Specific physical models such as dispersed phase, atmospheric flows, gas combustion, pulverized fuel combustion, electric arcs models, and compressible flows can be activated using the GUI (select the Calculation features), or by using the cs_user_model function of the cs_user_parameters.c file (called only during the calculation initialization).
Without the GUI, the user can activate the different modules by setting the indicators cs_glob_physical_model_flag in the cs_user_model function, (see Base model related options examples for some examples)
WARNING: Only one specific physical module can be activated at the same time.
In the framework of the gas combustion modeling, users may impose their own enthalpy-temperature tabulation (conversion law). The use_janaf indicator must be set to 0 in this case (the default value being 1) and the name of the tabulation file defined through the ficfpp variable (see Specific physical model activation (cs_user_model) examples). For more details, the user may refer to the following note (thermochemical files).
The user must not forget to place in the DATA directory the thermochemical file dp_C3P (use_janaf = 1), dp_C3PSJ or dp_ELE (depending on the selected module) Such files can be copied to the DATA directory of a study case using the GUI (see the Tools menu). Their content is described below.
For example, using gas combustion with (use_janaf=1) we can directly copy the dp_C3P file from the GUI.
| Lines | Examples of values | Variables | Observations |
|---|---|---|---|
| 1 | 5 | ngaze | Number of current species |
| 2 | 10 | npo | Number of points for theenthalpy-temperature table |
| 3 | 300. | tmin | Lower temperature limit for the table |
| 4 | 3000. | tmax | Upper temperature limit for the tabulation |
| 5 | Empty line | ||
| 6 | CH4 O2 CO2 H2O N2 | nomcoe(ngaze) | List of the current species |
| 7 | .35 .35 .35 .35 .35 | kabse(ngaze) | Absorption coefficient of the current species |
| 8 | 4 | nato | Number of elemental species |
| 9 10 11 12 | .012 1 0 1 0 0 .001 4 0 0 2 0 .016 0 2 2 1 0 .014 0 0 0 0 2 | wmolat(nato), atgaze(ngaze,nato) | Molar mass of the elemental species (first column) Composition of the current species as a function of the elemental species (ngaze following columns) |
| 13 | 3 | ngazg | Number of global species. Here, ngazg = 3 (Fuel, Oxidiser and Products) |
| 14 15 16 | 1. 0. 0. 0. 0. 0. 1. 0. 0. 3.76 0. 0. 1. 2. 7.52 | compog(ngaze,ngazg) | Composition of the global species as a function of the current species of line 6 In the order: Fuel (line 15), Oxidiser (line 16) and Product (line 17) |
| 17 | 1 | nrgaz | Number of global reactions. Here nrgaz = 1 (always equal to 1in this version) |
| 18 | 1 2 -1 -9.52 10.52 | igfuel(nrgaz), igoxy(nrgaz), stoeg(ngazg,nrgaz) | Numbers of the global species concerned by the stoichiometric ratio (first 2 integers) Stoichiometry in global species reaction. Negative for the reactants (here “Fuel” and “Oxidiser”) and positive for the products (here “Products”) |
if the user provides an enthalpy-temperature tabulation (there must be three chemical species and only one reaction): dp_C3PSJ (see following array). This file replaces dp_C3P.
| Lines | Examples of values | Variables | Observations |
|---|---|---|---|
| 1 | 6 | npo | Number of tabulation points |
| 2 3 4 5 6 7 | 50. -0.32E+07 -0.22E+06 -0.13E+08 250. -0.68E+06 -0.44E+05 -0.13E+08 450. 0.21E+07 0.14E+06 650. 0.50E+07 0.33E+06 -0.12E+08 850. 0.80E+07 0.54E+06 -0.12E+08 1050. 0.11E+08 0.76E+06 -0.11E+08 | th(npo), ehgazg(1,npo), ehgazg(2,npo), ehgazg(3,npo) | Temperature(first column), mass enthalpies of fuel, oxidiser and products (columns 2,3 and 4) from line 2 to line npo+1 |
| 8 | .00219 .1387 .159 | wmolg(1), wmolg(2), wmolg(3) | Molar masses of fuel, oxidiser and products |
| 9 | .11111 | fs(1) | Mixing rate at the stoichiometry (relating to Fuel and Oxidiser) |
| 10 | 0.4 0.5 0.87 | ckabsg(1), ckabsg(2), ckabsg(3) | Absorption coefficients of the fuel, oxidiser and products |
| 11 | 1. 2. | xco2, xh2o | Molar coefficients of CO2 and H2O in the products (using grey body radiation) |
| Lines | Examples of values | Variables | Observations |
|---|---|---|---|
| 1 | # Free format ASCII file ... | Free comment | |
| 2 | # Comment lines ... | Free comment | |
| 3 | #... | Free comment | |
| 4 | # Argon properties ... | Free comment | |
| 5 | # ... | Free comment | |
| 6 | # No of NGAZG and No ... | Free comment | |
| 7 | # NGAZG NPO ... | Free comment | |
| 8 | 1 238 | ngazg npo | Number of species Number of given temperature points for the tabulated physical properties (npo 6 npot set in ppthch) So there will be ngazg blocks of npo lines each |
| 9 | # ... | Free comment | |
| 14 | 0 | ixkabe | Radiation options for xkabe |
| 15 | # ... | Free comment | |
| 16 | # Propreties ... | Free comment | |
| 17 | # T H ... | Free comment | |
| 18 | # Temperature Enthalpy ... | Free comment | |
| 19 | # ... | Free comment | |
| 20 | # K J/kg ... | Free comment | |
| 21 | # ... | Free comment | |
| 22 | # 300. 14000. ... | h roel cpel sigel visel xlabel xkabel | In line tabulation of the physical properties as a function of the temperature in Kelvin for each of the ngazg species Enthalpy in J/kg Density in kg/m3 Specific heat in J/(kg K) Electric conductivity in Ohm/m Dynamic viscosity in kg/(m s) Thermal conductivity in W/(m K) Absorption coefficient (radiation) |
1.14.0 