[Lucky]

I am simulating heat transfer for a porous multiregion heat exchanger. The geometry is highly complex. I have managed to run the simulation with a specific number of cells, i need to do a grid convergence study and each time i try to increase the grid size in blockMeshDict or change refinement levels in snappyHexMesh, i end up getting multiple regions. Instead of three regions, i end up getting more than 20 regions, what could be wrong. I am using openFoam9. Please help