GCS-Gauss Centre for Supercomputing-PRACE Awarded Projects

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GCS-Gauss Centre for Supercomputing-PRACE Awarded Projects

Find below the following excerpts of PRACE awarded projects published on the GCS website:

Title: Large-Eddy-Simulations of the Unsteady Aerodynamics of Oscillating Airfoils at Moderately High Reynolds Numbers

Principla Investigator: Prof. Dr. Dan S. Henningson, KTH Royal Institute of Technology, Stockholm (Sweden)

PRACE Call: 15

Resource awarded: 40 000 000 core hours on Hazel Hen, HLRS, GCS

Project Abstract
Recently there has been a large push in the aircraft industry to reduce its carbon footprint. Laminar flow control and Natural Laminar Flow (NLF) wing design have been proposed as one of the main options for reducing the drag on the airplane and hence its fuel consumption. One of the important aspects of aircraft design concerns dynamic stability and an understanding of the unsteady behavior of NLF airfoils is important for predicting the stability characteristics of the aircraft. Recent experimental studies on NLF airfoils have shown that their dynamic behavior differs from that of turbulent airfoils and that classical linearized models for unsteady airfoils fail to predict the unsteady behavior of NLF airfoils. Most notably, NLF airfoils exhibit non-linear aerodynamic responses to small-amplitude pitch oscillations whereas the classical theories predict only a linear response. In the current work we investigate the dynamics of pitching airfoils to understand the flow phenomenon which causes the breakdown of classical models, and also attempt to describe a new simplified model which takes into account the non-linearities observed in the NLF airfoils.

Read more details here.

Title: The SPHINX Simulations of the First Billion Years and Reionization

Principla Investigator: Dr Joakim Rosdahl, Centre de Recherche Astrophysique de Lyon (CRAL), France

PRACE Call: 17

Resource awarded: 54 000 000 core hours on JUWELS, FZ Jülich, GCS

Project Abstract
The formation of the first galaxies marked the end of the cosmological dark ages and the beginning of the Epoch of Reionization (EoR). Radiation from the first stars, hosted by the first galaxies, heated the surrounding inter-galactic gas via photo-ionization. As the ionized hydrogen bubbles grew and percolated, the whole Universe was transformed from a dark, cold, neutral state into a hot ionized one: reionization was completed, about a billion years after the Big Bang. This last major transition of the Universe is at the limit of our observational capabilities and is a key science driver of the foremost upcoming telescopes, such as the James Webb Space Telescope (JWST) and the Square Kilometre Array (SKA).

Read more details here.

Title: Two-dimensional inorganic materials under electron beam: insights from advanced first-principles calculations

Principla Investigator: Dr. Arkady Krasheninnikov, Helmholtz-Zentrum Dresden-Rossendorf (Germany)

PRACE Call: 14

Resource awarded: 16 million coure hours on Hazel Hen, HLRS, GCS

Project Abstract
HPC helps researchers understand experiments for observing real-time motion of lithium atoms in bi-layer graphene, paving the way for designing new materials for batteries and other electronics. Whether it is high-temperature superconductors and improved energy storage to bendable metals and fabrics capable of completely wicking liquids, materials scientists study and understand the physics of interacting atoms in solids to ultimately find ways to improve materials we use in every aspect of daily life. The frontier of materials science research lies not in alchemical trial and error, though; to better understand and improve materials today, researchers must be able to study material properties at the atomic scale and under extreme conditions. As a result, researchers have increasingly come to rely on simulations to complement or inform experiments into materials’ properties and behaviours.

Read more details here and here.

Title: R2Wall: Resolved LES to support Wall-Model Development

Principla Investigator: Koen Hillewaert, Ariane Frère, Michel Rasquin, Cenaero Research Center (Belgium)

PRACE Call: 14

Resource awarded: 30 million core hours on JUQEEN, JSC, GCS

Project Abstract
Wind turbine and aircraft design relies on numerical simulation. Current aerodynamic models represent turbulence not directly but model its averaged impact. Such models are only reliable near the design point and require vast experience of the design engineer. Industry wants therefore to enable more accurate methods, such as wall-modeled Large-Eddy Simulation (wmLES) which represents turbulent flow structures directly. R2Wall provides a high-resolution simulation of the NACA4412 airfoil as reference data for the development of wall-models for LES and turbulence models in general. This project has enabled the definition of guidelines for future computations, and the calibration of wall-models.

Read more details here.

Title: Emergent Locality in Quantum Systems with Long Range Interactions

Principla Investigator: Fabien Alet, Centre national de la recherche scientifique (CNRS), Toulouse University, France, and Dr. David J. Luitz, Max Planck Institute for the Physics of Complex Systems (MPIPKS), Dresden, Germany

PRACE Call: 14

Resource awarded: 20 million core hours on Hazel Hen of HLRS, GCS

Project Abstract
How fast can information travel in a quantum system? While special relativity yields the speed of light as a strict upper limit, many quantum systems at low energies are in fact described by nonrelativistic quantum theory, which does not contain any fundamental speed limit. Interestingly enough, there is an emergent speed limit in quantum systems with short ranged interactions which is far slower than the speed of light. Fundamental interactions between particles are, however, often of long range, such as dipolar interactions or Coulomb interactions. A very-large scale computational study performed on Hazel Hen revealed that there is no instantaneous information propagation even in the presence of extremely long ranged interactions and that most signals are contained in a spatio-temporal light cone for dipolar interactions.

Read more details here.

Title: Large Eddy Simulations of Micro-Vortex Generators for Shock Wave/Turbulent Boundary Layer Interaction

Principla Investigator: Julien Bodart, ISAE-SUPAERO, Université de Toulouse (France)

PRACE Call: 14

Resource awarded: 42.4 million core hours on JUQUEEN, JSC, GCS

Project Abstract
This project aims to investigate the influence of the height h and distance to the interaction d of microramp vortex generators (mVGs) placed upstream the interaction region in order to control the unsteady mechanisms and separation involved in a Shock Boundary Layer Interaction (SBLI). It follows a previous high-fidelity Large Eddy Simulations (LES) campaignon french national supercomputers (GENCI grant).

Read more details here.

Title: HETS /Heat (and Mass) Transfer in Turbulent Suspension

Principla Investigator: Luca Brandt, Department of Mechanics, KTH, Royal Institute of Technology (Sweden)

PRACE Call: 14

Resource awarded: 18.3 million core hours at Marconi-KNL, CINECA, Italy and 11.7 million core hours at Hazel Hen, HLRS, GCS

Project Abstract
Droplets evaporating in a carrier fluid are encountered in a variety of engineering processes of great practical importance, like aerosols, spray dryers and most importantly combustion of liquid sprays. The topic is of strong relevance to answer two important societal challenges: secure, clean and efficient energy and smart, green and integrated transport.

Read more details here.

Title: LACEHIP, LArge scale CEllular model of the HIPpocampus

Principla Investigator: Michele Migliore, Consiglio Nazionale delle Ricerche (CNR), I.B.F. (Italy)

PRACE Call: 14

Resource awarded
21 million core hours at JUQUEEN, JSC, GCS

Project Abstract
In this project, the focus was on the development of the first detailed and realistic large scale 3D model of the CA1 region of the hippocampus. The hippocampus (a latin word derived from Greek to indicate a seahorse) is a small brain region located deep in the brain, in the medial temporal lobe, underneath the cortical surface (see figure below). Its structure is divided into two halves which lie in the left and right sides of the brain. The organ is curved with a shape that resembles a seahorse, explaining its name. It is well known that the processes related to higher brain function, such as memory, learning, and spatial navigation involve this region (Squire et al., 2004; Andersen et al., 2006; Morris 2006) that which, for this reason, is one of the most studied both experimentally and theoretically.

Read more details here.

This article was first published on www.prace-ri.eu on Thursday 31 January 2019.

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