The pressureTransmissive boundary condition in OF 1.3 was dropped in OF 1.4 in favor of the waveTransmissive BC. Below is a port of the pressureTransmissive BC to OF 1.4.1 ( does not work with OF 1.4.)
Place in either the directory tree, mimicking the placement of waveTransmissive, or place in the same directory as your custom solver and add pressureTransmissiveFvPatchScalarField.C to the Make/files file. See another BC for an example.
- Further testing.
From this wiki: pressureTransmissive.tgz