26.8 Selecting Gradient Limiters

The default gradient limiter in ANSYS FLUENT is the Standard limiter. Each of the limiters is described in detail in this section in the separate Theory Guide. The gradient limiters are accessible from the Expert tab in the Advanced Solution Controls dialog box.

Solution Controls Advanced...

You can select Standard, Multidimensional, or Differentiable from the Spatial Discretization Limiter Type drop-down list.

Each of these options can also be accessed using the TUI by typing the following command:

solve $\rightarrow$ set $\rightarrow$ slope-limiter-set

Choose from the following options:

Criterion	Type
0	Default(TVD) slope limiter
1	Multidimensional (TVD) slope limiter
2	Differentiable slope limiter

Note that the Default(TVD) slope limiter in the TUI is equivalent to the Standard option in the GUI.

For each of the gradient limiter methods, ANSYS FLUENT provides two limiting directions:

• Cell to Face Limiting is where the limited value of the reconstruction gradient is determined at cell face centers. This is the default method.

• Cell to Cell Limiting is where the limited value of the reconstruction gradient is determined along a scaled line between two adjacent cell centroids. On an orthogonal mesh (or when cell-to-cell direction is parallel to face area direction) this method becomes equivalent to the default cell to face method. For smooth field variation, cell to cell limiting may provide less numerical dissipation on meshes with skewed cells.