Unsteady slipstream of a train passing through a high-speed railway tunnel with a cave

Abstract The cave is of great importance for the storage equipment and to avoid having workers in tunnel, but it changes tunnel section, leads a change slipstream affects safety trains workers. Re-normalization group (RNG) k-ε turbulence method used investigate induced by single train passing through double-track at 350 km/h. with without compared. components three directions are reported comprehensively. results show that existence tail train. At measurement points before after passes cave, intensity mitigated; as enhanced certain extent. With increasing lateral distance, peak value decreases faster than cave. These findings suggest presence mitigates intensity, special attention should be paid design ancillary facilities, especially their relative location.