[dasith0001]

Hi Foamers,

this is an issue with topoSet for multiRegion case.

Both topoSet and splitMesh are happy if I define the toposet as follows

    // chamberBtm
    {
        name    chamberBtmCellSet;
        type    cellSet;
        action  new;
        source  cylinderToCell;
    	p1      (0 0 0.523507); //top center
    	p2      (0 0 0.683507); // bottom center
    	radius   0.0290; //0.0295;
        innerRadius 0.0;
    }
	
	{
        name    chamberBtmCellSet;
        type    cellSet;
        action  add;
        source  cylinderToCell;
    	p1      (0 0 0.748507); //top center
    	p2      (0 0 0.683507); // bottom center
    	radius   0.0290; //0.122
        innerRadius 0.0165;
    }
  
    {
        name    chamberBtm;
        type    cellZoneSet;
        action  new;
        source  setToCellZone;
        set     chamberBtmCellSet;
    }

here, the 'action add; cellSet is physically connected to the initial cellZone. This works perfectly fine.

But when I want to have two separate zones categorised as the same region as follows;

    // chamberBtm
    {
        name    chamberBtmCellSet;
        type    cellSet;
        action  new;
        source  cylinderToCell;
    	p1      (0 0 0.523507); //top center
    	p2      (0 0 0.683507); // bottom center
    	radius   0.0290; //0.0295;
        innerRadius 0.0;
    }
	
	{
        name    chamberBtmCellSet;
        type    cellSet;
        action  add;
        source  cylinderToCell;
    	p1      (0 0 0.748507); //top center
    	p2      (0 0 0.70000); // bottom center
    	radius   0.0290; //0.122
        innerRadius 0.0165;
    }
  
    {
        name    chamberBtm;
        type    cellZoneSet;
        action  new;
        source  setToCellZone;
        set     chamberBtmCellSet;
    }

the latter region does not get added into the 'chamberBtm' region.

I cannot understand why two cellZones needs to be in contact to be defined into a single region. Is it because of any boundary conditions ?

Is there way to resolve the issue within the topoSet?
Thank you

[LuckyTran]

A topoSetSource must act on a connected region.

You don't have to use exactly the same phraseology that foam does, but try not to contradict it. You do not have (at least as shown here) two zones in one region, you have two cell sets that you are trying to assign to one zone.

Just create two cellSets and put them to the same cellZoneSet

[dasith0001]

Originally Posted by LuckyTran

A topoSetSource must act on a connected region.

You don't have to use exactly the same phraseology that foam does, but try not to contradict it. You do not have (at least as shown here) two zones in one region, you have two cell sets that you are trying to assign to one zone.

Just create two cellSets and put them to the same cellZoneSet

apologies yes I am trying to assign two cellSets into a one 'zone'

But sorry I do not understand your answer, ''A topoSetSource must act on a connected region.''
Does this mean it is not possible ?

Anyways, following this,
''Just create two cellSets and put them to the same cellZoneSet''
I created two cellSets and tried assign them into cellZoneSet

topoSet stopped complaining that I am trying to assigned a cellSet to a cellZone

Thanks

[LuckyTran]

source cylinderToCell; calls the template topoSetSource

One topoSetSource, named chamberBtmCellSet in your case, can only act on a connected group of cells. That means no disjoint cells per source.

You tried to add a disconnected group of cells to the same source (again chamberBtmCellSet) and hence it is a disallowed operation.

You can create multiple cellSets (chamberBtmCellSet.1 and chamberBtmCellSet.2) which are disconnected and then add them to one zone, that is allowed.

These rules are exactly to prevent people from doing what you attempted to do.