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Latent Space Subdivision: Stable and Controllable Time Predictions for Fluid Flow [article]

Steffen Wiewel, Byungsoo Kim, Vinicius C. Azevedo, Barbara Solenthaler, Nils Thuerey
2020 arXiv   pre-print
To achieve stable predictions for long-term flow sequences, a convolutional neural network (CNN) is trained for spatial compression in combination with a temporal prediction network that consists of stacked  ...  This allows to distinctively alter the encoded quantities without interfering with the remaining latent space values and hence maximizes external control.  ...  Source code and video: latent-space-subdivision/.  ... 
arXiv:2003.08723v1 fatcat:ovdf7njbhfh5lpeswa6olgubxm

Heat transfer analysis of encapsulated phase change material for thermal energy storage

Weihuan Zhao, Ali F. Elmozughi, Alparslan Oztekin, Sudhakar Neti
2013 International Journal of Heat and Mass Transfer  
The flow is laminar.Figures 35 and 36 show the location of the propagating liquid/solid interface predicted by the enthalpy -porosity method at various times for the turbulent flows in the channel for  ...  Figures 33 and 34 show the location of the propagating liquid/solid interface predicted by the enthalpy -porosity method at various times for the laminar flows in the channel for the blockage of 0.7 and  ... 
doi:10.1016/j.ijheatmasstransfer.2013.03.061 fatcat:sxpmowhry5fxpgz4aji2oxz3ee

Modelling of macrosegregation during solidification processes using an adaptive domain decomposition method

Th U Kaempfer, M Rappaz
2003 Modelling and Simulation in Materials Science and Engineering  
The fluid flow and solute transport equations are then solved on the different meshes using a Dirichlet-Neumann substructuring iterative method, together with the mortar technique to deal with the non-conforming  ...  The physical model is based on volume averaged conservation equations for energy, mass, momentum, and solute.  ...  for Technology and Innovation.  ... 
doi:10.1088/0965-0393/11/4/310 fatcat:apiqnmr6wngmzim36fg24c576i

Solidification of Undercooled Melts of Al-Based Alloys on Earth and in Space

Dieter M. Herlach, Stefan Burggraf, Peter Galenko, Charles-André Gandin, Asuncion Garcia-Escorial, Hani Henein, Christian Karrasch, Andrew Mullis, Markus Rettenmayr, Jonas Valloton
2017 JOM: The Member Journal of TMS  
flights, sounding rocket missions and using the Electro-Magnetic Levitator EML multi-user facility on board the International Space Station ISS.  ...  Containerless processing of droplets and drops by atomization and electromagnetic levitation are applied to undercool metallic melts and alloys prior to solidification.  ...  P.K.G. is grateful to the German Space Center Space Management under contract number 50WM1541 and the Russian Science Foundation under contract number 16-11-10095 for financial support.  ... 
doi:10.1007/s11837-017-2402-y fatcat:iecgd7n7b5f33fhbhce6krzbje

Surface water and groundwater: unifying conceptualization and quantification of the two "water worlds"

Brian Berkowitz, Erwin Zehe
2020 Hydrology and Earth System Sciences  
We develop this general notion by detailing the role of preferential flow for residence times and chemical transport, as well as for energy conversions and energy dissipation associated with flows of water  ...  We discuss key features of fluid flow and chemical transport dynamics in these two systems – surface water and groundwater – and then focus on chemical transport, merging treatment of many of these dynamics  ...  The critical zone, furthermore, crucially controls the Bowen ratio (the partitioning of net radiation energy into sensible and latent heat), and soil water available to plants is a key controlling factor  ... 
doi:10.5194/hess-24-1831-2020 fatcat:qs3gaskxs5b4lfrewfkwfm3kuy

Flow Instability in Parallel Channels with Water at Supercritical Pressure: A Review

Edward Shitsi, Seth Kofi Debrah, Vincent Yao Agbodemegbe, Emmanuel Ampomah-Amoako
2018 World Journal of Engineering and Technology  
In order to help understand how flow instability investigations are carried out and also highlight the need to understand flow instability phenomenon and equip the designers and operators of industrial  ...  Flow instability is therefore undesirable and should be avoided in the design and operation of industrial equipment.  ...  As a result, marginal stability boundaries (MSBs) in a parameter space can be determined and the space is divided into stable and unstable regions. In order to obtain stability boundaries in Time-E.  ... 
doi:10.4236/wjet.2018.61008 fatcat:av7r42x6grcuzktjmaml2qbvuy

Energy Audit of Health Care Facilities: Dynamic Simulation of Energy Performances and Energy-Oriented Refurbishment of System and Equipment for Microclimatic Control

Fabrizio Ascione, Nicola Bianco, Rosa Francesca De Masi, Filippo de Rossi, Claudio De Stasio, Giuseppe Peter Vanoli
2016 American Journal of Engineering and Applied Sciences  
All data and boundary conditions for dynamic energy investigations have been carefully selected, also by means of in-situ studies, in order to provide a reliable model.  ...  of numerical studies, may optimize the energy performances of the building, as well as the indoor microclimatic control.  ...  They gave us the opportunity of experiments and monitoring of the building performance. Moreover, we thank the editor and the anonymous reviewers for the advices.  ... 
doi:10.3844/ajeassp.2016.814.834 fatcat:ibogtqiw4jfmxafz2qrsjq6qr4

Thermal energy storage technologies and systems for concentrating solar power plants

Sarada Kuravi, Jamie Trahan, D. Yogi Goswami, Muhammad M. Rahman, Elias K. Stefanakos
2013 Progress in Energy and Combustion Science  
This paper presents a review of thermal energy storage system design methodologies and the factors to be considered at different hierarchical levels for concentrating solar power (CSP) plants.  ...  Thermal energy storage forms a key component of a power plant for improvement of its dispatchability.  ...  Acknowledgements This work was done as part of projects funded by USDOE (DE-EE0003590) and the Florida Energy Systems Consortium (FESC).  ... 
doi:10.1016/j.pecs.2013.02.001 fatcat:fbsb7tblgzb2vf5h6wqakkatyi

TES-PD: A Fast and Reliable Numerical Model to Predict the Performance of Thermal Reservoir for Electricity Energy Storage Units

Alberto Benato, Francesco De Vanna, Ennio Gallo, Anna Stoppato, Giovanna Cavazzini
2021 Fluids  
a new and more detailed model, named TES-PD, which works with time and space variable fluid and solid properties.  ...  However, wind and solar production are difficult to predict; hence, to avoid a mismatch between electricity supply and demand, there is a need for energy storage units.  ...  stable water (like PHS) or natural gas (as CAES) flow rate.  ... 
doi:10.3390/fluids6070256 fatcat:lq5rjbtr3fb2lisr4lxy7mo2fm

The roger adams symposium: Papers presented at a symposium in honor of roger adams at the university of illinois, september 3-4, 1954. W. R. Brode, T. R. Johnson, S. M. McElvain, R. L. Shriner, W. M. Stanley, and E. H. Volwiler. John Wiley and Sons, Inc., New York(1955). 140 pages.$3.75

Harry H. Wasserman
1955 AIChE Journal  
Mc- Millen(15) presented a criterion for Bingham plastic fluids which predicts stable laminar flow at nearly three times the velocities calculated at the point f = 0.008.  ...  A negative value is used if the flow is upward in the subdivision, and a positive value for downward flow. The total number of subdivisions is N.  ... 
doi:10.1002/aic.690010405 fatcat:xb5e2npkgzgjtj3wb7cfu75y7a

Review on Dynamic Van der Waals Theory in two-phase flow

Tao Zhang, Jisheng Kou, Shuyu Sun
2017 Advances in Geo-Energy Research  
After more than ten years development, this theory has been widely used to study the fluid flow in vaporing and boiling process, e.g. droplet motion.  ...  In this paper we review the Dynamic Van der Waals theory, which is a recent developed method to study phase separation and transition process in multiphase flow.  ...  Acknowledgements The authors would like to express their gratitude to the anonymous referees for their efforts in providing valuable comments.  ... 
doi:10.26804/ager.2017.02.08 fatcat:72b2sdhtz5bjhfxnxgwpoo6zz4

CFD Parametric Studies for Global Performance Improvement of Open Refrigerated Display Cabinets

Pedro Dinis Gaspar, L. C. Carrilho Gonçalves, R. A. Pitarma
2012 Modelling and Simulation in Engineering  
The parametric studies are devoted to the analysis of the thermal response and behaviour inside the food conservation space influenced by (1) air flow rate through the evaporator heat exchanger; (2) air  ...  curtain behaviour; (3) hole dimensions and distribution of the back panel; (4) discharge and return grilles angles; and (5) flow deflectors inside the internal duct.  ...  Figure 1 : 1 Subdivision of the air curtain region by control volumes and sign convention of the variables.  ... 
doi:10.1155/2012/867820 fatcat:k27wks3p7rhoxavrl3tnexvlsm

Statistically motivated model of mechanisms controlling evolution of deformation band substructure

Jan Kratochvíl, Martin Kružík
2016 International journal of plasticity  
For symmetric double slip compression, the model provides an explanation of the observed band orientation and band width, and of the significant change in structural morphology seen as the band reorientation  ...  The rigid-plastic model points to the main constituents which control the fragmentation mechanism: anisotropy of the hardening matrix, anisotropic resistance of the boundaries to slip, and the bowing (  ...  Results and discussion The energetic function Jðx; lÞ expressed in (25) is controlled by the self-hardening h, by the latent-to-self hardening ratio q, by the flow stress s, by the shear modulus G, by  ... 
doi:10.1016/j.ijplas.2016.01.016 fatcat:iu4ei3ilgzffzfzoa4teufequm

Anatomical and functional organization of the human substantia nigra and its connections

Yu Zhang, Kevin Michel-Herve Larcher, Bratislav Misic, Alain Dagher
2017 eLife  
Behavioral measures from delay discounting and flanker tasks supported a role for the value-coding medial SN network in decisional impulsivity, while the salience-coding ventral SN network was associated  ...  cortex and striatum and encodes salience (equal response to wins and losses).  ...  We thank Daniel Margulies for valuable discussions and the editors and reviewers of this manuscript for many helpful suggestions.  ... 
doi:10.7554/elife.26653 pmid:28826495 pmcid:PMC5606848 fatcat:ibc4jj3gqzegziibb5zf6qols4

Physics-based Deep Learning [article]

Nils Thuerey and Philipp Holl and Maximilian Mueller and Patrick Schnell and Felix Trost and Kiwon Um
2021 arXiv   pre-print
We live in exciting times: these methods have a huge potential to fundamentally change what computer simulations can achieve.  ...  This digital book contains a practical and comprehensive introduction of everything related to deep learning in the context of physical simulations.  ...  Latent space subdivision: stable and controllable time predictions for fluid flow. Symposium on Computer Animation, 2020. URL:  ... 
arXiv:2109.05237v2 fatcat:dm2wyckg6fcxzhsxi4hmo76sny
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