[souza.emer]

Hello everyone,

I'm very curious about how these authors manage to interchange data between models in Ansys Fluent. Basically, the paper says that run a simulation without considering the combustion effects of the reactions, in order to get distribution on the volume fraction only. Then, they use heterogeneous reactions to get combustion. And finally, they go back to the first model and do the calculation again using the data from the combustion. They used this flow chart to summarize the process.

The part where they mention the two model coupling can see below, as the link for the original paper:

"2.4. Coupling of the raceway formation and coal combustion processes

The coupling of the raceway formation and the coal combustion process
was realized by means of data exchanging. Specifically, the distribution of
the coke particle volume fraction obtained by the raceway formation
model decides the geometric profile of the main combustion region
(i.e., the raceway). On the other hand, the generated additional gaseous
mass and the temperature rising owing to the coal and coke particle combustion
can change the continuity equation and the thermophysical properties
of the gaseous phase used in the raceway formationmodel. The detailed
procedures of data exchange are given as follows.
After the combustion process in the initial raceway shape (obtained
without consideration of the effects of the combustion reactions) was
simulated, the particle mass loss and gaseous temperature were then
stored at each cell of the computational domain.When the raceway formation
processwas simulated once again, the mass loss of coal and coke
particles was treated as an additional source term of the continuity
equation of the gas phase, and the thermophysical properties of the gaseous
phasewere recalculated based on the stored gaseous temperature.
Then an updated coke particle distribution was obtained, which is
equivalent to an updated raceway shape. The simulation of the particle
combustion process was re-carried out using the geometric model that
includes the updated raceway. In this way, the simulation data was exchanged
between the two models. Based on the data exchange, the simulation
of the particle combustion and raceway formation process
continued in an alternated way. This alternated simulation process
would not stop until the differences between the update and the previous
results of the main dimensions of the raceway shape were small
enough. These procedures were realized on the platform of ANSYS–
FLUENT with user-defined functions (UDFs). The detailed steps are
shown in Fig. 2."

Article link:
https://www.sciencedirect.com/scienc...952?via%3Dihub
DOI: 10.1016/j.powtec.2018.09.067

Could someone help me?