# Main ContribExamples/OscillatingFixedValue

From OpenFOAMWiki

Searching the tutorials I couldn't find an example of how to use this type of boundary condition, so I've created a very small and simple tutorial. Basically, the setup requires the definition of 4 parameters:

inlet { type oscillatingFixedValue; amplitude 0.5; frequency 0.2; refValue uniform (1 0 0); }

The above setup enables to specify a velocity boundary condition for an entire patch that varies in time as:

Sample OpenFOAM case - it applies to **Valid versions:**

Update - it applies to **Valid versions:**

As from OpenFOAM 2.1.x, the dictionary for this boundary condition should read as

myPatch { type oscillatingFixedValue; value uniform 0; // Initialization value refValue uniformrefV; // Reference value for oscillation offsetoffset; // Oscillation mean value offset amplitude constantAmp; // Amplitude of oscillation frequency constantfreq; // frequency }

for a given scalar field. If applied to vector field, value, offset and refValue should be modified accordingly. This dictionary specifies an oscillating boundary condition of a given scalar, for an entire patch, as: