CFD Simulations AC2-09

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SANDIA Flame D

Application Challenge AC2-09   © copyright ERCOFTAC 2024

Overview of CFD Simulations

SIMULATION CASE CFD1

Application of Physical Models

In the most general case modeling of the combustion processes is very expensive computationally since together with the solution of the flow field it requires solution of additional transport equations for particular N species (e.g. CO, CO₂, H₂O, H₂, etc.) produced in chemical reactions. The transport equations for species have the following form:

${\frac {\partial \rho Y_{k}}{\partial t}}+{\frac {\partial \rho u_{i}Y_{k}}{\partial x_{i}}}={\frac {\partial }{\partial x_{i}}}\left(\rho D_{k}{\frac {\partial Y_{k}}{\partial x_{i}}}\right)+{\dot {\omega _{k}}}\quad k=1,2,\dots ,N\qquad (1)$

where

$\rho$	is the density
$u_{i}$	is the velocity component
$Y_{k}$	is the mass fraction of species $k$
${\dot {\omega _{k}}}$	is the reaction rate (speed of creation/destruction of a given species)
$D_{k}$	is the diffusion coefficient usually taken the same (denoted by $D$) for each species and defined as $\rho D=\mu /Pr$, where $\mu$ is the molecular viscosity and $Pr$ is the Prandtl number.

SIMULATION CASE CFD2

(as per CFD 1)

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Contributed by: Andrzej Boguslawski — Technical University of Częstochowa

Front Page

Description

Test Data

CFD Simulations

Evaluation

Best Practice Advice

© copyright ERCOFTAC 2024