Initialization of the variables

For Reactive flows (combustion), it is possible to initialize the specific variables in the Graphical User Interface (GUI) or in the cs_user_initialization function.

In the GUI, when a Reactive flows (combustion) is selected in the item “Calculation features”, an additional item appears: “Gas combustion” the user can change it by “Pulverized coal”. In this item the user can define coal types, their composition, the oxidant and reactions parameters, see the following figure.

Thermophysical models - Pulverized coal, coal model

Thermophysical models - Pulverized coal, coal classes

Pulverized coal combustion, coal composition

Pulverized coal combustion, reaction parameters

Pulverized coal combustion, oxydant

If the user activates gas combustion and does not want to use the GUI, she or he can directly use the cs_user_initialization function (for some examples see Initialization examples).

Boundary conditions

For pulverized coal, it is possible to manage the boundary conditions in the Graphical User Interface (GUI). When the boundary zones is actived, the user specific boundary conditions are activated for inlets

Boundary conditions for the pulverized coal module

For gas combustion it is also possible to manage the boundary conditions for the inlet in the Graphical User Interface (GUI). The user can choose between the burned gas or the Unburned gas, impose the the mass flow and velocity

Boundary conditions for gas combustion

Initialization of the options of the variables

In the case of gas combustion or pulverized coal combustion, time averages, chronological records and log follow-ups can be set in GUI or in the cs_user_parameters function. In the GUI, under the heading Calculation control, additional variables appear in the list in the items Time averages and Profiles, as well as in the item Volume solution control

Calculation control - Time averages

Calculation control - Volume solution control

For gas combustion, if the GUI is not used for coal combustion, the cs_user_parameters and cs_user_combustion functions, called at calculation start, can be used to:

set the relaxation coefficient of the density srrom.
set the dynamic viscosity diftl0.
set the value of the constant cebu of the Eddy Break Up model (only in cs_user_combustion).