The default gradient limiter in Ansys Fluent is the Standard limiter. Each of the limiters is described in detail in Gradient Limiters in the 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 by typing the following text command:
solve → set →
slope-limiter-menu
The type of slope limiter changed by selecting the menu item
type and by choosing one of the following options:
default, multi-dimensional, and
differentiable. Note that the
default slope limiter in the TUI is equivalent to the
Standard option in the GUI.
For each of the gradient limiter methods, Ansys Fluent provides three limiting directions:
Cell to Face Limiting - the limited value of the reconstruction gradient is determined at cell face centers. This is the default method.
Cell to Cell Limiting - 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.
Cell to Node Limiting - the limited value of the reconstruction gradient is determined at the vertices of a cell. This limiting direction is more conservative than the default cell to face strategy, leading to improved monotonicity and robustness when computing strong gradients on unstructured grids. It is particularly advantageous for meshes containing stretched, skewed, or high aspect-ratio cells.
Note: The Cell to Node Limiting direction is not available for
overset meshes, or when using the multi-dimensional
limiter.
Ansys Fluent also provides the option to apply a limiter filter to the Standard and Differentiable limiters. The purpose of the limiter filter is to maintain higher-order accuracy for the main flow variables. It suppresses limiter intervention arising from small numerical noise, while maintaining limiter control when there are actual discontinuities or large gradients in the solution (at shocks, boundary layers, and so on). The limiter filter can also help in improving the apparent convergence of the solution residual.
To use the limiter filter enable Apply Limiter Filter. When the limiter filter is turned on, then by default the filter mechanism is applied to the main flow and turbulent variables only. The filter mechanism is based on comparing local cell changes to average global domain changes of a particular flow variable. When the local changes are very small compared to the average global changes, then the limiter intervention will be suppressed.
Note: The limiter filter is not available when using the Multidimensional limiter.