[limpideyes]

Hello,

I'm trying to extract U data (velocity) from a certain plane. After I ran the simulation, I've got a whole domain from OpenFOAM to ParaView:
Whole domain.jpg

However, I don't need U values for the whole domain. What I need is U value only on the circular plane in red colour as shown below:
plane.jpg

This plane was defined in the SnappyHexMesh:

/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  9
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    format      ascii;
    class       dictionary;
    object      snappyHexMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#includeEtc "caseDicts/mesh/generation/snappyHexMeshDict.cfg"

castellatedMesh on;
snap            on;
addLayers       off;

geometry
{
    buildings
    {
        type triSurfaceMesh;
        file "buildings.stl";
    }

    refinementCylinder
    {
        type searchableCylinder;
	point1          (0 0 0);
	point2          (0 0 190);
	radius          350; 
    }
};

The plane is Z = 1.5m height from the refinementCylinder.

How can I export U value only on the circular plan to the ParaView?

Which code do I have to add in OpenFOAM? Since I am new for OpenFOAM, please help.

Thanks in advance!