NTMIX:
NTMIX is a tool based on DIRECT NUMERICAL SIMULATION. It allows
to study 3D turbulent flow with combustion effects. NTMIX was born from
a collaboration between EM2C (CNRS, Ecole Centrale Paris), Institut Francais
du Petrole, CERFACS. It will help on scientific studies on combustion phenomena
and applied problems for industry (SNECMA, PEUGEOT, RENAULT ...) both in
aeronautic and automotive fields.
Principle of DNS
Navier-Stokes equations are directly resolved : all the scales are taken into account, no subgrid models, the spatio-temporal dynamic of the turbulence is respected.
The flame front is directly resolved here : no front tracking.
In return, we are limted to low Reynolds and Damkolher numbers.
NTMIX3D solver
It uses finite d it uses=> limited to simple geometry
It has the following characteristics :
-
transport properties, reaction terms
-
Fully compressible Navier-Stokes, with
-
chareristics-based boundary conditions 'NSCBC' (Poinsot et
Lele,1990)
-
high order finite difference : compact scheme sixth order in physical space
(Lele,1992)
-
Explicit RK third order scheme in time
The Combustion model used here
is a single step reaction with an Arrhenius Law
(Westbrook et Dryer, 1981) for C3H8, Unitary Lewis number
and Temperature dependent transport coefficients.
Current areas of interest
Direct Numerical Simulation is useful to CHECK the assumptions used to
build combustion models, compare results to experiments and DEVOPMENTS
of flamelet models for turbulent combustion.
Current areas of interest cover :
DNS and modelling of flame - wall interaction, vortex - wall interaction
DNS and modelling of flame - turbulence interaction
DNS and models for turbulent supersonic combustion
Formation of pollutants in turbulent flames, in aircraft wakes
Two-phase flow combustion
DNS 2D with complex chemistry and transport
Premixed/unpremixed/partially premixed combustion
Recent developments :
Large Eddy Simulation for complex turbulent flows (combustion, wall interaction,
...),
Complex geometry using forcing method,
Injection of turbulence at inflow.
This home page is still under construction. If you
have any problems or any comments, feel free to contact : jerome.helie@ifp.fr