Dataset of LES turbulent inflow boundary conditions for the AIJ benchmark actual-urban case (Case-E, Niigata City, Japan)

This data article presents a dataset of turbulent inflow boundary conditions generated using a precursor large-eddy simulation (LES) for an actual urban case (Niigata City, Japan) from the Architectural Institute of Japan (AIJ) benchmark (Case-E). The precursor simulation reproduces the wind-tunnel roughness elements, including spires and cubic blocks, to ensure consistency with the benchmark wind-tunnel experiment (WTE). The simulation is conducted in OpenFOAM v2106 using a poly hex-core mesh with approximately 8.7 million cells. Time-resolved inflow data are extracted from a designated storage plane for 30 s. The dataset provides validated turbulent inflow boundary conditions that can be directly applied to urban large-eddy simulations. It is intended to support studies on urban wind environment modeling, numerical method validation, and comparative assessments of CFD approaches.