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Journal articles on the topic 'Thermo-hydraulic simulations'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Koltzer, Nora, Magdalena Scheck-Wenderoth, Judith Bott, et al. "The Effects of Regional Fluid Flow on Deep Temperatures (Hesse, Germany)." Energies 12, no. 11 (2019): 2081. http://dx.doi.org/10.3390/en12112081.

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A successful utilization of deep geothermal resources requires accurate predictions about the distribution of reservoir temperature as well as of the hydraulic processes exerting a direct influence on the productivity of geothermal reservoirs. The aim of this study was to investigate and quantify the influence that regional thermo-hydraulic processes have on the geothermal configuration of potential reservoirs in the German Federal State of Hesse. Specifically, we have addressed the question of how the regional thermal and hydraulic configuration influence the local hydro-thermal reservoir con

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2

Castanheira, João P., Nicole G. Dias, Rui Melicio, Paulo Gordo, André R. R. Silva, and Roger M. Pereira. "Modelling a Loop Heat Pipe as Heat Switch for Transient Application in Space Systems." Applied Sciences 13, no. 23 (2023): 12547. http://dx.doi.org/10.3390/app132312547.

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Heat switches are devices for controlling heat flow in various applications, such as electronic devices, cryogenic cooling systems, spacecraft, and rockets. These devices require non-linear transient thermal simulations, in which there is a lack of information. In this study, we introduce an innovative 1D thermo-hydraulic lumped parameter model to simulate loop heat pipes as heat switches by regulating the temperature difference between the evaporator and the compensation chamber. The developed thermo-hydraulic model uses the continuity, energy, and momentum equations to represent the behaviou

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3

Afsahnoudeh, Reza, Andreas Wortmeier, Maik Holzmüller, Yi Gong, Werner Homberg, and Eugeny Y. Kenig. "Thermo-Hydraulic Performance of Pillow-Plate Heat Exchangers with Secondary Structuring: A Numerical Analysis." Energies 16, no. 21 (2023): 7284. http://dx.doi.org/10.3390/en16217284.

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Pillow-plate heat exchangers (PPHEs) represent a suitable alternative to conventional shell-and-tube and plate heat exchangers. The inherent waviness of their channels promotes fluid mixing in the boundary layers and facilitates heat transfer. The overall thermo-hydraulic performance of PPHEs can further be enhanced by applying secondary surface structuring, thus increasing their competitiveness against conventional heat exchangers. In this work, various secondary structures applied on the PPHE surface were studied numerically to explore their potential to enhance near-wall mixing. Computation

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4

Zahid, Hamid, Abdullah Mubashar, Muhammad Waqas, Muhammad Siddiqi, Umair Munir, and Syed Naqvi. "Experimental and CFD simulation study of shell and tube heat exchangers with different baffle segment configurations." Thermal Science, no. 00 (2022): 75. http://dx.doi.org/10.2298/tsci220124075z.

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Shell and tube heat exchanger (STHX) is an implement that has tremendous applications in numerous industrial processes and research areas. In this study, the commercial software ANSYS is used for 3-D computational fluid dynamics (CFD) to compare the thermo-hydraulic performance of STHXs with recently developed tri-angular (TRI) baffles, and tri-flower (TF) baffles with conventional segmental (SG) baffles at different flow rates. Simulations have been performed to analyze the heat transfer coefficient, pressure drop, and overall thermo-hydraulic performance among the recently developed TRI-STHX

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5

Zhang, Jiamin, Daniel Dias, Qiujing Pan, Chunjing Ma, and Cristina de Hollanda Cavalcanti Tsuha. "Long-Term Thermo-Hydraulic Numerical Assessment of Thermo-Active Piles—A Case of Tropical Soils." Applied Sciences 12, no. 15 (2022): 7653. http://dx.doi.org/10.3390/app12157653.

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Thermo-active piles are an upcoming technology for the utilization of subsurface geothermal energy in urban areas. This environmentally friendly technology has already been widespread for the heating and cooling of buildings in temperate regions, whereas in tropical regions it is still limited due to their unbalanced energy demands. This paper presents 3D thermo-hydraulic coupled numerical simulations to assess the long-term performance of thermo-active pile systems in tropical environments for different energy demands. The simulations are based on real data (in situ tests and field investigat

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Völzel, Constantin, and Stefan Lechner. "Grid-Coupled Geothermal and Decentralised Heat Supply Systems in a Holistic Open-Source Simulation Model for 5GDHC Networks." Sustainability 16, no. 23 (2024): 10503. https://doi.org/10.3390/su162310503.

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In order to reach climate protection goals at national or international levels, new forms of combined heating and cooling networks with ultra-low network temperatures (5GDHC) are viable alternatives to conventional heating networks. This paper presents a simulation library for 5GDHC networks as sustainable shared energy systems, developed in the object-oriented simulation framework OpenModelica. It comprises sub-models for residential buildings acting as prosumers in the network, with additional roof-mounted thermal systems, dynamic thermo-hydraulic representations of distribution pipes and st

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7

Menapace, Andrea, Walter Boscheri, Marco Baratieri, and Maurizio Righetti. "An efficient numerical scheme for the thermo-hydraulic simulations of thermal grids." International Journal of Heat and Mass Transfer 161 (November 2020): 120304. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.120304.

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Kutiš, Vladimír, Gabriel Gálik, Jauraj Paulech, Justín Murín, and Vladimír Goga. "CFD Analysis of Dry Cask Nuclear Fuel Storage." Strojnícky časopis - Journal of Mechanical Engineering 69, no. 3 (2019): 75–80. http://dx.doi.org/10.2478/scjme-2019-0032.

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AbstractThe article describes the thermo-hydraulic analysis of a dry cask storage building that is used for the storage of depleted nuclear fuel to determine the viability of a buoyancy driven cooling system. The analysis is performed in the form of steady-state CFD simulations. The resulting temperature distributions are them evaluated based on required operation criteria.

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9

Borek, Kinga. "Influence of liquid-nitrogen freezing of gas-bearing shale rocks on their compressive strength." Mineralogia 49, no. 1-4 (2018): 7–16. http://dx.doi.org/10.2478/mipo-2018-0002.

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Abstract Any definable relation between falling temperature and the compressive strength of shale rocks should provide a useful predictive tool aiding optimization of the results of hydraulic fracturing. In this research, an automeasuring hydraulic press, a thermo-camera and the Fluent ANSYS software were used. The results of laboratory simulations, and the effects of experiments conducted on shale rocks to determine permanent changes in compressive strength, are presented. As both frozen rocks and rocks returned to room temperature show diminished compressive strength. It is suggested that pr

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10

Elizarov, I., and T. Licklederer. "ProsNet – a Modelica library for prosumer-based heat networks: description and validation." Journal of Physics: Conference Series 2042, no. 1 (2021): 012031. http://dx.doi.org/10.1088/1742-6596/2042/1/012031.

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Abstract Prosumer-based heat networks are a new concept in district heating systems that uses the ability of prosumers to operate as either producers or consumers. This type of networks allows for utilizing distributed heat generation and renewable energy sources. A broad range of individual operating modes, heat generation technologies, and topologies determine complex thermo-hydraulic behavior of such networks. Simulations help gain insights into their properties. In this paper, a Modelica library ProsNet is presented for such simulations. It is designed to set up models of prosumer-based he

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11

Almachi, Juan Carlos, Víctor Hugo Sánchez-Espinoza, and Uwe Imke. "High-Fidelity Steady-State and Transient Simulations of an MTR Research Reactor Using Serpent2/Subchanflow." Energies 15, no. 4 (2022): 1554. http://dx.doi.org/10.3390/en15041554.

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In order to join efforts to develop high-fidelity multi-physics tools for research reactor analysis, the KIT is conducting studies to modify the coupled multi-physics codes developed for power reactors. The coupled system uses the Monte Carlo Serpent 2 code for neutron analysis and the Subchanflow code for thermo-hydraulic analysis. Serpent treats temperature dependence using the target motion sampling method and Subchanflow was previously extended and validated with experimental data for plate-type reactor analysis. This work present for the first time the steady-state and transient neutron a

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12

Demazière, Christophe, Victor Hugo Sanchez-Espinoza, and Irmela Zentner. "Advanced numerical simulation and modeling for reactor safety – contributions from the CORTEX, McSAFER, and METIS projects." EPJ Nuclear Sciences & Technologies 8 (2022): 29. http://dx.doi.org/10.1051/epjn/2022026.

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This paper gives an account of three projects funded by the European Union that heavily rely on numerical modeling and simulations of nuclear reactors: the CORTEX project (CORe monitoring Techniques and EXperimental validation and demonstration), the McSAFER project (High-Performance Advanced Methods and Experimental Investigations for the Safety Evaluation of Generic Small Modular Reactors), and the METIS project (MEthods and Tools Innovations for Seismic risk assessment). The CORTEX project focuses on neutronic simulations, the McSAFER project considers neutronic, thermal-hydraulic, and ther

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Christophe, Demazière, Hugo Sanchez-Espinoza Victor, and Zentner Irmela. "Advanced numerical simulation and modeling for reactor safety – contributions from the CORTEX, McSAFER, and METIS projects." EPJ Nuclear Sci. Technol 8, Euratom Research and Training in 2022: challenges, achievements and future perspectives (2022): 12. https://doi.org/10.1051/epjn/2022026.

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This paper gives an account of three projects funded by the European Union that heavily rely on numerical modeling and simulations of nuclear reactors: the CORTEX project (CORe monitoring Techniques and EXperimental validation and demonstration), the McSAFER project (High-Performance Advanced Methods and Experimental Investigations for the Safety Evaluation of Generic Small Modular Reactors), and the METIS project (MEthods and Tools Innovations for Seismic risk assessment). The CORTEX project focuses on neutronic simulations, the McSAFER project considers neutronic, thermal-hydraulic, and ther

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14

Sepehrnia, Mojtaba, Hossein Khorasanizadeh, and Mohammad Behshad Shafii. "Effect of transverse and parallel magnetic fields on thermal and thermo-hydraulic performances of ferro-nanofluid flow in trapezoidal microchannel heat sink." International Journal of Numerical Methods for Heat & Fluid Flow 31, no. 7 (2021): 2089–111. http://dx.doi.org/10.1108/hff-12-2019-0907.

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Purpose This paper aims to study the thermal and thermo-hydraulic performances of ferro-nanofluid flow in a three-dimensional trapezoidal microchannel heat sink (TMCHS) under uniform heat flux and magnetic fields. Design/methodology/approach To investigate the effect of direction of Lorentz force the magnetic field has been applied: transversely in the x direction (Case I);transversely in the y direction (Case II); and parallel in the z direction (Case III). The three-dimensional governing equations with the associated boundary conditions for ferro-nanofluid flow and heat transfer have been so

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15

Mai, Yuanqi. "The Effect of Cross-Sectional Shape on the Thermo-Hydraulic Performance of Microchannel Heat Sinks." Applied and Computational Engineering 159, no. 1 (2025): 132–40. https://doi.org/10.54254/2755-2721/2025.23607.

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Microchannel heat sinks are widely used in thermal management systems due to their compact design and efficient heat transfer. To further enhance performance, this study uses numerical simulations to explore the heat transfer characteristics of rectangular, triangular, trapezoidal, and circular microchannels while maintaining equal cross-sectional areas. At Re = 900, the triangular microchannel demonstrates optimal heat transfer performance (HTP) but the weakest hydraulic performance, with a 5.56% reduction in thermal resistance and a 54.45% increase in pumping power compared to the rectangula

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16

Mátl, Jakub, and Filip Fejt. "Use of the thermo-hydraulic system code RELAP5/MOD3.2 to transient analysis events of the VR-1 reactor." Acta Polytechnica 65, no. 2 (2025): 243–51. https://doi.org/10.14311/ap.2025.65.0243.

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The article explores the application of the RELAP5 thermo-hydraulic code for transient simulations on the VR-1 research reactor, focusing on reactor vessel nodalisation and coolant stratification above the core. The study investigates Reactivity-Initiated Accidents (RIAs) at the VR-1 reactor, triggered by various initiating events such as inadvertent control rod withdrawal or experimental channel flooding. By comparing several nodalisation models for protected and unprotected RIAs, the study discusses the impact of the nodalisation approach. Key findings highlight the significant influence of

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17

Zou, Zhongyu, Zhigang Zhu, Qiyong Zhang, and Pengcheng Yang. "Optimization investigation for heat transfer enhancement of fins for plate-fin heat exchangers in cryogenic helium systems." IOP Conference Series: Materials Science and Engineering 1301, no. 1 (2024): 012035. http://dx.doi.org/10.1088/1757-899x/1301/1/012035.

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Abstract In order to further improve heat transfer performance and high compactness of plate-fin heat exchangers (PFHEs) in cryogenic helium systems, a new type of perforated-serrated fins is proposed by combining traditional serrated and perforated fins. In this paper, the flow and heat transfer characteristics of helium in perforated-serrated fins and serrated fins channels at low-temperature are investigated using numerical simulations. The numerical model invokes the properties of low-temperature helium by NIST-Real-Gas-Model. Meanwhile, Colburn factor j, friction factor f and JF factor ar

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18

Raj, Vijilius Helena, S. Vinod Kumar, Mohammed Hussein, Rahul Kadam, Dinesh Kumar Yadav, and Shekhar Sharma. "Enhancement of Thermo-Hydraulic Performance using Water-Based Alumina Nanofluids: A Numerical Investigation." E3S Web of Conferences 507 (2024): 01074. http://dx.doi.org/10.1051/e3sconf/202450701074.

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This study investigates the heat transfer and fluid flow characteristics of pure water passing through a double tube heat exchanger (DTHX). Computational fluid dynamics (CFD) simulations were conducted using ANSYS-FLUENT 22 R1 software. Mathematical models and thermophysical properties of nanofluids and water from existing literature were employed. The comparison focused on pure water and 1% Al2O3/H2O nanofluids. Various operating variables such as Reynolds number and temperature were considered across the inner and outer tubes. The Reynolds number ranged from 2500 to 5500 at 80°C for the inne

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19

Mahmoodpour, Saeed, Mrityunjay Singh, Aysegul Turan, Kristian Bär, and Ingo Sass. "Simulations and global sensitivity analysis of the thermo-hydraulic-mechanical processes in a fractured geothermal reservoir." Energy 247 (May 2022): 123511. http://dx.doi.org/10.1016/j.energy.2022.123511.

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20

Bilodid, Yurii, and Jaakko Leppänen. "EFFECT OF THE UNIFORM FISSION SOURCE METHOD ON LOCAL POWER VARIANCE IN FULL CORE SERPENT CALCULATION." EPJ Web of Conferences 247 (2021): 04024. http://dx.doi.org/10.1051/epjconf/202124704024.

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One of challenges of the Monte Carlo full core simulations is to obtain acceptable statistical variance of local parameters throughout the whole reactor core at a reasonable computation cost. The statistical variance tends to be larger in low-power regions. To tackle this problem, the Uniform-Fission-Site method was implemented in Monte Carlo code MC21 and its effectiveness was demonstrated on NEA Monte Carlo performance benchmark. The very similar method is also implemented in Monte Carlo code Serpent under the name Uniform Fission Source (UFS) method. In this work the effect of UFS method im

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21

Hueckel, Tomasz A. "Water–mineral interaction in hygromechanics of clays exposed to environmental loads: a mixture-theory approach." Canadian Geotechnical Journal 29, no. 6 (1992): 1071–86. http://dx.doi.org/10.1139/t92-124.

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Water–mineral interaction in narrow interstices (<30 Å (1 Å = 0.1 nm)) in dense, saturated clays is discussed in view of recent experimental findings and molecular dynamics simulations. Consequences to the macroscopic behavior are considered. A mixture theory for two interacting constituents is developed. Effects of temperature and chemicals are discussed. A postulate of mass transfer of adsorbed water from solid to fluid fraction caused by thermal or chemical load is then discussed. Theory of plasticity of clays affected by heat or chemicals is developed to deal with the effects of thermal

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22

Andrés, Sandro, David Santillán, Juan Carlos Mosquera, and Luis Cueto-Felgueroso. "Hydraulic Stimulation of Geothermal Reservoirs: Numerical Simulation of Induced Seismicity and Thermal Decline." Water 14, no. 22 (2022): 3697. http://dx.doi.org/10.3390/w14223697.

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Enhanced Geothermal Systems (EGS) can boost sustainable development by providing a green energy supply, although they usually require the hydraulic stimulation of the reservoir to increase fluid flow and energy efficiency due to the low rock permeability at the required depths. The injection of fluids for hydraulic stimulation implies several risks, for instance, induced seismicity. In this work, we perform numerical simulations to evaluate the seismic risk in terms of fault reactivation, earthquake magnitude, and rupture propagation. The computational model includes the fully coupled thermo-h

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23

Friedrich, Pascal, Kirill Kuroptev, Thanh Huynh, and Stefan Niessen. "Stability Analysis and Mitigation of Thermo-Hydraulic Oscillations in Multi-Supplier District Heating Systems." Energies 18, no. 5 (2025): 1126. https://doi.org/10.3390/en18051126.

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In fourth-generation district heating systems (DHSs), the supply temperature of modern heat sources such as heat pumps and waste heat can potentially be reduced by mixing in hot water from combustion-based producers, thereby increasing efficiency and facilitating integration into networks with unrenovated buildings. However, this approach introduces the risk of thermo-hydraulic oscillations driven by mixing dynamics, transport delays, and mass flow adjustments by consumers. These oscillations can increase wear and cost and may potentially lead to system failure. This study addresses the asympt

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Ponzoni, Elisa, Rafaela Cardoso, and Cristina Jommi. "Numerical Thermo-Hydraulic Simulation of Infiltration and Evaporation of Small-Scale Replica of Typical Dike Covers." Applied Sciences 14, no. 22 (2024): 10170. http://dx.doi.org/10.3390/app142210170.

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Measurements taken on a historical dike in the Netherlands over one year showed that interaction with the atmosphere led to oscillation of the piezometric surface of about 0.7 m. The observation raised concerns about the long-term performance of similar dikes and promoted a deeper investigation of the response of the cover layer to increasing climatic stresses. An experimental and numerical study was undertaken, which included an investigation in the laboratory of the unsaturated behavior of a scaled replica of the field cover. A sample extracted from the top clayey layer in the dike was subje

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Stockinger, Martin, and Johann Tockner. "Microstructure Modeling as a Tool to Optimize Forging of Critical Aircraft Parts." Materials Science Forum 467-470 (October 2004): 683–88. http://dx.doi.org/10.4028/www.scientific.net/msf.467-470.683.

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Forging of high strength nickel base superalloys 720 and 718 for aircraft parts requires the usage of finite element simulations to ensure a proper thermo-mechanical treatment. Because of the strong mechanical requirements and narrow specifications of such parts not only a correct, defect free final geometry is necessary, but also a defined microstructure. The crucial point is therefore, to control all process parameters in a way to achieve the demanded properties. The typical forging processes like hydraulic, screw press and hammer forging imply a broad spectrum of strain rates. The influence

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Baujard, Clément, Pauline Rolin, Eléonore Dalmais, Régis Hehn, and Albert Genter. "Soultz-sous-Forêts Geothermal Reservoir: Structural Model Update and Thermo-Hydraulic Numerical Simulations Based on Three Years of Operation Data." Geosciences 2021, no. 11(12) (2021): 15. https://doi.org/10.3390/geosciences11120502.

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The geothermal powerplant of Soultz-sous-Forêts (France) is investigating the possibility of producing more energy with the same infrastructure by reinjecting the geothermal fluid at lower temperatures. Indeed, during the operation of the powerplant, the geothermal fluid is currently reinjected at 60–70 °C in a deep fractured granite reservoir, and the MEET project aims to test its reinjection at 40 °C. A 3D hydrothermal study was performed in order to evaluate the spreading of the thermal front during colder reinjection and its impact on the production temperature. In the

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Papafotiou, A., R. Senger, C. Li, et al. "A prediction–evaluation approach to the full-scale emplacement experiment (FE) in Mont Terri." Geological Society, London, Special Publications 482, no. 1 (2018): 39–73. http://dx.doi.org/10.1144/sp482.10.

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AbstractA prediction–evaluation approach is developed to assess the propagation of parameter, conceptual and scenario uncertainties in the estimated near-field temperatures of the full-scale emplacement experiment at the Mont Terri rock laboratory. The uncertainty assessment is performed using a three-dimensional thermo-hydraulic numerical model of the full-scale emplacement experiment that represents the emplaced materials and surrounding Opalinus Clay and accounts for heat generation at the heaters. The propagation of parametric uncertainties is assessed using a first-order second-moment met

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Baujard, Clément, Pauline Rolin, Éléonore Dalmais, Régis Hehn, and Albert Genter. "Soultz-sous-Forêts Geothermal Reservoir: Structural Model Update and Thermo-Hydraulic Numerical Simulations Based on Three Years of Operation Data." Geosciences 11, no. 12 (2021): 502. http://dx.doi.org/10.3390/geosciences11120502.

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The geothermal powerplant of Soultz-sous-Forêts (France) is investigating the possibility of producing more energy with the same infrastructure by reinjecting the geothermal fluid at lower temperatures. Indeed, during the operation of the powerplant, the geothermal fluid is currently reinjected at 60–70 °C in a deep fractured granite reservoir, and the MEET project aims to test its reinjection at 40 °C. A 3D hydrothermal study was performed in order to evaluate the spreading of the thermal front during colder reinjection and its impact on the production temperature. In the first step, a 3D str

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Zipplies, Johannes, Janybek Orozaliev, Ulrike Jordan, and Klaus Vajen. "Heat Consumer Model for Robust and Fast Simulations of District Heating Networks Using Modelica." Electronics 13, no. 7 (2024): 1201. http://dx.doi.org/10.3390/electronics13071201.

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Dynamic thermo-hydraulic simulations of district heating networks (DHN) are essential to investigate novel concepts for their sustainable design and operation. To develop solutions for a particular case study, numerous long-term simulations are required. Therefore, computational effort for simulation is critical. Heat consumers (HC) are numerous and determine the dynamics of mass flows and return temperatures in the DHN. Thus, the way in which HCs are modeled has significant impact on the computational effort and the results of the simulation. This article presents a novel Modelica-based model

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Chauhan, Parul, Elio Moussa, Noémie Prime, Simon Wheeler, and Olivier Plé. "Simulating the drying behavior of rammed earth columns." E3S Web of Conferences 195 (2020): 01025. http://dx.doi.org/10.1051/e3sconf/202019501025.

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Rammed earth construction provides an efficient alternative construction material to limit energy consumption and CO2 emission. It possesses various characteristics of a sustainable material, but its mechanical capacity is sensitive to humidity variations. It is, therefore, important to better understand water transport within rammed earth when subjected to varying ambient conditions. In this context, the present work aims to analyze the hydraulic behavior of a reduced piece of rammed earth wall consisting of a column of size 14cm x 14cm x 30cm subjected to drying from the initial compaction w

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Liu, Xiaoqiang, Ying Sun, Tiankui Guo, Minou Rabiei, Zhanqing Qu, and Jian Hou. "Numerical simulations of hydraulic fracturing in methane hydrate reservoirs based on the coupled thermo-hydrologic-mechanical-damage (THMD) model." Energy 238 (January 2022): 122054. http://dx.doi.org/10.1016/j.energy.2021.122054.

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Di Maio, P. A., P. Arena, F. D’Aleo, et al. "Thermal-hydraulic and thermo-mechanical simulations of Water-Heavy Liquid Metal interactions towards the DEMO WCLL breeding blanket design." Fusion Engineering and Design 146 (September 2019): 2712–16. http://dx.doi.org/10.1016/j.fusengdes.2019.04.093.

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Sivakumar, Karthikeyan, N. Kulasekharan, and E. Natarajan. "Computational Investigations in Rectangular Convergent and Divergent Ribbed Channels." International Journal of Turbo & Jet-Engines 35, no. 2 (2018): 193–201. http://dx.doi.org/10.1515/tjj-2016-0032.

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Abstract Computational investigations on the rib turbulated flow inside a convergent and divergent rectangular channel with square ribs of different rib heights and different Reynolds numbers (Re=20,000, 40,000 and 60,000). The ribs were arranged in a staggered fashion between the upper and lower surfaces of the test section. Computational investigations are carried out using computational fluid dynamic software ANSYS Fluent 14.0. Suitable solver settings like turbulence models were identified from the literature and the boundary conditions for the simulations on a solution of independent grid

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Plaznik, Uroš, Blaž Breznik, and Borut Prašnikar. "Theoretical Study of Liquid Flow and Temperature Distribution in OF-Cooled Power Transformers." Energies 17, no. 3 (2024): 571. http://dx.doi.org/10.3390/en17030571.

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The objective of the paper is to analyse the effects of various geometrical and operating parameters on the liquid flow distribution in OF-cooled power transformers. Our investigation includes two cases: one with a simplified winding geometry and another that closely resembles the actual winding geometry. The analyses were carried out using computational fluid dynamics (CFD) and custom, internally developed thermo-hydraulic models. Our findings confirm that buoyancy forces rather than the pump drive the liquid flow within the windings of an OF-cooled power transformer. The results also show th

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Krzaczek, M., and J. Tejchman. "Hydraulic fracturing process in rocks – small-scale simulations with a novel fully coupled DEM/CFD-based thermo-hydro-mechanical approach." Engineering Fracture Mechanics 289 (September 2023): 109424. http://dx.doi.org/10.1016/j.engfracmech.2023.109424.

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Saha, Sandip, V. Ramachandra Prasad, O. Anwar Beg, and Apurba Narayan Das. "Thermo-Hydraulic Phenomena of Water-Al₂O₃ Nanofluid Flow Over a Rectangular Channel with Trapezoidal Obstacles." Journal of Nanofluids 12, no. 5 (2023): 1383–96. http://dx.doi.org/10.1166/jon.2023.2027.

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Numerical simulations of water-Al2O3 nanofluid flow in a rectangular channel with two trapezoidal obstacles have been studied, which has rmarkable effect in various engineering applications. The governing equations have been solved using SIMPLEC algorithm and FLUENT software has been used to visualize the simulation results. Motivation of this work is to examine the dynamic behavior of laminar water-Al2O3 nanofluid flow for volume fraction, ψ = 0%, 2%, and 4%. The present study analyzes different hydrothermal flow phenomena with the variation in obstacle height and ψ. Moreover, the simulation

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Muzzioli, Gabriele, Luca Montorsi, Andrea Polito, Andrea Lucchi, Alessandro Sassi, and Massimo Milani. "About the Influence of Eco-Friendly Fluids on the Performance of an External Gear Pump." Energies 14, no. 4 (2021): 799. http://dx.doi.org/10.3390/en14040799.

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This paper wants to investigate the effects of eco-friendly fluids on the thermo-fluid-dynamic performance of external gear pumps in order to provide a first response to the increasingly urgent demands of the green economy. A computational fluid dynamics (CFD) approach based on the overset mesh technique was developed for the simulation of the full 3D geometry of an industrial pump, including all the characteristic leakages between components. A sensibility analysis of the numerical model with respect to different fluid properties was performed on a commonly used mineral oil, showing the key r

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Koca, Aliihsan, Oguzkan Senturk, Ömer Akbal, and Hakan Özcan. "Techno-Economic Optimization of Radiator Configurations in Power Transformer Cooling." Designs 8, no. 1 (2024): 15. http://dx.doi.org/10.3390/designs8010015.

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In this research, a numerical approach is created to assess the effective parameters of power transformer thermal management and, as a result, improve their cooling systems. This study analyzes the radiator’s thermal performance across several arrangements and optimizes the dimensions and configurations for varied cooling loads from a techno-economic perspective. The optimization criteria were the radiator’s height (L), fin spacing (D), and number of fins (N). Due to the great complexity of the generated models, the coupled thermo-hydraulic numerical simulations were carried out on a computer

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39

Bhattacharyya, Suvanjan, Arpan K. Sharma, Devendra K. Vishwakarma, and Akshoy Ranjan Paul. "Thermo-hydraulic characteristics of magnetic nanofluid in opposing and assisting minichannel under the influence of external magnetic field." Physics of Fluids 34, no. 10 (2022): 103609. http://dx.doi.org/10.1063/5.0104710.

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The present numerical study investigates the effect of external magnetic field on a magnetic nanofluid flow in an inclined channel. A uniform magnetic field is used to generate vortex in the channel for heat transfer enhancement. Fe3O4–water nanofluid of 2 vol. % is flowing in an inclined two-dimensional channel with a heated bottom wall. Numerical simulations are carried out for different inclination angles varying from −90° < θ < 90° at low Reynolds numbers, in the presence of external magnetic field of intensities varying from 0–2000 G. The heat sink has dimensions of 40 × 4 mm2, with

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Zhang, Liang, Qingjie Qi, Xuexi Chen, et al. "Impact of Stimulated Fractures on Tree-Type Borehole Methane Drainage from Low-Permeability Coal Reservoirs." Minerals 12, no. 8 (2022): 940. http://dx.doi.org/10.3390/min12080940.

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Tree-type hydraulic fracturing (TTHF) is a promising method applicable to the effective development of methane in low-permeability coal seams. However, a large-scale application of this technique is limited due to the unclear impact of stimulated fractures by TTHF on the effect of post-fracturing methane drainage. To address this issue, a multi-scale methane flow model of coupled thermo-hydro-mechanical (THM) processes in stimulated coal seams by TTHF was developed and verified against laboratory-based measurements. Using this proposed model, a systematic evaluation of the influence extent of

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Dénarié, Alice, Marcello Aprile, and Mario Motta. "The importance of an accurate numerical model for the simulations of new generation district heating systems." Journal of Physics: Conference Series 2893, no. 1 (2024): 012030. https://doi.org/10.1088/1742-6596/2893/1/012030.

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Abstract The aim of this work is to present a fast and accurate district heating simulation tool conceived to support the implementation of successful integrations of renewable energy sources along district heating networks. New generation district heating systems are facing new challenges related to increasing integrations of distributed renewable energy sources and new type of customers, such as prosumers. These connections introduce a great variety of low temperature highly variables energy profiles in the network that traditional modelling tools cannot properly simulate. Therefore, a speci

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Pascal, V., Y. Gorsse, N. Alpy, et al. "MULTIPHYSICS MODELISATION OF AN UNPROTECTED LOSS OF FLOW TRANSIENT IN A SODIUM COOLED FAST REACTORS USING A NEUTRONIC-THERMAL-HYDRAULIC COUPLING SCHEME." EPJ Web of Conferences 247 (2021): 07001. http://dx.doi.org/10.1051/epjconf/202124707001.

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Sodium cooled fast neutron reactors (SFR) are one of the selected reactor concepts in the framework of the Generation IV International Forum. In this concept, unprotected loss of cooling flow transients (ULOF), for which the non-triggering of backup systems is postulated, are regarded as potential initiators of core melting accidents. During an ULOF transient, spatial distributions of fuel, structure and sodium temperatures are affected by the core cooling flow decrease, which will modify the spatial and energy distribution of neutron in the core due to the spatial competition of neutron feedb

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Li, Zhen, Erik Spangenberg, Judith M. Schicks, and Thomas Kempka. "Numerical Simulation of Coastal Sub-Permafrost Gas Hydrate Formation in the Mackenzie Delta, Canadian Arctic." Energies 15, no. 14 (2022): 4986. http://dx.doi.org/10.3390/en15144986.

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The Mackenzie Delta (MD) is a permafrost-bearing region along the coasts of the Canadian Arctic which exhibits high sub-permafrost gas hydrate (GH) reserves. The GH occurring at the Mallik site in the MD is dominated by thermogenic methane (CH4), which migrated from deep conventional hydrocarbon reservoirs, very likely through the present fault systems. Therefore, it is assumed that fluid flow transports dissolved CH4 upward and out of the deeper overpressurized reservoirs via the existing polygonal fault system and then forms the GH accumulations in the Kugmallit–Mackenzie Bay Sequences. We i

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Mahmoodpour, Saeed, Mrityunjay Singh, Kristian Bär, and Ingo Sass. "Impact of Well Placement in the Fractured Geothermal Reservoirs Based on Available Discrete Fractured System." Geosciences 12, no. 1 (2022): 19. http://dx.doi.org/10.3390/geosciences12010019.

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Well placement in a given geological setting for a fractured geothermal reservoir is necessary for enhanced geothermal operations. High computational cost associated with the framework of fully coupled thermo-hydraulic-mechanical (THM) processes in a fractured reservoir simulation makes the well positioning a missing point in developing a field-scale investigation. To enhance the knowledge of well placement for different working fluids, we present the importance of this topic by examining different injection-production well (doublet) positions in a given fracture network using coupled THM nume

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Mahmoodpour, Saeed, Mrityunjay Singh, Kristian Bär, and Ingo Sass. "Impact of Well Placement in the Fractured Geothermal Reservoirs Based on Available Discrete Fractured System." Geosciences 2022, no. 12(1) (2022): 18. https://doi.org/10.3390/geosciences12010019.

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Well placement in a given geological setting for a fractured geothermal reservoir is necessary for enhanced geothermal operations. High computational cost associated with the framework of fully coupled thermo-hydraulic-mechanical (THM) processes in a fractured reservoir simulation makes the well positioning a missing point in developing a field-scale investigation. To enhance the knowledge of well placement for different working fluids, we present the importance of this topic by examining different injection-production well (doublet) positions in a given fracture network using coupled THM nume

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Souayeh, Basma, Suvanjan Bhattacharyya, Najib Hdhiri, et al. "Effect of Magnetic Baffles and Magnetic Nanofluid on Thermo-Hydraulic Characteristics of Dimple Mini Channel for Thermal Energy Applications." Sustainability 14, no. 16 (2022): 10419. http://dx.doi.org/10.3390/su141610419.

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The combined effect of a magnetic baffle and a dimple turbulator on the heat transfer and pressure drop is investigated computationally in a mini channel. Fe3O4 magnetic nanofluid is used as a working fluid. The Reynolds number (Re) is varied from 150 to 210 and the magnetic field intensities range from 1200 G to 2000 G. Finite-volume based commercial computational fluid dynamics (CFD) solver ANSYS-Fluent 18.1 was used for the numerical simulations. A laminar viscous model is used with pressure-velocity coupling along with second-order upwind discretization and QUICK scheme for discretizing th

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Hao, Dongxue, Yexian Shi, Rong Chen, et al. "Response of Thermo-Hydro-Mechanical Fields to Pile Material in Pile–Soil System Under Freezing Based on Numerical Analysis." Buildings 15, no. 4 (2025): 534. https://doi.org/10.3390/buildings15040534.

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In engineering practice, various types of pile foundations are commonly employed to mitigate the impact of differential frost heave on structures in cold regions. However, the studies on how pile material properties influence the thermo-hydro-mechanical coupling fields during the freezing of the pile–soil system remain limited. To address this, a finite element model was developed to simulate the response of the pile–soil system under unidirectional freezing conditions. The numerical model in simulating ground temperature field and frost heave was first verified by comparison with experimental

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Cohen, Denis, Guillaume Jouvet, Thomas Zwinger, Angela Landgraf, and Urs H. Fischer. "Subglacial hydrology from high-resolution ice-flow simulations of the Rhine Glacier during the Last Glacial Maximum: a proxy for glacial erosion." E&G Quaternary Science Journal 72, no. 2 (2023): 189–201. http://dx.doi.org/10.5194/egqsj-72-189-2023.

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Abstract. At the Last Glacial Maximum (LGM), the Rhine Glacier complex (Rhine and Linth glaciers) formed large piedmont lobes extending north into the Swiss and German Alpine forelands. Numerous overdeepened valleys there were formed by repeated glaciations. A characteristic of these overdeepened valleys is their location close to the LGM ice margin, away from the Alps. Numerical models of ice flow of the Rhine Glacier indicate a poor fit between the sliding distance, a proxy for glacial erosion, and the location of these overdeepenings. Calculations of the hydraulic potential based on the com

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Dash, Ayush Prada, Tabish Alam, Md Irfanul Haque Siddiqui, et al. "Impact on Heat Transfer Rate Due to an Extended Surface on the Passage of Microchannel Using Cylindrical Ribs with Varying Sector Angle." Energies 15, no. 21 (2022): 8191. http://dx.doi.org/10.3390/en15218191.

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In this paper, the impact of an extended surface on the passage of a microchannel using cylindrical ribs with variable sector angles on heat transfer rate is presented using computer simulation. Extended surfaces in the form of cylindrical ribs of varying sector angles in the passage of microchannel in a staggered manner have been designed. The sidewalls of a new kind of microchannel incorporating five distinct ribs with sector angles ranging from 45° to 80° have been analyzed. Ansys Fluent workbench software has been exploited to simulate this novel design of a microchannel heat sink. A three

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Thiedau, Jan, Maximilian Bittens, Jobst Maßmann, and Sibylle Mayr. "How do uncertain parameters affect the analysis of host rock integrity? Methods and preliminary results for a generic clay rock site." Safety of Nuclear Waste Disposal 2 (September 6, 2023): 103. http://dx.doi.org/10.5194/sand-2-103-2023.

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Abstract. The thermal, hydraulic, and mechanical effects of excavating the repository mine and the thermal loading of nuclear waste on the safety of the geological barrier system are addressed in the regulations as integrity analyses. For repositories in clay rock, a modelling and assessment methodology has been developed in the ANSICHT (Methodik und Anwendungsbezug eines Sicherheits- und Nachweiskonzeptes für ein HAW-Endlager im Tonstein) project based on thermo-hydro-mechanically (THM) coupled simulations using the open-source software project OpenGeoSys and has been illustrated by its appli

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