Difference between revisions of "SiTCom-B Gallery"

Revision as of 10:28, 6 November 2012

LES of a Trapped Vortex Combustor

Immersed boundaries are used to optimize the geometry of a trapped vortex combustor

Geometry of the Trapped Vortex Combustion chamber	Q-critrion - Visualisation of the turbulent flow topology	Comparison against experiments

• C. Merlin, P. Domingo, L. Vervisch Large Eddy Simulation of turbulent flames in a Trapped Vortex Combustor (TVC) - A flamelet presumed-pdf closure preserving laminar flame speed, Comptes Rendus Mecanique, Out of Equilibrium Dynamics issue, in press.

Immersed boundaries in LES of compressible flows

Immersed boundaries are developed for fully compressible simulations

Pressure wave reflection on inclined walls	Transonic cavity flow simulation	Comparison of pressure spectra against measurements

• C. Merlin, P. Domingo, L. Vervisch Immersed Boundaries in Large Eddy Simulation of Compressible Flows, Flow Turbulence and Combustion, DOI 10.1007/s10494-012-9421-0

DNS of a Rapid Compression Machine

Analysis of ignition regimes after rapid compression - Homogeneous mixture stratified in temperature

Flow injection sequence - Resolution of ${\displaystyle 20\mu m}$	Ignition patterns	Regime Diagram

• G. Lodier, C. Merlin, P. Domingo, L. Vervisch, F. Ravet (2012) Self-ignition scenarios after rapid compression of a turbulent mixture weakly-stratified in temperature, Combust. Flame 159(11): 3358-3371.

Mixing time-history effects: Flow-Controlled Chemistry Tabulation

Analysis of time-history of turbulent mixing and fully new approach to turbulent combustion modeling

FCCT procedure	Dynamic construction of advanced chemistry tabulation	Turbulent flame response to micro-mixing history

• N. Enjalbert, P. Domingo, L. Vervisch, F. Ravet (2012) Mixing time-history effects in Large Eddy Simulation of non-premixed turbulent flames: Flow-Controlled Chemistry Tabulation, Combust. Flame 159(1): 336-352.

DNS of a non-reacting HIT

This is a very simple DNS computation of a HIT with a constant-properties gas.
The main parameters of the simulation are:

• temporal integration: RK3,
• spatial scheme: 4th order skew symmetric
• no AV.

In this series of computations, the number of cell is increased from 64^3 to 256^3.

HIT on increasing number of cells. The displayed field is ${\displaystyle \nabla \wedge U}$

${\displaystyle N_{c}=64^{3}\quad Re_{t}=40}$	${\displaystyle N_{c}=128^{3}\quad Re_{t}=100}$	${\displaystyle N_{c}=256^{3}\quad Re_{t}=250}$

DNS of a non-reacting supercritical mixing layer

This simulation is a DNS of a HIT non-reacting supercritical mixing layer with real-gas properties (equation of state, thermodynamic laws and transport laws).
The main parameters of the simulation are:

• temporal integration: RK3,
• spatial scheme: 4th order skew symmetric
• 2D / Periodic in all directions
• 3.2 Million cells
• EOS: Soave-Redlich-Kwong.
• Transport laws: Chung et al.

The fields that are displayed are:

• up : the density which varies from 80 kg/m3 in the cold stream to 800 kg/m3 in the hot stream.
• down : the mixness ratio which varies from 0 in pure constitutents to 1 for perfect mixness.

Media:supercritical_mixing_layer_mix.avi

This video shows the temporal evolution of mixness ratio during the simulation.
Warning:

• no Artificial Viscosity was used and the mesh was slightly too coarse: a few "wiggles" are visible from time to time near the steepest gradients...
• this video is best visualized with VLC.

Flame base stabilization in vitiated partially-premixed mixture

• P. Domingo, L. Vervisch, D. Veynante (2008) Large-Eddy Simulation of a lifted methane jet flame in a vitiated coflow Combust. Flame 152(3): 415-432.

Electric field and edge-flame

• M. Belhi, P. Domingo, P. Vervisch (2010) Direct numerical simulation of the effect of an electric field on flame stability Combust. Flame 157 2286–2297.

NSCBC vs 3D-NSCBC in jets

• G. Lodato, P. Domingo, L. Vervisch (2008) Three-dimensional boundary conditions for Direct and Large-Eddy Simulation of compressible flows J. of Comp. Phys. 227(10): 5105-5143.

Impinging round jets

Wall/jet interaction ]]

• G. Lodato, L. Vervisch, P. Domingo (2009) A compressible wall-adapting similarity mixed model for large-eddy simulation of the impinging round jet Phys. Fluids 21:035102.

Ignition of a bluff-body burner

• V. Subramanian, P. Domingo, L. Vervisch (2010) Large-Eddy Simulation of forced ignition of an annular bluff-body burner Combust. Flame 157(3): 579-601.

Bunsen flame

• G. Lodato, P. Domingo, L. Vervisch, D. Veynante (2009) Scalar variances: LES against measurements and mesh optimization criterion; scalar gradient: a three-dimensional estimation from planar measurements using DNS In Studying turbulence by using numerical simulation databases XII, (Eds Center for Turbulence Research) Stanford, pp. 387-398

Jet flame-surface

• L. Vervisch, P. Domingo, G. Lodato, D. Veynante (2010) Scalar energy fluctuations in Large-Eddy Simulation of turbulent flames: Statistical budgets and mesh quality criterion Combust. Flame 157(4): 778-789.
• D. Veynante, G. Lodato, P. Domingo, L. Vervisch, E. R. Hawkes (2010) Estimation of three-dimensional flame surface densities from planar images in turbulent premixed combustion Exp. in Fluids 49:267-278.

Nonpremixed jet flame

• G. Godel, P. Domingo, L. Vervisch (2009) Tabulation of NOx chemistry for Large-Eddy Simulation of non-premixed turbulent flames Proc. Combust. Inst. 32: 1555-1551.