## 7.26.1 Boundary Profile Specification Types

Five types of profiles are provided:

• Point profiles are specified by an unordered set of points: for 2D problems or for 3D problems, where . Profiles written using the Write Profile panel and profiles of experimental data in random order are examples of point profiles.

FLUENT will interpolate the point cloud as needed to obtain values at the boundary faces. The interpolation method for unstructured point data is zero order. In other words, for each cell face at the boundary, the solver uses the value from the profile file located closest to the cell. Therefore, if you wish an accurate specification of an inlet profile, your profile file should contain a sufficiently high point density.

• Line profiles are specified for 2D problems by an ordered set of points: , where . Zero-order interpolation is performed between the points. An example of a line profile is a profile of data obtained from an external program that calculates a boundary-layer profile.

• Mesh profiles are specified for 3D problems by an by mesh of points: , where and . Zero-order interpolation is performed between the points. Examples of mesh profiles are profiles of data from a structured mesh solution and experimental data in a regular array.

• Radial profiles are specified for 2D and 3D problems by an ordered set of points: , where . The data in a radial profile are a function of radius only. Linear interpolation is performed between the points, which must be sorted in ascending order of the field. The axis for the cylindrical coordinate system is determined as follows:

• For 2D problems, it is the -direction vector through (0,0).

• For 2D axisymmetric problems, it is the -direction vector through (0,0).

• For 3D problems involving a swirling fan, it is the fan axis defined in the Fan panel (unless you are using local cylindrical coordinates at the boundary, as described below).

• For 3D problems without a swirling fan, it is the rotation axis of the adjacent fluid zone, as defined in the Fluid panel (unless you are using local cylindrical coordinates at the boundary, as described below).

• For 3D problems in which you are using local cylindrical coordinates to specify conditions at the boundary, it is the axis of the specified local coordinate system.

• Axial profiles are specified for 3D problems by an ordered set of points: , where . The data in an axial profile are a function of the axial direction. Linear interpolation is performed between the points, which must be sorted in ascending order of the field.

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