This contribution presents numerical data on laminar, steady-state single-phase flow in different Periodic Open Cellular Structures (POCS) and different strut arrangements. The data are derived from numerical simulations employing periodic boundary conditions. Water with constant thermophysical properties is used as the fluid, and a constant solid surface temperature is used as the thermal boundary condition. In addition to the geometric characteristics of the structures, the results include data on pressure drop and mean heat transfer coefficients.