Using the BC option

This page describes how to use the BC option to specify boundary conditions at boundary edges of the surface mesh.

Here is an example of a dictionary that can be used with BC:

"BC": {1: {"iLow": "ySymm"}, 3: {"jHigh": "splay", "iHigh": "xConst"}}

Each entry in the dictionary has a key and at least one nested key-value pair. The key is the 1-based block number, the nested key is the boundary edge specification, and the value is the boundary condition. For the first entry, these are 1, iLow, and ySymm, respectively.

The 1-based block number and boundary edge specification for a boundary edge can be determined using Tecplot:

  1. Load the surface mesh file into Tecplot.

  2. Use the Probe tool to select a point on the boundary edge of interest. Use Ctrl+click to snap on to a boundary edge.

  3. Select Zone/Cell Info in the toolbar on the right.

  4. The number shown after Zone is the 1-based block number.

  5. The edge specification depends on the values of I and J. The edge is iLow if I=1, iHigh if I=I-Max, jLow if J=1, or jHigh if J=J-Max. Only one of these is true for any boundary edge.

The supported boundary conditions are:

  • splay for free edges

  • xSymm, ySymm, zSymm for symmetry planes

  • xConst, yConst, zConst, xyConst, yzConst, xzConst for constant planes