Table 1
Overview of the performed simulations and their results with regard to the extend of moat and wind tail.
| Simulation | Varied parameter | Moat | Wind tail |
|---|---|---|---|
| Reference case | – | Yes | Yes |
| Higher Young’s modulus | Y = 106 Pa | Slightly wider | Unchanged |
| Low friction | μ = 0.1, μr = 0.1, ηr = 0.1 | Wider | Smaller |
| High friction | μ = 2.0, μr = 2.0, ηr = 2.0 | Wider | Smaller |
| Higher tensile strength | R = 3 … 6mm | Smaller | Smaller |
| Larger wind particles | Rwind = 6… 12cm | Irregular | Irregular |
| Spherical obstacle | – | Much smaller | Much smaller |
| Erosion case | – | Smaller | Much Smaller |
Notes. Parameter variations are given with respect to the reference case: rotated cuboid boulder, particles with radii R = 3… 6cm, Young’s modulus Y = 105 Pa, restitution coefficient er = 0.2, triplet of friction coefficients μ/μr/ηr of 1.0/1.0/1.0, cohesive energy density ω = 0.028 J m−2, insertion speed of particle wind vins = 0.5 ms−1.
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