Orcaflex Mooring Iteration

When to Use

• Achieving target mooring line pretensions
• Optimizing line lengths for design loads
• CALM/SALM buoy mooring configuration
• Spread mooring system design
• Turret mooring optimization
• Multi-line tension balancing
• Mooring system verification

Prerequisites

• OrcaFlex license (for simulation)
• Python environment with digitalmodel package installed
• Initial mooring model (close to target configuration)
• Target pretensions for each line

Python API

Basic Usage

from digitalmodel.orcaflex.mooring_tension_iteration import (
    MooringTensionIterator,
    IterationConfig,
    LineConfig,
    ConvergenceConfig
)

# Define configuration
config = IterationConfig(

*See sub-skills for full details.*
### With Vessel Fixing

```python
from digitalmodel.orcaflex.mooring_tension_iteration import (
    MooringTensionIterator,
    IterationConfig,
    VesselConfig
)

config = IterationConfig(
    method="scipy",
    vessel_config=VesselConfig(

*See sub-skills for full details.*
### Convergence Monitoring

```python
# After iteration
result = iterator.iterate_to_targets()

# Access convergence history
for i, error in enumerate(result.convergence_history):
    print(f"Iteration {i+1}: Max error = {error:.2f}%")

# Plot convergence
import matplotlib.pyplot as plt

*See sub-skills for full details.*
### Generate Report

```python
# Generate comprehensive report
report = iterator.generate_report(output_path="iteration_report.txt")
print(report)

# Report includes:
# - Configuration summary
# - Target vs achieved tensions
# - Length modifications
# - Convergence history

Related Skills

• orcaflex-modeling - Run OrcaFlex simulations
• mooring-design - Design mooring systems
• orcaflex-line-wizard - Configure line properties
• catenary-riser - Catenary analysis

References

• OrcaFlex Line Setup Wizard: Orcina Documentation
• API RP 2SK: Design and Analysis of Stationkeeping Systems
• DNV-OS-E301: Position Mooring
• Source: src/digitalmodel/modules/orcaflex/mooring_tension_iteration/
• Tests: tests/modules/orcaflex/mooring-tension-iteration/

Sub-Skills

• Basic Configuration (+1)
• Initial Model (+2)

Sub-Skills

• Error Handling

Sub-Skills

• Version Metadata
• [1.0.0] - 2026-01-17
• 1. Scipy Optimization (Recommended) (+2)
• Scipy Method (+2)
• Iteration Result (+1)
• With Mooring Design (+1)