Table Dimensions Reference

Different table dimensions (grid resolution) sub-nodes are available for each flamelet table.

You can specify the grid resolution for a flamelet table using the [Table Generator] > Parameters > [Numerical Settings] > Table Dimensions node.

When trying to reach a flamelet table grid independent solution, you can refine the grid resolution—for adaptive gridding tables you can decrease the tolerance, or for fixed tables you can increase the number of data points—then re-converge the solution until it stops changing.


Flamelet Table Type	Available Table Dimensions
Flamelet Generated Manifold (FGM), (with two streams)	Heat Loss Ratio, Mixture Fraction, Mixture Fraction Variance, Progress Variable, Progress Variable Variance (useful when using Premixed).
Flamelet Generated Manifold (FGM), (with three streams)	Heat Loss Ratio, Mixture Fraction 0, Mixture Fraction Variance 0, Mixture Fraction 1, Mixture Fraction Variance 1, Progress Variable, Progress Variable Variance (useful when using Premixed)
Steady Laminar Flamelet (SLF)	Heat Loss Ratio, Mixture Fraction, Mixture Fraction Variance
Chemical Equilibrium (with two streams)*	Heat Loss Ratio, Mixture Fraction, Mixture Fraction Variance
Chemical Equilibrium (with three streams)*	Heat Loss Ratio, Mixture Fraction 0, Mixture Fraction 1, Mixture Fraction Variance 0, Mixture Fraction Variance 1

*When using the Non-Adiabatic model, the Heat Loss Ratio table dimension is also available to specify.

Mixture Fraction: Data points which represent the mixture fraction, $Z$ . See Mixture Fraction.
Mixture Fraction Variance: Data points which represent the turbulent fluctuations in the local mixture fraction values, $Z_{var}$ .
Progress Variable: Data points which represent the progress of the combustion, $c$ .
Progress Variable Variance: Data points which represent the fluctuations in the progress of the combustion, $c_{var}$ .
Mixture Fraction 0: Data points which represent the stoichiometry of the first stream ratio, $Z_{0}$ .
Mixture Fraction 1: Data points which represent the stoichiometry of the second stream ratio, $Z_{1}$ .
Mixture Fraction Variance 0: Data points which represent the turbulent fluctuations in the mixture fraction values of the first stream, $Z_{0, var}$ .
Mixture Fraction Variance 1: Data points which represent the turbulent fluctuations in the mixture fraction values of the second stream, $Z_{1, var}$ .
Heat Loss Ratio: Data points which represent the heat loss ratio (enthalpy), $γ$ in Eqn. (3520). When using the Inert Stream model, heat losses or gains from the fluid stream are also accounted for. See Inert Streams.

Table Dimensions Properties

Maximum Table Size Estimate: Displays the read-only value for the estimated maximum table size.

Each of the Table Dimension sub-nodes has the following property:

Use Adaptive Number of Grid Points

Allows you to specify if adaptive gridding is used for this table dimension. For more details of how this feature adapts tables, see Flamelet Tables. If the table is populated, the property cannot be changed unless you delete the table.

Activated: Simcenter STAR-CCM+ creates a non-uniform grid for this table dimension by placing table points so that table interpolation is accurate to the tolerance that you specify. You can set the Maximum Number of Grid Points property which appears, along with the interpolation Tolerance property which is used to calculate a normalized tolerance.
Deactivated: You set a specified value of the Number of Grid Points for the table dimension. Simcenter STAR-CCM+ clusters grid points at stochiometric values for the mixture fraction grid, but uses equal spacing for the other dimensions of variance, reaction progress (Progress Variable) and enthalpy (Heat Loss Ratio).

Note	When the Maximum Number of Grid Points for Mixture Fraction Variance and Progress Variable Variance is set to a value greater than 1, the transport equation is solved.