Here is a list of projects
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In the framework of this project, numerical simulations of the noise
generation of a jet impinging on a flat plate are analysed, discussed
and validated against measurements in an anechoic wind tunnel. The
research topics contain :
1. Computation of the noise based on steady and unsteady CFD flow
computations done by Robert Bosch GmbH using the commercial code CFX.
Noise is computed with the high order Discontinuous Galerkin (DG) code
of IAG, University Stuttgart, solving the Linearized Euler Equations
(LEE) with source terms, and with the high order continuous Finite
Element code of IRMA, Université Louis Pasteur, Strasbourg, solving the
linear second order wave equation with suitable source terms.
2. Large Eddy Simulation (LES) of the flow problem by Prof. Schneider
using a multi-resolution wavelet algorithm, comparison with the results
obtained with CFX.
3. Critical comparison of the numerical results with noise measurements
obtained in the anechoic wind tunnel of Robert Bosch GmbH.
Participants:
Project leaders:
Prof. Dr. Claus-Dieter Munz, University of Stuttgart
Prof. Dr. Kai Schneider, Université de Provence, Marseille
M. Fischer (Robert Bosch GmbH)
Project members:
Dipl.-Ing. Marco Zucchini (Robert Bosch GmbH)
Dipl.-Ing. Michael Dumbser (IAG, University of Stuttgart)
Dipl.-Math. Sébastien Jund (IRMA, ULP, Strasbourg)
Sponsor:
Robert Bosch GmbH
IAG, University of Stuttgart
IRMA, ULP, Strasbourg
Participants:
P. Comte (IMFS, Strasbourg)
B. Noack (Berlin)
Sponsor:
Participants:
R. Friedrich (München)
D. Juvé (Lyon)
J. Sesterhenn (München)
Sponsor:
Participants:
E. Frénod (Vannes)
C.-D. Munz (Stuttgart)
E. Sonnendrücker (Strasbourg)
Sponsor:
Participants:
C. Cambon( Lyon)
M. Oberlack (Darmstadt)
Sponsor:
Two- and three-dimensional compressible direct numerical simulations (DNS)
of the plane mixing layer considered by Colonius, Lele and Moin (J. Fluid
Mech. 330) for two-dimensional flow evolution are performed for
investigating the influence of base flow parameters and three-dimensionality
on the resulting flow structures and noise generation. Especially, a
simulation at very low Mach number is planned to gain data with the same
code for a quasi-incompressible case, enabling a reliable comparison of the
flow fields with respect to compressibility effects on the acoustic field,
cf. the work of Seo & Moon, AIAA-2003-3270. As for noise control,
sensitivity studies and control in open and closed-loop fashion are
investigated using the adjoint set of equations.
Participants:
Airiau ()
M. Kloker (Stuttgart)
U. Rist (Stuttgart)
Sponsor:
Participants:
P. Comte (Strasbourg)
W. Schröder (Aachen)
M. Meinke (Aachen)
Sponsor:
Participants:
M. Jacob (Lyon)
F. Thiele (Berlin)
Sponsor:
Participants:
N. Adams (München)
G.-H. Cottet
Sponsor:
Participants:
H. Bockhorn (Karlsruhe)
M. Farge (Paris)
K.Schneider (Marseille)
Sponsor:
The objective of the present underlying French-German research project
is the development of urgently required techniques in order to apply
large-eddy simulation (LES) and its derivatives to high Reynolds
number turbulent flows of practical interest. Two main development
strategies are considered:
* appropriate wall models in order to bridge the near-wall region and therefore allow high-Re simulations
* non-zonal hybrid LES-RANS methods which split up the simulation (ideally not the domain) into a RANS part
and an LES part
The basic concept of the hybrid approach is to combine the advantages
of both methods yielding an optimal solution at least for a special
class of flows. A real non-zonal hybrid technique is preferred since
it avoids the predefinition of RANS and LES regions leading to an
approach where the suitable simulation technique is chosen more or
less automatically. Although the idea of combined LES-RANS methods is
not new, a variety of open questions has to be answered. This includes
in particular the demand for appropriate coupling techniques between
LES and RANS, adaptive control mechanisms, and proper SGS/RANS
models. Since approximate wall boundary conditions partially rely on
RANS modeling and the classical wall function is a limiting case of a
RANS model in the near-wall region, both topics of the present
proposal, i.e., wall modeling and LES-RANS coupling, are strongly
interconnected.
In order to investigate the open questions mentioned above, in the
first step it is definitely inevitable to consider some geometrically
simple test cases including pressure-induced flow separation and
subsequent reattachment, e.g. test configuration T2, the flow over
periodic hills. The final objectives of the entire project are, of
course, flow configurations of practical interest including high-Re
cases.
Within the CEMRACS Research Center it is planned to work together on
specific hybrid approaches (e.g. DES, SAS or something similar). The
details will be fixed later in close agreement with all participants.
The objectives are to exchange ideas and experiences made with hybrid
approaches and to learn from each other.
The project is open for external participants.
In case of interest in participation, please send an e-mail to
breuer@lstm.uni-erlangen.
Project leaders:
Michael Breuer (LSTM Erlangen)
Christian Tenaud (LIMSI Orsay)
Michel Visonneau (EC Nantes)
Ganbo Deng (EC Nantes)
Project members:
Benoit Jaffrezic (LSTM Erlangen)
Oussama Chikhaoui (EC Nantes)
Sponsor:
Le couplage des équations de Maxwell - calcul du champ électromagnétique - en 2d cartésien,
2d axisymétrique et 3d, résolues par une méthode d'éléments finis d'arêtes avec les équations
de Vlasov résolues par une méthode PIC - calcul des distributions en espace et
vitesse des particules chargées.
La prise en compte de la relation de continuité champs-courants-charges via une
technique éprouvée et robuste (type Marder).
La visualisation des champs et des particules avec des sorties
adaptéss (utilisation de Open DX).
Project leaders:
Patrick Lacoste (CEA)
E. Sonnendrücker (IRMA, ULP, Strasbourg).
Project members:
Regine Barthelme (IRMA, ULP, Strasbourg)
Pierre Navaro (IRMA, ULP, Strasbourg)
Sponsor:
CEA
Participants:
J. Fröhlich (Karlsruhe)
T. H. Le (Onera, Châtillon)
I. Mary (Onera, Châtillon)
W. Rodi (Karlsruhe)
Sponsor:
Participants:
M. Buffat (Lyon)
S. Jakirlic (Darmstadt)
L. LePenven (Lyon)
C. Tropea (Darmstadt)
Sponsor:
Participants:
C. Brun (Orléans)
M. Manhart (München)
Sponsor:
The purpose of the present project is the development, analysis, and application of a
flexible pseudo-spectral method allowing LES with high accuracy and efficiency
for complex practical turbulent flow problems.
The project work will include the joint implementation of a corresponding
pseudo-spectral code involving adequate dynamic subgrid models and advanced numerical
techniques for the discretization and solution of the governing model equations.
Special emphasis will be given to validation and verification aspects as well as
a quality assurance with respect to numerical accuracy and efficiency.
This will include investigations of basic question regarding the interaction of
LES subgrid scale models with spectral discretizations.
For comparisons results from other projects within the Research Group
as well as results of direct numerical simulations
for basic cases of complex flows inside generic geometries will be considered.
Participants:
P. Bontoux (Marseille)
R. Pasquetti (Nice)
M. Schäfer (Darmstadt)
Project closed for external co-workers.
Sponsor:
Participants:
W. Schröder (Aerodynamics Institute, Aachen)
P. Comte (IMFS, Strasbourg)
Grünewald (EADS)
Sponsor:
Aerodynamics Institute, Aachen University of Technology
IMFS, Strasbourg
EADS
Participants:
W. Schröder (Aachen)
Sponsor:
Aerodynamics Institute, Aachen University of Technology
Lufthansa
Participants:
Project leaders:
C.-D. Munz (IAG, Stuttgart),
E. Sonnendrücker (IRMA, ULP, Strasbourg).
Sponsor:
Participants:
Project leaders:
C.-D. Munz (IAG, Stuttgart)
E. Sonnendrücker (IRMA, ULP, Strasbourg).
Sponsor:
CEA
Participants:
M. Dumbser (IAG, Stuttgart),
C.-D. Munz (IAG, Stuttgart)
Sponsor:
Participants:
B. Afeyan (Pleasanton, USA),
J.-L. Stark (CEA Saclay),
E. Sonnendrücker (Strasbourg)
Sponsor:
CEA
The aim of this project will be to develop a numerical method which
is able to deal with two different space scales. The source term
will be defined on the smaller scale and be localized in the simulation
domain and the acoustic or electromagnetic waves will be propagating
on the larger scale.
The numerical method will be based on an idea of Rappaz and Wagner
using two different finite element spaces for the two-scales. We shall
adapt this idea to the Maxwell and acoustics equations using
Raviart-Thomas-Nedelec finite elements.
Participants:
S. Jund (IRMA, ULP, Strasbourg),
S. Salmon (IRMA, ULP, Strasbourg),
E. Sonnendrücker (IRMA, ULP, Strasbourg)
Sponsor : IRMA
