Quasi periodic large scale vortex structure is an important phenomenon in rod-bundle-like lattice, which also plays an important role in the local flow and heat transfer around bundles. In this work, the heat transfer and vortex structure in sparse lattice with non-uniform wall roughness are investigated with the unsteady Reynolds-Averaged Navier-Stokes (URANS) simulation with a Reynolds Stress Model (RSM) in FLUENT 6.3. The pitch to diameter ratio (P/D) of the sparse lattice is 1.12. It is found that the transverse flow mixing, heat transfer and the vortex structure are enhanced with the wall roughness increasing.

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