Difference between revisions of "Ecfd:ecfd 4th edition"

Revision as of 16:46, 26 March 2021

Description

ECFD4 workshop logo.

Virtual event from 22nd to 26th of March 2021
Two types of sessions:
- common technical presentations: roadmaps, specific points.
- mini-workshops. Potential workshops are listed below.
Free of charge
More than 50 participants from academics (CERFACS, CORIA, IMAG, LEGI, UMONS, UVM, VUB), HPC center/experts (GENCI, IDRIS, NVIDIA, HPE) and industry (Safran, Ariane Group).

News

Annoncements on Linkedin

Objectives

Bring together experts in high-performance computing, applied mathematics and multi-physics CFDs
Identify the technological barriers of exaflopic CFD via numerical experiments
Identify industrial needs and challenges in high-performance computing
Propose action plans to add to the development roadmaps of the AVBP and YALES2 codes

Agenda

Plénière 1

Lundi 22/03/2021 9h00-9h20

Introduction (organisation, agenda semaine, etc.)

V. Moureau (CORIA), G. Balarac (LEGI), C. Piechurski (GENCI)

Plénière 2

Lundi 22/03/2021 9h20-11h20

Présentation des projets du workshop et Présentation des thématiques du hackathon

Responsables de projets

Plénière 3

Lundi 22/03/2021 11h20-12h00

Contrat de Progrès Jean Zay: Véhicule d'accompagnement des utilisateurs au portage des applications sur les nouvelles technologies

P.-F. Lavallée (IDRIS)

Plénière 4

Mardi 23/03/2021 9h00-10h00

Evolution de la programmation GPU – CUDA, OpenACC, Standard Langages (C++, Fortran)

F. Courteille (NVIDIA)

Plénière 5

Mercredi 24/03/2021 13h00-14h00

Le portage applicatif sur GPU de AVBP et Yales 2: Concrêtement comment cela se matérialise?

G. Staffelbach (CERFACS) & V. Moureau (CORIA)

Plénière 6

Jeudi 25/03/2021 9h00-10h00

Approche et démarche pour accompagner le portage d'un code sur GPU NVIDIA

P.-E. Bernard (HPE)

Plénière 7

Vendredi 26/03/2021 9h00-10h00

Roadmaps YALES2 & AVBP

V. Moureau (CORIA) & N. Odier (CERFACS)

Plénière 8

Vendredi 26/03/2021 15h00-17h00

Wrap-up : présentation des résultats et conclusion générale

Responsables de projets + V. Moureau (CORIA)

Thematics / Mini-workshops

These mini-workshops may change and cover more or less topics. This page will be adapted according to your feedback.

Combustion - B. Cuenot, CERFACS

H2 and alternative fuels combustion
turbulent combustion modeling

Dynamic mesh adaptation - G. Balarac, LEGI

anisotropic mesh adaptation
adaptation criteria for anisotropic mesh adaptation
adaptation of periodic domains

Multi-phase flows - V. Moureau, CORIA

scalar transport in two-phase flows
three-phase flows: contact angle

Numerics - G. Lartigue, CORIA

implicit time integration for compressible/incompressible flows
higher-order finite-volume schemes
finite-volume schemes for anisotropic meshes

Turbulent flows - P. Bénard, CORIA

turbulence injection
wall modeling
rotor modeling for wind or hydro turbines applications
advanced post processing for unsteady turbulence

User experience - R. Mercier, SAFRAN TECH

automation & workflows for HPC
on-line and off-line analysis of massive datasets

Fluid structure interaction - S. Mendez, IMAG

This project gathered three sub-projects related to fluid-structure interactions (FSI). Their common feature was the FSI solver from YALES2, which is based on a partitioned approach. The FSI solver couples an Arbitrary Lagrangian-Eulerian solver for predicting the fluid motion in a moving domain (FSI_ALE) and a solver for structural dynamics (FSI_SMS), which are both YALES2 solvers. The FSI solver has been initiated by Thomas Fabbri (LEGI, Grenoble) and the objectives of ECFD4 were to optimize it and generalize its use among several teams, by improving its performances, demonstrating its versatility and adding multiphysics effects. All the projects made interesting progree and will continue over the newt weeks/months.

Sub-project 1 (Thomas Fabbri and Guillaume Balarac, LEGI): The aim of this sub-project was to decrease the time spent in computing the fluid grid deformation, which is currently the most expensive part of the calculation. The strategy is to solve a deformation field on a coarse mesh and apply it to a fine mesh after interpolation. Many pieces exist in YALES2 related to such a task (using several grids, performing interpolations...), but they are currently not appropriate for this application. The work performed during the workshop consisted in identifying the different subroutines of interest and start coding the method. Many parts of the method are functional and the next step is to properly compbine them and test its efficiency.
Sub-project 2 (Barthélémy Thibaud and Simon Mendez, IMAG): The aim of this sub-project was to validate the FSI solver in the case of a flexible valve bent by a pulsatile flow. A proper workflow (sequence of runs) has been defined during the week to be able to run this simulation and the first results are extremely promising, with already fair comparisons with the reference results from the literature. This workshop has also contributed in enhacing the experience of the solver at IMAG.
Sub-project 3 (Likhitha Ramesh Reddy and Axelle Viré, TU Delft and Pierre Bénard, CORIA): The long-term aim of this sub-project is to perform simulations of the flow around floating wind turbines, which constitutes a huge challenge, as it gathers the difficulties of wind tubines flows, two-phase flows, and fluid-structure interactions between a fluid and a solid. During the workshop, the aim was to progress on two aspects: the use of the two-phase flow solver of YALES2, SPS, in a moving domain (coupling SPS and ALE) and the coupling with FSI. Both tasks were tackled: preliminary validation simulations were performed for the SPS-ALE solver, and the strategy to couple the SPS-ALE solver with the FSI has been clearly identified within the group.
Common work: TU Delft (Sub-project 3) needs to perform FSI without deformation of the structure, so that the coupling with the SMS solver may not be indispensable. Tests were performed to study the ability of the SMS to work in a regime of very stiff material to mimic rigid bodies, and first tests were very convincing. In the future however, it is planned to implement a rigid-body motion solver in YALES2 as an alternative to SMS. This task gathers the four teams of the project and is a clear shared objective of the next months.
Bugs and cleaning: minor bugs were identified in the FSI solver, mostly related to options rarely used. There were corrected and pushed in the YALES2 gitlab.
Documentation: the information shared between participants for the use and understanding of the SMS and FSI solvers has been directly gathered in the YALES2 wiki.

GENCI Hackathon - G. Staffelbach, CERFACS

Porting to GPU with OpenACC

@@ Line 130: / Line 130: @@
 * '''Sub-project 1 (Thomas Fabbri and Guillaume Balarac, LEGI):''' The aim of this sub-project was '''to decrease the time spent in computing the fluid grid deformation''', which is currently the most expensive part of the calculation. The strategy is to solve a deformation field on a coarse mesh and apply it to a fine mesh after interpolation. Many pieces exist in YALES2 related to such a task (using several grids, performing interpolations...), but they are currently not appropriate for this application. The work performed during the workshop consisted in identifying the different subroutines of interest and start coding the method. Many parts of the method are functional and the next step is to properly compbine them and test its efficiency.
 * '''Sub-project 2 (Barthélémy Thibaud and Simon Mendez, IMAG):''' The aim of this sub-project was '''to validate the FSI solver in the case of a flexible valve''' bent by a pulsatile flow. A proper workflow (sequence of runs) has been defined during the week to be able to run this simulation and the first results are extremely promising, with already fair comparisons with the reference results from the literature. This workshop has also contributed in enhacing the experience of the solver at IMAG.
-* '''Sub-project 3 (Likhitha Ramesh Reddy and Axelle Viré, TU Delft and Pierre Bénard, CORIA):''' The long-term aim of this sub-project is to perform simulations of the flow around floatting wind turbines, which constitutes a huge challenge, as it gathers the difficulties of wind tubines flows, two-phase flows, and fluid-structure interaction between a fluid and a solid of similar density. During the workshop, the aim was '''to progress on two aspects: the use of the two-phase flow solver of YALES2, SPS, in a moving domain (coupling SPS and ALE) and the coupling with FSI'''. Both tasks were tackled: preliminary validation simulations were performed for the SPS-ALE solver, and the strategy to couple the SPS-ALE solver with the FSI has been clearly identified within the group.
+* '''Sub-project 3 (Likhitha Ramesh Reddy and Axelle Viré, TU Delft and Pierre Bénard, CORIA):''' The long-term aim of this sub-project is to perform simulations of the flow around floating wind turbines, which constitutes a huge challenge, as it gathers the difficulties of wind tubines flows, two-phase flows, and fluid-structure interactions between a fluid and a solid. During the workshop, the aim was '''to progress on two aspects: the use of the two-phase flow solver of YALES2, SPS, in a moving domain (coupling SPS and ALE) and the coupling with FSI'''. Both tasks were tackled: preliminary validation simulations were performed for the SPS-ALE solver, and the strategy to couple the SPS-ALE solver with the FSI has been clearly identified within the group.
 * '''Common work:''' TU Delft (Sub-project 3) needs to perform FSI without deformation of the structure, so that the coupling with the SMS solver may not be indispensable. Tests were performed to study the ability of the SMS to work in a regime of very stiff material to mimic rigid bodies, and first tests were very convincing. In the future however, it is planned to implement a rigid-body motion solver in YALES2 as an alternative to SMS. This task gathers the four teams of the project and is a clear shared objective of the next months.
 * '''Bugs and cleaning:''' minor bugs were identified in the FSI solver, mostly related to options rarely used. There were corrected and pushed in the YALES2 gitlab.

Extreme CFD workshop