ENH: streamLine: user selectable interpolation method

src/postProcessing/functionObjects/field/streamLine/controlDict

@@ -0,0 +1,99 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  2.0.0                                 |
+|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       dictionary;
+    object      controlDict;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+application     icoFoam;
+
+startFrom       startTime;
+
+startTime       0;
+
+stopAt          endTime;
+
+endTime         0.5;
+
+deltaT          0.005;
+
+writeControl    timeStep;
+
+writeInterval   20;
+
+purgeWrite      0;
+
+writeFormat     ascii;
+
+writePrecision  6;
+
+writeCompression off;
+
+timeFormat      general;
+
+timePrecision   6;
+
+runTimeModifiable true;
+
+functions
+{
+    streamLines
+    {
+        type            streamLine;
+
+        // Where to load it from (if not already in solver)
+        functionObjectLibs ("libfieldFunctionObjects.so");
+
+        // Output every
+        outputControl   outputTime;
+        // outputInterval 10;
+
+        setFormat       vtk; //gnuplot; //xmgr; //raw; //jplot;
+
+        // Velocity field to use for tracking.
+        U U;
+
+        // Interpolation method. Default is cellPoint. See sampleDict.
+        //interpolationScheme pointMVC;
+
+        // Tracked forwards (+U) or backwards (-U)
+        trackForward    true;
+
+        // Names of fields to sample. Should contain above velocity field!
+        fields (p U);
+
+        // Steps particles can travel before being removed
+        lifeTime        10000;
+
+        // Number of steps per cell (estimate). Set to 1 to disable subcycling.
+        nSubCycle 5;
+
+        // Cloud name to use
+        cloudName       particleTracks;
+
+        // Seeding method. See the sampleSets in sampleDict.
+        seedSampleSet   uniform;  //cloud;//triSurfaceMeshPointSet;
+
+        uniformCoeffs
+        {
+            type        uniform;
+            axis        x;  //distance;
+
+            start       (-0.0205 0.0001 0.00001);
+            end         (-0.0205 0.0005 0.00001);
+            nPoints     100;
+        }
+    }
+}
+
+
+// ************************************************************************* //