functions { surfaceSampling1 { type surfaces; libs ("libsampledPlaneAverage.so"); enabled true; writeControl outputTime; // The same time control with case data write. interpolationScheme cell; // suggest to use 'cell', which is suitable for various mesh size in the domain. surfaceFormat vtk; fields ( p T ); surfaces ( plane1 { type sampledPlaneSpanwise; // choose class 'spanwiseAverage' to get spanwise averaging. interpolate true; // Must be true, or it just cut the plane do not do spanwise average. planeType pointAndNormal; // method used to specific the cuttingPlane pointAndNormalDict { basePoint (0 0 0.1); // This is the origin point for cut plane and for spanwise average normalVector (1 0 0); // This is the normal vector for cut plane, it must be one of the axis. } nPoints 72; // The sample points, how many data in 360 degree is used to average. spanwiseVector (0 0 1); // The symmetry axis, it is the rotation vector for spanwise average // it must be perpendicular to cut plan normalVector } ); } surfaceSampling2 { type surfaces; libs ("libsampledPlaneAverage.so"); enabled true; writeControl outputTime; // The same time control with case data write. interpolationScheme cell; // suggest to use 'cell', which is suitable for various mesh size in the domain. surfaceFormat vtk; fields ( p T ); surfaces ( plane2 { type sampledPlaneAverage; planeType pointAndNormal; pointAndNormalDict { normal (1 0 0); point (0 0 0); } interpolate	true;	//must be true distance	1E-4;	//interval lineOfSight	false;	// false is average; true is sum } ); } }