This technique can consider multiple fracture sets and their intersection to mimic real fracture networks on a plain structured mesh. Here, we utilize the unified Hagen–Poiseuille-type equation to compute the permeability of tight gas, and finally adopt Newton–Raphson iteration method to solve the highly nonlinear equations. Numerical results illustrate that XFEM is considerably effective in fast calculation of gas flow in fractured porous media.

scholarly journals Open Source Software Library for Thermo-Hydro-Mechanical Coupled Processes in Python

2021 ◽  
Vol 1 ◽  
pp. 185-186
Author(s):  
Carsten Rücker
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Site Selection ◽  
Selection Process ◽  
Fluid Motion ◽  
Coupled Processes ◽  
Software Library ◽  
Source Codes ◽  
Scripting Language ◽  
High Level

Abstract. This contributed poster shows the current state of development of a finite element implementation as part of an open source software library (OSSL) for the simulation of thermo-hydro-mechanical (THM) coupled processes. The reliable handling of numerical methods is fundamental for the understanding of scientific interrelationships and thus, a crucial prerequisite for modeling THM scenarios, as well as for the understanding and evaluation of preliminary safety investigations during the site selection process for the storage of high-level radioactive waste. There are several motivations for developing an in-house OSSL, which will allow us to: Build capacity and maintenance within BASE (Federal Office for the Safety of Nuclear Waste Management) regarding issues of the numerical modeling of safety-relevant aspects on the long-term safety analyses specified by the German legislator in the site selection process. Develop a collection of known benchmarks and evaluation examples for the comparison of different software tools, applying a uniform interface to simplify the use of the available highly specialized open source codes. Diversify the testing possibilities regarding the preliminary safety investigations by means of our own, independent modeling software. Document basic THM scenarios for internal or, if necessary, public technical training, e.g., density-driven fluid flow (Fig. 1), convergence in salt, temperature propagation in the repository area, crack development, diffusive or advective mass transport. Ensure transparency and, in principle, might allow for appropriately proven-quality (validated) and documented simulation tools for the public regarding questions about the preliminary safety investigations during the site selection process. The development of the OSSL is mainly based on the scripting language Python, which allows the necessary flexibility for the diverse fields of application and at the same time enables maximum transparency for all aspects of the source code. To ensure the high quality of the software, state of the art development tools are used (e.g., version control, automated tests, and documentation generation). Figure 1 shows our preliminary simulation results of the so-called Elder problem (Elder, 1967), a popular standard benchmark for thermo-hydrogeological coupling in which fluid motion in a porous medium is driven by buoyancy forces.

Impacts of changing conditions on far-field radionuclide evolution: background and goals of a newly funded DFG-RFBR project.

2020 ◽  
Author(s):  
Fabien Magri ◽  
Thomas Nagel ◽  
Axel Liebscher ◽  
Victor Malkovsky
Keyword(s):  
Porous Media ◽  
Groundwater Flow ◽  
Open Source ◽  
Large Scale ◽  
Numerical Models ◽  
Basic Research ◽  
Crystalline Rock ◽  
Coupled Processes ◽  
Far Field ◽  
Long Time

<p>To date, the most secure, technically feasible and internationally accepted solution for the safe management of Radioactive Waste (RW) is burial in deep host rock units, also referred to as disposal in a deep geological repository (DGR). For this purpose, it is mandatory to select a site in a hydrogeological setting which provides sufficiently safe natural conditions for waste isolation from groundwater flow over long time periods (up to 1 Ma).</p><p>However, over such a long time period, external factors (e.g. climate change) and intrinsic basin features (e.g. tectonics), here referred to as changing conditions, will impact the hydrological (H), thermal (T), mechanical (M) and chemical (C) state of the entire system. Therefore, it is crucial to better understand the impacts of changing conditions on far-field radionuclide mobilization and behavior in order to select the most suitable DGR for RW disposal.</p><p>Multiphysics simulators offer powerful tools that couple groundwater flow (H), transport of heat (T), as well as geochemical reactions (C) in a deforming solid framework (M). These coupled THM-C numerical models can provide evaluations for performance and safety assessment of a DGR at different scales. However, a limited number of studies so far addressed the far-field evolution of radionuclides under the changing conditions listed above.</p><p>The newly funded German Science Foundation (DFG) and the Russian Foundation for Basic Research (RFBR) project “INFRA” (NA1528/2-1 and MA4450/5-1; 2020-2022) aims to investigate the impacts of (i) glaciation, (ii) permafrost and (iii) tectonic events on the coupled boundaries that control large-scale groundwater flow near hypothetical waste repositories. For this purpose, the open source simulator OpenGeoSys [1,2] will be applied using available data from selected areas of the Yeniseisky Site in Russia [3].</p><p>Though the context of this study is related to RW issues, the outcomes of INFRA will be of interest for any field of geosciences that deals with large-scale simulations of coupled processes under transient boundary conditions.</p><p> </p><p>[1] Kolditz, O., Bauer, S., Bilke, L., Böttcher, N., Delfs, J. O., Fischer, T., … Zehner, B. (2012). OpenGeoSys: an open-source initiative for numerical simulation of thermo-hydro-mechanical/chemical (THM/C) processes in porous media. Environmental Earth Sciences, 67(2), 589–599. https://doi.org/10.1007/s12665-012-1546-x</p><p>[2] Bilke, L., Flemisch, B., Kalbacher, T., Kolditz, O., Helmig, R., & Nagel, T. (2019). Development of Open-Source Porous Media Simulators: Principles and Experiences. Transport in Porous Media, 130(1), 337–361. https://doi.org/10.1007/s11242-019-01310-1.</p><p>[3] Laverov, N., Yudintsev, S., Kochkin, B., Malkovsky V. (2016). The Russian Strategy of using Crystalline Rock as a Repository for Nuclear Waste. Elements, 12(4), 253–256. https://doi: 10.2113/gselements.12.4.253  </p>

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