Study on Re-Independence of Flow Structure in a Flat Large-Space

Locomotive inspection and repair shed and underground garage belong to typical flat large-space on which there are few studies about Reynolds number independence (Re-independence). In order to provide theoretical basis of scale experiment for such subjects, in this paper, a 1:40 reduced scale models of a flat large-space are numerically established, and Re-independence of flow pattern are investigated using a Computational Fluid Dynamic (CFD) method. The main content includes: (1) Based on the reduced scale model, the vertical profiles of dimensionless velocity are compared with Reynolds number increased from 85 to 12,750. (2) A dimensionless number, relative change rate of velocity (RCRV), and a criterion of RCRV less than 5% are proposed to quantitatively calculate critical Reynolds number (Recrit). The results show that the suggested Recrit of the flat large-space studied is 5950.