tutorials/multiphase/interPhaseChangeDyMFoam/propeller: New tutorial

tutorials/multiphase/interPhaseChangeDyMFoam/propeller/system/surfaceFeatureExtractDictDefaults

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+// How to obtain raw features (extractFromFile || extractFromSurface)
+extractionMethod    extractFromSurface;
+
+extractFromSurfaceCoeffs
+{
+    // Mark edges whose adjacent surface normals are at an angle less
+    // than includedAngle as features
+    // - 0  : selects no edges
+    // - 180: selects all edges
+    includedAngle   150;
+}
+
+trimFeatures
+{
+    // Remove features with fewer than the specified number of edges
+    minElem         10;
+}