[manoj_nav]

Hi All,

I am trying to calculate mass flow rate at 12 HVAC vents opening. These openings are not defined as patch or face. They are interior of the domain. I want to define plane/rectangle of a give size at these opening locations to calculate the mass flow rate through them. But when I create a plane in paraview using sources > plane, the plane doesn't have nay data field - U or p.
Please help me to calculate mass flow rate at arbitrary plane in the domain. When I use slice or cut plane, it cuts through the whole domain, which I don't want.

Regards,

Manoj

[tomf]

Hi,

If you want to use the plane from sources, you need to do resampleWithDataSet.

I typically use the following sequence of filters: Slice>Connectivity>threshold on the "regionID" (see example images)

Regards,
Tom

[t.oliveira]

Originally Posted by manoj_nav

Hi All,
when I create a plane in paraview using sources > plane, the plane doesn't have nay data field - U or p.

Dear Manoj,

Does the solution have to involve paraview? Can't it be using a functionObject?

Thomas Oliveira

[manoj_nav]

Originally Posted by tomf

Hi,

If you want to use the plane from sources, you need to do resampleWithDataSet.

I typically use the following sequence of filters: Slice>Connectivity>threshold on the "regionID" (see example images)

Regards,
Tom

Thanks Tom. After using resampleWithDataSet, it works.

When I use sequence of filters: Slice>Connectivity .. I get just one region ID - 0, as in the attached snapshot. How to use the threshold then. Sorry for my ignorance..

Regards,

Manoj

[manoj_nav]

Originally Posted by t.oliveira

Dear Manoj,

Does the solution have to involve paraview? Can't it be using a functionObject?

Thomas Oliveira

Thanks Thomas for the reply. How to use functionObject to calculate mass flow rate through an arbitrary plane?

Regards,

Manoj

[manoj_nav]

Originally Posted by t.oliveira

Dear Manoj,

Does the solution have to involve paraview? Can't it be using a functionObject?

Thomas Oliveira

I tried using functionObject. But I am getting following error ,

keyword sourceName is undefined in dictionary "/home/manoj/trial/vent/system/controlDict.functions.new_plane"

functions
{


    new_plane
    {
        type            faceSource;
        functionObjectLibs ("libfieldFunctionObjects.so");
        enabled         true;
        outputControl   outputTime;
        log             true;
        valueOutput     true;
        source          sampledSurface;

        sampledSurfaceDict
        {
         type        sampledTriSurfaceMesh;
         surface     opening.stl;
         source      cells;  // What to sample: cells (nearest cell)
                                    // insideCells (only triangles inside cell)
                                    // boundaryFaces (nearest boundary face)
         interpolate true;
        }

        operation       areaAverage;

        fields
        (
            U
        );
    }
}

I get the same error, when I use packaged function objects

functions
{
  #include "volFlowRateSurface"

}

Please help.

Regards,

Manoj

[tomf]

Originally Posted by manoj_nav

Thanks Tom. After using resampleWithDataSet, it works.

When I use sequence of filters: Slice>Connectivity .. I get just one region ID - 0, as in the attached snapshot. How to use the threshold then. Sorry for my ignorance..

Regards,

Manoj

Hi,

In that case there is no possibility for the threshold filter. I had assumed you would have some distinct regions for each opening, maybe you could make a clear sketch of what you are trying to do.

Regards,
Tom

[t.oliveira]

Originally Posted by manoj_nav

I tried using functionObject. But I am getting following error:
keyword sourceName is undefined in dictionary "/home/manoj/trial/vent/system/controlDict.functions.new_plane

I am sorry Manoj I haven't seen your message before.

Check this post, which offers another way of defining a (infinite) plane that may be useful to you : http://www.cfd-online.com/Forums/ope...tml#post581774


Regarding the error your received, have you tried inserting the keyword sourceName inside the new_plane dictionary, like below? That is what the error message says.

functions
{


    new_plane
    {
        type            faceSource;
        functionObjectLibs ("libfieldFunctionObjects.so");
        enabled         true;
        outputControl   outputTime;
        log             true;
        valueOutput     true;
        source          sampledSurface;
        sourceName      anyNameYouLike;
        ...

Best wishes,
Thomas