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In this short clip, we walk through how to correctly define and apply a cellSet and convert it into a cellZone in OpenFOAM. We discuss the importance of syntax (like adding a semicolon), creating a cell set named topLayerCells, and assigning it as a source zone. You’ll also see how to convert the cell set to VTK format for visualization and inspect the geometry inside ParaView. This step is useful when you want to apply boundary conditions, source terms, or region-specific operations in your CFD case. #OpenFOAM #CFD #ComputationalFluidDynamics #ParaView #CFDTutorial #EngineeringSimulation #MeshGeneration #CFDLearning #Simulation #CFDEngineering #OpenSourceCFD #VTK #CellZone #CFDTraining