2024-03-29T02:04:17Zhttps://upcommons.upc.edu/oai/requestoai:upcommons.upc.edu:2117/3969312024-01-28T01:07:22Zcom_2117_184576com_2117_184544com_2117_28577com_2117_80515com_2117_23714com_2117_28578com_2117_3989com_2117_28579com_2117_98851com_2117_28581com_2117_15797col_2117_184812col_2117_80524col_2117_3994col_2117_330351col_2117_3055
urn:hdl:2117/396931
Turbulent boundary layer in a 3-element high-lift wing: coherent structures identification
Montalà Sales, Ricard
Eiximeno Franch, Benet
Miró Jané, Arnau
Lehmkuhl, Oriol
Rodríguez Pérez, Ivette María
Universitat Politècnica de Catalunya. Doctorat en Física Computacional i Aplicada
Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics
Barcelona Supercomputing Center
Universitat Politècnica de Catalunya. TUAREG - Turbulence and Aerodynamics in Mechanical and Aerospace Engineering Research Group
Àrees temàtiques de la UPC::Aeronàutica i espai
Àrees temàtiques de la UPC::Física::Física de fluids
A large eddy simulation (LES) of the flow past a 30P30N high-lift three-element wing is performed at the angle of attack AoA = 9º and a Reynolds number of Re = 750,000, based on the nested chord. Results are validated against experimental data available in the literature, proving their reliability. The present work is focused on the boundary layer development along the main suction side, including the analysis of the evolution of the thickness, the friction Reynolds number, the shape factor and the Clauser pressure-gradient parameter, as well as the Reynolds stresses at given chord locations. Finally, a proper orthogonal decomposition (POD) is performed, which allows visualizing the main turbulent coherent structures present in a turbulent boundary layer.
2023-11-23T08:33:55Z
2023
2024-11-16
Part of book or chapter of book
Montala, R. [et al.]. Turbulent boundary layer in a 3-element high-lift wing: coherent structures identification. A: "Direct and Large Eddy Simulation XIII: proceedings of DLES13". Berlín: Springer, 2023, p. 170-176.
978-3-031-47028-8
http://hdl.handle.net/2117/396931
10.1007/978-3-031-47028-8_26
eng
https://link.springer.com/book/10.1007/978-3-031-47028-8
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-116937RB-C21/ES/ALGORITMOS DE INTELIGENCIA ARTIFICIAL Y COMPUTACION DE ALTAS PRESTACIONES PARA MODELADO DE TURBULENCIA, CONTROL DE FLUJO Y AEROACUSTICA./
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-116937RB-C22/ES/TOWARDS REAL-TIME ACTUATION STRATEGIES FOR FLOW CONTROL AND NOISE REDUCTION IN AIRCRAFTS./
Restricted access - publisher's policy
Springer
oai:upcommons.upc.edu:2117/856902020-07-23T23:28:12Zcom_2117_80515com_2117_23714com_2117_28578com_2117_28577col_2117_80524openAccess
2016-04-14T13:42:31Z
urn:hdl:2117/85690
Fully-Coupled Electromechanical Simulations of the LV Dog Anatomy Using HPC: Model Testing and Verification
Aguado-Sierra, Jazmin
Santiago, Alfonso
Rivero, Matías I.
Lopez-Yunta, Mariña
Soto-Iglesias, David
Dux-Santoy, Lydia
Camara, Oscar
Vázquez, Mariano
Barcelona Supercomputing Center
Àrees temàtiques de la UPC::Enginyeria electrònica
Verification of electro-mechanic models of the heart require a good amount of reliable, high resolution, thorough in-vivo measurements. The detail of the mathematical models used to create simulations of the heart beat vary greatly. Generally, the objective of the simulation determines the modeling approach. However, it is important to exactly quantify the amount of error between the various approaches that can be used to simulate a heart beat by comparing them to ground truth data. The more detailed the model is, the more computing power it requires, we therefore employ a high-performance computing solver throughout this study. We aim to compare models to data measured experimentally to identify the effect of using a mathematical model of fibre orientation versus the measured fibre orientations using DT-MRI. We also use simultaneous endocardial stimuli vs an instantaneous myocardial stimulation to trigger the mechanic contraction. Our results show that synchronisation of the electrical and mechanical events in the heart beat are necessary to create a physiological timing of hemodynamic events. Synchronous activation of all of the myocardium provides an unrealistic timing of hemodynamic events in the cardiac cycle. Results also show the need of establishing a protocol to quantify the zero-pressure configuration of the left ventricular geometry to initiate the simulation protocol; however, the predicted zero-pressure configuration of the same geometry was different, depending on the origin of the fibre field employed.
2016-04-14T13:42:31Z
2016-04-14T13:42:31Z
2015-01-01
Part of book or chapter of book
Aguado-Sierra, Jazmin [et al.]. Fully-Coupled Electromechanical Simulations of the LV Dog Anatomy Using HPC: Model Testing and Verification. A: "Statistical Atlases and Computational Models of the Heart - Imaging and Modelling Challenges". Springer, 2015, p. 114-122.
978-3-319-14677-5
http://hdl.handle.net/2117/85690
10.1007/978-3-319-14678-2_12
eng
Lecture Notes in Computer Science, 8896
http://link.springer.com/chapter/10.1007%2F978-3-319-14678-2_12
info:eu-repo/grantAgreement/SEV-2011-00067
info:eu-repo/grantAgreement/EC/FP7/611823/EU/Computer model derived indices for optimal patient-specific treatment selection and planning in Heart Failure/VP2HF
info:eu-repo/grantAgreement/MINECO/6PN/TIN2011-28067
Open Access
Springer
oai:upcommons.upc.edu:2117/847662020-07-23T23:28:12Zcom_2117_80515com_2117_23714com_2117_28578com_2117_28577col_2117_80524openAccess
2016-03-22T11:51:44Z
urn:hdl:2117/84766
3D Viscoelastic Anisotropic Seismic Modeling with High-Order Mimetic Finite Differences
Ferrer, Miguel
de la Puente, Josep
Farrés, Albert
Castillo, José E.
Barcelona Supercomputing Center
Àrees temàtiques de la UPC::Enginyeria electrònica
We present a scheme to solve three-dimensional viscoelastic anisotropic wave propagation on structured staggered grids. The scheme uses a fully-staggered grid (FSG) or Lebedev grid (Lebedev, J Sov Comput Math Math Phys 4:449–465, 1964; Rubio et al. Comput Geosci 70:181–189, 2014), which allows for arbitrary anisotropy as well as grid deformation. This is useful when attempting to incorporate a bathymetry or topography in the model. The correct representation of surface waves is achieved by means of using high-order mimetic operators (Castillo and Grone, SIAM J Matrix Anal Appl 25:128–142, 2003; Castillo and Miranda, Mimetic discretization methods. CRC Press, Boca Raton, 2013), which allow for an accurate, compact and spatially high-order solution at the physical boundary condition. Furthermore, viscoelastic attenuation is represented with a generalized Maxwell body approximation, which requires of auxiliary variables to model the convolutional behavior of the stresses in lossy media. We present the scheme’s accuracy with a series of tests against analytical and numerical solutions. Similarly we show the scheme’s performance in high-performance computing platforms. Due to its accuracy and simple pre- and post-processing, the scheme is attractive for carrying out thousands of simulations in quick succession, as is necessary in many geophysical forward and inverse problems both for the industry and academia.
2016-03-22T11:51:44Z
2016-03-22T11:51:44Z
2015
Part of book or chapter of book
Ferrer, Miguel [et al.]. 3D Viscoelastic Anisotropic Seismic Modeling with High-Order Mimetic Finite Differences. A: "Spectral and High Order Methods for Partial Differential Equations ICOSAHOM 2014. Selected papers from the ICOSAHOM conference, June 23-27, 2014, Salt Lake City, Utah, USA". Springer, 2015, p. 217-225.
978-3-319-19799-9
http://hdl.handle.net/2117/84766
10.1007/978-3-319-19800-2_18
eng
Lecture Notes in Computational Science and Engineering, 106 (2015)
http://link.springer.com/chapter/10.1007%2F978-3-319-19800-2_18
info:eu-repo/grantAgreement/EC/H2020/644202/EU/Geophysical Exploration using Advanced GAlerkin Methods/GEAGAM
Open Access
Springer
oai:upcommons.upc.edu:2117/856972022-05-17T10:08:43Zcom_2117_80518com_2117_23714com_2117_28578com_2117_28577com_2117_80515col_2117_80537col_2117_80524openAccess
2016-04-14T14:36:41Z
urn:hdl:2117/85697
Impact of springtime Himalayan-Tibetan Plateau snowpack on the onset of the Indian summer monsoon in coupled seasonal forecasts
Senan, Retish
Orsolini, Yvan J.
Weisheimer, Antje
Vitart, Frédéric
Balsamo, Gianpaolo
Stockdale, Timothy N.
Dutra, Emanuel
Doblas-Reyes, Francisco
Basang, Droma
Barcelona Supercomputing Center
Àrees temàtiques de la UPC::Enginyeria electrònica::Impacte ambiental
The springtime snowpack over the Himalayan–Tibetan Plateau (HTP) region and Eurasia has long been suggested to be an influential factor on the onset of the Indian summer monsoon. To assess the impact of realistic initialization of springtime snow over HTP on the onset of the Indian summer monsoon, we examine a suite of coupled ocean–atmosphere 4-month ensemble reforecasts made at the European Centre for Medium-Range Weather Forecasts, using their Seasonal Forecasting System 4. The reforecasts were initialized on 1 April every year for the period 1981–2010. In these seasonal reforecasts, the snow is initialized “realistically” with ERA-Interim/Land Reanalysis. In addition, we carried out an additional set of forecasts, identical in all aspects except that initial conditions for snow-related land surface variables over the HTP region are randomized. We show that high snow depth over HTP influences the meridional tropospheric temperature gradient reversal that marks the monsoon onset. Composite difference based on a normalized HTP snow index reveal that, in high snow years, (1) the onset is delayed by about 8 days, and (2) negative precipitation anomalies and warm surface conditions prevail over India. We show that about half of this delay can be attributed to the realistic initialization of snow over the HTP region. We further demonstrate that high April snow depths over HTP are not uniquely influenced by El Nino-Southern Oscillation, the Indian Ocean Dipole or the North Atlantic Oscillation.
2016-04-14T14:36:41Z
2016-04-14T14:36:41Z
2016-02-20
Article
Senan, Retish [et al.]. Impact of springtime Himalayan-Tibetan Plateau snowpack on the onset of the Indian summer monsoon in coupled seasonal forecasts. "Climate Dynamics", 20 Febrer 2016, p. 1-17.
0930-7575
http://hdl.handle.net/2117/85697
10.1007/s00382-016-2993-y
eng
http://link.springer.com/article/10.1007%2Fs00382-016-2993-y
info:eu-repo/grantAgreement/EC/FP7/308378/EU/Seasonal-to-decadal climate Prediction for the improvement of European Climate Services/SPECS
http://creativecommons.org/licenses/by-nc-nd/4.0/es/
Open Access
Attribution-NonCommercial-NoDerivs 4.0 Spain
Springer
oai:upcommons.upc.edu:2117/1148502020-07-23T23:28:13Zcom_2117_80515com_2117_23714com_2117_28578com_2117_28577col_2117_80524openAccess
2018-03-06T11:06:38Z
urn:hdl:2117/114850
High-Performance Computing: Do’s and Dont’s
Houzeaux, Guillaume
Borrell, Ricard
Fournier, Yvan
Garcia-Gasulla, Marta
Göbbert, Jens H.
Hachem, Elie
Mehta, Vishal
Mesri, Youssef
Owen, Herbert
Vázquez, Mariano
Barcelona Supercomputing Center
Àrees temàtiques de la UPC::Informàtica
Computational fluid dynamics (CFD) is the main field of computational mechanics that has historically benefited from advances in high-performance computing. High-performance computing involves several techniques to make a simulation efficient and fast, such as distributed memory parallelism, shared memory parallelism, vectorization, memory access optimizations, etc. As an introduction, we present the anatomy of supercomputers, with special emphasis on HPC aspects relevant to CFD. Then, we develop some of the HPC concepts and numerical techniques applied to the complete CFD simulation framework: from preprocess (meshing) to postprocess (visualization) through the simulation itself (assembly and iterative solvers).
2018-03-06T11:06:38Z
2018-03-06T11:06:38Z
2018-02-14
Part of book or chapter of book
Houzeaux, G. [et al.]. High-Performance Computing: Do’s and Dont’s. A: "Computational Fluid Dynamics - Basic Instruments and Applications in Science". InTech, 2018, p. 3-41.
978-953-51-3791-7
http://hdl.handle.net/2117/114850
10.5772/intechopen.72042
eng
https://www.intechopen.com/books/computational-fluid-dynamics-basic-instruments-and-applications-in-science/high-performance-computing-dos-and-don-ts
info:eu-repo/grantAgreement/EC/H2020/689772/EU/HPC for Energy/HPC4E
info:eu-repo/grantAgreement/EC/H2020/676629/EU/Energy oriented Centre of Excellence for computer applications/EoCoE
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Open Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
InTech
oai:upcommons.upc.edu:2117/868892020-07-23T23:28:13Zcom_2117_80515com_2117_23714com_2117_28578com_2117_28577col_2117_80524openAccess
2016-05-10T15:55:30Z
urn:hdl:2117/86889
FLEX-MPI: An MPI Extension for Supporting Dynamic Load Balancing on Heterogeneous Non-dedicated Systems
Martin, Gonzalo
Marinescu, Maria-Cristina
Singh, David E.
Carretero, Jesús
Barcelona Supercomputing Center
Àrees temàtiques de la UPC::Enginyeria electrònica
This paper introduces FLEX-MPI, a novel runtime approach for the dynamic load balancing of MPI-based SPMD applications running on heterogeneous platforms in the presence of dynamic external loads. To effectively balance the workload, FLEX-MPI monitors the actual performance of applications via hardware counters and the MPI profiling interface—with a negligible overhead and minimal code modifications. Our results show that by using this approach the execution time of an application may be significantly reduced.
2016-05-10T15:55:30Z
2016-05-10T15:55:30Z
2013
Part of book or chapter of book
Martin, Gonzalo [et al.]. FLEX-MPI: An MPI Extension for Supporting Dynamic Load Balancing on Heterogeneous Non-dedicated Systems. A: 19th International Conference, Aachen, Germany, August 26-30, 2013. Proceedings. "Euro-Par 2013 Parallel Processing". Springer International Publishing, 2013, p. 138-149.
978-3-642-40046-9
http://hdl.handle.net/2117/86889
10.1007/978-3-642-40047-6_16
eng
http://link.springer.com/chapter/10.1007%2F978-3-642-40047-6_16
info:eu-repo/grantAgreement/MINECO/IPT-430000-2010-14
info:eu-repo/grantAgreement/EC/FP7/287759/EU/High Performance and Embedded Architecture and Compilation/HIPEAC
Open Access
Springer International Publishing
oai:upcommons.upc.edu:2117/852062020-07-23T23:28:13Zcom_2117_80515com_2117_23714com_2117_28578com_2117_28577col_2117_80524openAccess
2016-04-05T12:38:00Z
urn:hdl:2117/85206
Parallel Implementation of Domain Composition Methods
Houzeaux, Guillaume
Cajas García, Juan Carlos
Eguzkitza, Beatriz
Vázquez, Mariano
Barcelona Supercomputing Center
Àrees temàtiques de la UPC::Enginyeria mecànica
Domain composition methods (DCM) consist of obtaining a solution to a problem on a domain, from the formulations of the same problem expressed on various subdomains. These methods have therefore the oppostive objective to domain decomposition methods (DDM). However, they are sometimes based on the same methodology as after decomposing, DDM have to recompose. As a consequence, in the literature, the term DDM has many times been substituted for DCM.
In contrast to DCM, DDM are usually applied to matching meshes as their purpose consists mainly of distributing the work in parallel environments. DCM are powerful techniques that can be used for different purposes: to simplify the meshing of a complex geometry by dividing it into different meshable pieces; to perform local refinement to adapt to local mesh requirements; to treat subdomains in relative motion (Chimera, sliding mesh), etc.
The term DCM is generic and does not give any clue about how the fragmented solutions on the different subdomains are composed into a global one. In the literature, many methodologies have been proposed: they are mesh-based, formulation-based, or algebraic-based. In mesh-based formulations, the coupling is achieved at the mesh level, before the governing equations are assembled into an algebraic system (mesh conforming, shear-slip mesh update, HERMESH). The formulation-based counterpart recomposes the solution from the strong or weak formulation itself, and are implemented during the assembly of the algebraic system on the subdomain meshes. The different coupling techniques can be formulated at the strong and continous level, at the weak and continous or discrete levels (iteration-by-subdomains, mortar element, mesh free interpolation). Although the different methods usually lead to the same solutions at the continuous level, which usually coincides with the solution of the problem on the original domain, they have very different behaviour at the discrete level and accept very different implementations. Eventually, algebraic-based formulations treat the composition of the solutions directly on the matrix and right-hand side of the individual subdomain algebaric systems.
This chapter concentrates on the parallel implementations of some algebraic-based domain composition methods. The advantages of algebraic-based formulation over the mesh or formulation-based techniques, is that the method is relatively problem independent, its implementation can be hidden in the iterative solver operations, and the method can be made implicit and explicit relatively easily.
2016-04-05T12:38:00Z
2016-04-05T12:38:00Z
2015-04
Part of book or chapter of book
Houzeaux, Guillaume [et al.]. Parallel Implementation of Domain Composition Methods. A: "See this image Techniques for Parallel, Distributed and Cloud Computing in Engineering". Stirlingshire (UK): Saxe-Coburg Publications, 2015, p. 61-92.
978-1874672685
1759-3158
http://hdl.handle.net/2117/85206
10.4203/csets.36.4
eng
Computational Science, Engineering & Technology Series, 36
http://www.ctresources.info/csets/chapter.html?id=569
Open Access
Saxe-Coburg Publications
oai:upcommons.upc.edu:2117/859022020-07-23T23:28:14Zcom_2117_80515com_2117_23714com_2117_28578com_2117_28577col_2117_80524openAccess
2017-04-08T00:30:44Z
urn:hdl:2117/85902
Elastic Full Waveform Inversion (FWI) of reflection data with a phase misfit function
Kormann, Jean
Rodríguez, Juan E.
Ferrer, Miguel
Gutiérrez, Natalia
de la Puente, Josep
Hanzich, Mauricio
Cela, José M.
Barcelona Supercomputing Center
Àrees temàtiques de la UPC::Enginyeria electrònica
Full Waveform Inversion of elastic dataset is challenging due to the complexity introduced by free-surface effects or P-S wave conversions among others. In this context, large offsets are preferred for inversion because they favor transmission modes which are more linearly related to P-wave velocity. In this paper, we present an original approach
which allows to dynamically select the near offset at each frequency. We illustrate this approach with the inversion of a dataset without density.
In order to deal with a more realistic scenario, we next present the inversion with density effects included into the modeling. As inverting density is known to be a hard task, we choose to not invert it. This approach leads to the use of a phase misfit function, which is more connected to the kinematics of the problem than the classic L2 norm.
2016-04-19T12:43:25Z
2017-04-08T00:30:44Z
2016-04-08
Part of book or chapter of book
Kormann, Jean [et al.]. Elastic FWI of reflection data with a phase misfit function. A: 6th International Conference, ISUM 2015, Mexico City, Mexico, March 9-13, 2015. "High Performance Computer Applications". Springer International Publishing, 2016, p. 277-284.
978-3-319-32242-1
1865-0929
http://hdl.handle.net/2117/85902
10.1007/978-3-319-32243-8_19
eng
Communications in Computer and Information Science, 595
http://link.springer.com/chapter/10.1007/978-3-319-32243-8_19
info:eu-repo/grantAgreement/EC/H2020/644202/EU/Geophysical Exploration using Advanced GAlerkin Methods/GEAGAM
info:eu-repo/grantAgreement/EC/H2020/689772/EU/HPC for Energy/HPC4E
Open Access
Springer International Publishing
oai:upcommons.upc.edu:2117/3740612022-10-06T14:36:01Zcom_2117_6164com_2117_28579com_2117_28577com_2117_80515com_2117_23714com_2117_28578com_2117_184821com_2117_28581com_2117_15797col_2117_6173col_2117_80524col_2117_374062col_2117_3055openAccess
2022-10-06T08:05:53Z
urn:hdl:2117/374061
An elastic software architecture for extreme-scale big data analytics
Serrano Garcia, Maria Aston
Marín, César A.
Queralt Calafat, Anna
Cordeiro, Cristovao
González Hierro, Marco
Pinho, Luis Miguel
Quiñones Moreno, Eduardo
Universitat Politècnica de Catalunya. Departament d'Enginyeria de Serveis i Sistemes d'Informació
Barcelona Supercomputing Center
Universitat Politècnica de Catalunya. inSSIDE - integrated Software, Service, Information and Data Engineering
Àrees temàtiques de la UPC::Informàtica::Enginyeria del software
This chapter describes a software architecture for processing big-data analytics considering the complete compute continuum, from the edge to the cloud. The new generation of smart systems requires processing a vast amount of diverse information from distributed data sources. The software architecture presented in this chapter addresses two main challenges. On the one hand, a new elasticity concept enables smart systems to satisfy the performance requirements of extreme-scale analytics workloads. By extending the elasticity concept (known at cloud side) across the compute continuum in a fog computing environment, combined with the usage of advanced heterogeneous hardware architectures at the edge side, the capabilities of the extreme-scale analytics can significantly increase, integrating both responsive data-in-motion and latent data-at-rest analytics into a single solution. On the other hand, the software architecture also focuses on the fulfilment of the non-functional properties inherited from smart systems, such as real-time, energy-efficiency, communication quality and security, that are of paramount importance for many application domains such as smart cities, smart mobility and smart manufacturing.
2022-10-06T08:05:53Z
2022-10-06T08:05:53Z
2022
Part of book or chapter of book
Serrano, M. [et al.]. An elastic software architecture for extreme-scale big data analytics. A: "Technologies and applications for big data value". Berlín: Springer, 2022, p. 89-110.
978-3-030-78306-8
http://hdl.handle.net/2117/374061
10.1007/978-3-030-78307-5_5
eng
https://link.springer.com/book/10.1007/978-3-030-78307-5
info:eu-repo/grantAgreement/EC/H2020/825473/EU/A Software Architecture for Extreme-ScaLe Big-Data AnalyticS in Fog CompuTIng ECosystems/ELASTIC
http://creativecommons.org/licenses/by/4.0/
Open Access
Attribution 4.0 International
Springer