CFD model | RIAM-COMPACT | Meteodyn WT |
Turbulence model | Standard Smagorinsky LES | k-L RANS (A single equation model) |
Atmospheric stratification (Atmospheric stability) | Neutral atmosphere | |
Coriolis force | Not considered | |
Surface roughness | Not considered (Smooth surface) | Roughness length: 0.05 (For the ground surface not on the isolated hill: 0.001) |
Ground surface boundary condition | Non-slip condition (Three wind velocity components at the ground surface are zero.) | |
Shape function of the isolated hill z (r) | 0.5h × {1 + cos(πr/a)} r = (x2 + y2)1/2, a = 2h | |
Height of the isolated hill h | 100 (m) | |
Reynolds number Re (=Uinh/ν) | 106 | 107 |
Time step Δt | 10−5 h/Uin (s) | - |
Computational domain size | 19h (i) × 18h (j) × 8h (k) | |
Number of computational grid points | 436 (i) × 325 (j) × 101 (k) (Approx. 14.3 million points) | 436 (i) × 325 (j) × 37 (k) (Approx. 5.2 million points) |
Streamwise (x) grid spacing (Δx) | (0.035 - 0.5) × h | |
Spanwise (y) grid spacing (Δy) | ||
Vertical (z) grid spacing (Δz) | (0.0001 - 0.6) × h | (0.005 - 1.2) × h |