Difference between revisions of "Main ContribExamples/OscillatingFixedValue"
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(Update of oscillatingFixedValue bounday condition, in accordance with latest definition in OpenFOAM 2.1.1) |
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[[Media:bcOscilating.tar.gz|Sample OpenFOAM case]] - it applies to {{VersionInfo}}{{Version1.5}} | [[Media:bcOscilating.tar.gz|Sample OpenFOAM case]] - it applies to {{VersionInfo}}{{Version1.5}} | ||
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+ | As from OpenFOAM 2.1.x, the dictionary for boundary condition should read, for a scalar field for instance, | ||
+ | myPatch | ||
+ | { | ||
+ | type oscillatingFixedValue; | ||
+ | value uniform 0; // Initialization value | ||
+ | refValue uniform ''refV''; // Reference value for oscillation | ||
+ | offset ''offset''; // Oscillation mean value offset | ||
+ | amplitude constant ''Amp''; // Amplitude of oscillation | ||
+ | frequency constant ''freq''; // frequency | ||
+ | } | ||
+ | which specifies an oscillating boundary condition, for an entire patch, as: | ||
+ | |||
+ | <math> \textrm{\textit{refV}} \cdot \left( 1.0 + \textrm{\textit{Amp}} \cdot \sin \left(2\pi\cdot \textrm{\textit{freq}}\cdot t\right)\right) + \textrm{\textit{offset}}</math> |
Revision as of 23:53, 28 January 2013
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:
As from OpenFOAM 2.1.x, the dictionary for boundary condition should read, for a scalar field for instance,
myPatch { type oscillatingFixedValue; value uniform 0; // Initialization value refValue uniform refV; // Reference value for oscillation offset offset; // Oscillation mean value offset amplitude constant Amp; // Amplitude of oscillation frequency constant freq; // frequency }
which specifies an oscillating boundary condition, for an entire patch, as: