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From 18 November 2019 to 22 November 2019

Numerical methods for Large Eddy Simulation

nasri |  

Announced
Deadline for registration: 15 days before the starting date of each training
Duration : 5 days / (35 hours)

Pre-registration

Abstract

This training course allows participants to understand the underlying basics of two-phase reacting Large Eddy Simulation (LES): numerics, boundary conditions, LES closures, two-phase flow and combustion modeling. The version 7.0.2 of AVBP has been used for hands-on since October 2016 to compute both academic and realistic configurations of two-phase reacting compressible flows.

Target participants

This training session is for engineers, physicists, computer scientists and numerical analysts who wish to learn to use LES and to manipulate a CFD code dedicated to LES.

Prerequisites

Unix, Fortran, numerical simulation.

Scientific contact 

Eleonore Riber

Fee

  • Trainees/PhDs/PostDocs : 350 €
  • CERFACS shareholders/CNRS/INRIA : 1000 €
  • Public :2000 €

Program

(Every day from 9h to 17h30)

Day 1:Introduction / Numeric for LES

9:00        Welcome and coffee

9:15       LES of reacting compressible flows – Introduction. The differences between RANS and LES. The codes for Large Eddy Simulation

10:45     How does AVBP work: files – scripts – general organization / Installation on computers, accounts, computer organization

11:30     How does Paraview work

14:00     Numerical schemes needed for LES. Dissipation and dispersion of waves. Implementation of numerical schemes in AVBP

15:00     Hands-on work on computers: measurement of dispersion and dissipation, effect of mesh and scheme for two canonical cases: the convection of two-dimensional vortices and the instability growth of a linear shear layer

Day 2: Boundary conditions

9:00       Boundary conditions in compressible flows: characteristic methods

9:45       Implementations of boundary conditions in AVBP

10:30     Hands-on: simulation of one-dimensional acoustic waves reaching non-reflecting boundaries. Generation of propagating acoustic waves

14:00     Hands-on: manipulation of boundary conditions to mimic reflections or to produce non-reflecting conditions. Application to two-dimensional vortices going through outlet

15:30     Hands-on: manipulation of boundary conditions to deal with walls and corners. Application to two-dimensional straight channel with sudden expansion

Day 3: LES of gaseous turbulent reacting flows

9:00       LES of reacting flows: thermodynamics, kinetics, laminar flames, turbulent combustion model, closure models for LES and wall modelling

10:30     Hands-on: post-processing LES of turbulent pipe flow. Effect of subgrid-scale model, wall model and grid refinement

14:00     Hands-on: simulation of a one-dimensional laminar flame (initial flame file (CANTERA) is provided) with and without flame thickening

16:00     Hands-on: post-processing the LES of a turbulent gaseous swirled propane-air flame

Day 4: LES of two-phase turbulent reacting flows

9:00       LES of two-phase reacting flows: Euler-Euler (EE) and Euler-Lagrange (EL) approaches, evaporation, injection, liquid-wall interactions, two-phase combustion modes

10:30     Hands-on: simulation of two-phase canonical cases using both  EE and EL approaches

14:00     Hands-on: simulation of a one-dimensional two-phase laminar flame

16:00     Hands-on: LES of a n-heptane-air swirled combustor

Day 5: Detailed analysis of LES – spot the difference

9:00       Hands-on: spot the difference on a three-dimensional LES deliberately riddled with errors

14:00     Custom-made afternoon : participants are welcome to discuss about their current objectives/perspecti- ves/problems using AVBP with the senior researchers of the CFD team

Pre-registration

NEWS

Sanderson, B.M., Wobus, C., Mills, D., Zarakas, C., Crimmins, A., Sarofim, M.C. and Weaver, C., Informing future risks of record‐level rainfall in the United States. Geophysical Research Letters.

superadmin |  24 April 2019

The changing risk of extreme precipitation is difficult to project. Events are rare by definition and return periods of heavy precipitation events are often calculated assuming a stationary climate. Furthermore, ensembles of climate model projections are not large enough to fully categorize the...Read more


IMFT and CERFACS win a second ERC (European Research Council) advanced grant in combustion !

superadmin |  3 April 2019

The latest results of the 2018 ERC have been announced: IMFT (Institut de Mécanique des Fluides de Toulouse) and CERFACS have won a second ERC advanced grant in the field of combustion: . This 2.5 Meuro grant will allow to study hydrogen combustion for the storage of renewable energies...Read more

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