randomProcessFixedValue

This is an OpenFOAM boundary condition for generating random gusts at a velocity inlet.

This is a work in progress. Expect breaking changes.

Usage

The random gust is generated using the Spectral Representation Method from a specified power spectral density (PSD). At the moment, this boundary condition can generate a horizontal/vertical spatially uniform random gust.

The following parameters are used to specify the gust:

• gustDir: a vector representing the direction of the gust
• scaleFac: a scaling factor for the amplitude of the gust
• circFreq: a list of frequencies at which the PSD is given
• psd: a list representing the PSD at each frequency in circFreq

Example

Two example cases are provided in the run directory:

• rectangularCavity: A rectangular cavity with a velocity inlet
• rectangularCavityPar: Same rectangular cavity modified to run in parallel

Please have a look at the 0/U file to understand how the gust is to be specified.