| name | fe-analyst-environmental-load-summary |
| description | Sub-skill of fe-analyst: Environmental Load Summary (+1). |
| version | 1.0.0 |
| category | engineering |
| type | reference |
| scripts_exempt | true |
Environmental Load Summary (+1)
Environmental Load Summary
Loads:
โโโ Gravity
โ โโโ g = 9.81 m/sยฒ; direction: โZ (downward)
โ
โโโ Hydrodynamic (Morison Equation)
โ โโโ Drag coefficient Cd (normal) โ API RP 2RD typical: 1.0โ1.2
โ โโโ Inertia coefficient Cm = 1 + Ca โ typical Ca = 1.0
โ โโโ Lift coefficient Cl (VIV suppression: 0.0 without analysis)
โ โโโ Added mass coefficient Ca (transverse and axial)
โ
โโโ Wave Loading
โ โโโ Wave theory: Airy (linear), Stokes 5th, Dean Stream
โ โโโ Sea state: Hs [m], Tp [s], ฮณ (JONSWAP peak factor)
โ โโโ Heading: ฮธ_wave [ยฐ from North or from vessel heading]
โ โโโ Direction spread: long-crested or short-crested
โ
โโโ Current
โ โโโ Profile: u(z) vs. depth [m/s at each depth]
โ โโโ Heading: ฮธ_current [ยฐ]
โ โโโ Type: Gulf Stream, tidal, mean loop current
โ
โโโ Wind (for surface-piercing structures)
โ โโโ Speed: U10 [m/s] (10-min mean at 10m elevation)
โ โโโ Heading: ฮธ_wind [ยฐ]
โ โโโ Applicable: turret mooring, topsides drag
โ
โโโ Functional Loads
โโโ Internal pressure: Pi [MPa] (operating vs. design)
โโโ Temperature: T [ยฐC] (thermal expansion driving force)
โโโ Lay tension: Th [kN] (installation)
โโโ Pre-tension: T_initial [kN] (mooring chains)
Load Combinations (Design Cases)
| Case | Wave | Current | Wind | Notes |
|---|
| Operating | 100-yr Hs, Tp | 10-yr | 10-yr | Strength check |
| Extreme | 100-yr Hs, Tp | 100-yr | 100-yr | Combined extreme |
| Fatigue | Scatter diagram | Long-term | N/A | Fatigue damage |
| Survival | 10,000-yr | โ | โ | Mooring intact check |
| Installation | Workability Hs | โ | โ | Operability window |