An Experiment-Based Simplified Method for the Model of Building Groups in CFD Simulation

Table 3

Simulation settings in ANSYS Fluent.

Grid generation	Unstructured grid; Grid expansion ratio: 1.2; Grid resolution: ≤ 1/10 of each edge of the building
Computational domain	The distance between the building outer boundary and the computational domain edge: ceiling ≥5H, inflow boundary ≥5H, cross-range ≥5H, outflow boundary ≥15H; X ∗ Y ∗ Z: 2000 m ∗ 1500 m ∗ 600 m
Boundary condition	Inflow boundary and ceiling boundary: velocity-inlet— = U10 ∗ (Z/10)^0.3; Outflow boundary: pressure-outlet—101325 Pa; Lateral boundary: symmetry; Ground and building surface: wall
Operation pressure	101325 Pa
Model	Standard k-ε model
Near wall treatment	Enhanced wall functions
Solving algorithms	SIMPLEC