Heat transfer and pressure drop characteristics are investigated numerically on tube bundle support plates for inline and staggered arrangements. 3D numerical analyses are performed and validated by comparisons with experimental results. Four different Unsteady Reynolds Averaged Navier-Stokes based turbulence models, namely the realizable k-ε, standard k-ω, SST k-ω and transition SST models are used and compared with each other within an Unsteady RANS formulation. In order to reduce the computational effort, simplifications with respect to the domain definition are applied, which are validated within the framework of preliminary studies for assuring accuracy. A constant inlet temperature and a uniform heat flux on the support plates are applied as thermal boundary conditions. The Reynolds number is varied from 989 to 5550, while keeping the Prandtl number constant at 0.70. The Nusselt number and the pressure drop are obtained as functions of the Reynolds numbers. The effects of tube bundle arrangements on heat transfer and pressure drop are discussed.