Difference between revisions of "OpenFOAM guide/Interpolation (OpenFOAM)"

Revision as of 14:29, 30 June 2010

This article is about Interpolation in OpenFOAM. For other uses, see Interpolation (disambiguation).

OpenFOAM has a number of interpolation methods available. Some are classes that exist for the purpose of interpolation, such as interpolateXY; whereas others use interpolation in their code, such as specieThermo.

1 Main OpenFOAM library

Interpolation available in the main OpenFOAM library includes:

GGIInterpolation (for General Grid Interfaces, OpenFOAM-extend only);
interpolateXY (X-Y function interpolation);
interpolationTable (temporal interpolation);
patchToPatchInterpolation (for multi-region domains, OpenFOAM-extend only);
primitivePatchInterpolation (spatial interpolation between points, faces and edges for a primitive mesh);
RBFInterpolation (used by the Radial Bias Function mesh motion solver, OpenFOAM-extend only);

2 finiteVolume library

Interpolation available in the finiteVolume library includes:

interpolation (by cell) - interpolation to an arbitrary positions within a specified cell, used by:
- Lagrange particle tracking (member of solidParticle); and
- sampling (used in meshToMeshInterpolation);
surfaceInterpolation - interpolate volume field to face field;
- $\left . \phi \right \vert_{v\to f}$
- code: fvc::interpolate(phi);
pointVolInterpolation - interpolate point field to volume field;
volPointInterpolation - interpolate volume field to point field;

The last two are an extension of primitivePatchInterpolation to finite volume: a primitive mesh does not have cell centres.

3 sampling library

Interpolation available in the sampling library includes meshToMesh interpolation.

4 Other interpolation

Other forms of interpolation exist in OpenFOAM, such as:

in the finiteArea library - for finiteArea discretization;
in the tetDecompositionFiniteElement library - for finite element discretization; and
in specieThermo, for interpolating thermodynamic properties to curves.

@@ Line 18: / Line 18: @@
 ** Lagrange particle tracking (member of solidParticle); and
 ** sampling (used in meshToMeshInterpolation);
-* [[surfaceInterpolation]] - interpolate [[volume field]] to [[face field]];
+* [[surfaceInterpolation]] - interpolate volume field to face field;
 ** <math>\left . \phi \right \vert_{v\to f}</math>
 ** code: <tt>fvc::interpolate(phi);</tt>
-* [[pointVolInterpolation]] - interpolate [[point field]] to [[volume field]];
+* [[pointVolInterpolation]] - interpolate point field to volume field;
-* [[volPointInterpolation]] - interpolate [[volume field]] to [[point field]];
+* [[volPointInterpolation]] - interpolate volume field to point field;
 The last two are an extension of [[primitivePatchInterpolation]] to finite volume: a primitive mesh does not have cell centres.