OrcaFlex Model Generator Skill

ABOUTME: Generate complete OrcaFlex models using component assembly approach - build models from pre-validated components (vessels, lines, materials, environments) via lookup tables instead of manually editing template files.

---

Version Metadata

version: 1.0.0
python_min_version: '3.10'
dependencies:
  orcaflex-file-conversion: '>=1.0.0,<2.0.0'
orcaflex_version: '>=11.0'
compatibility:
  tested_python:
  - '3.10'
  - '3.11'
  - '3.12'
  - '3.13'
  os:
  - Windows
  - Linux
  - macOS

Changelog

[1.0.0] - 2026-01-07

Added:

• Initial version metadata and dependency management
• Semantic versioning support
• Compatibility information for Python 3.10-3.13

Changed:

• Enhanced skill documentation structure

Overview

This skill provides template-based OrcaFlex model generation using a component assembly approach. Instead of manually editing model files, you configure models by selecting pre-validated components from lookup tables.

Key Capabilities

• ✅ Component Assembly: Build models from modular, reusable components
• ✅ Lookup Tables: Pre-defined vessels, lines, materials, environments
• ✅ Simple Configuration: YAML-based with minimal parameters
• ✅ Comprehensive Templates: Risers, pipelines, umbilicals, moorings, installations
• ✅ Validated: All components meet engineering standards (DNV, API, ISO)
• ✅ Integrated: Works with converter, runner, post-processor

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When to Use This Skill

Use this skill when you need to:

1. Generate Standard Models: Create OrcaFlex models for risers, pipelines, umbilicals
2. Parametric Studies: Generate multiple models with varying parameters
3. Quick Feasibility: Rapidly create models for initial assessments
4. Project Kickstart: Start new projects with proven configurations
5. Training: Learn OrcaFlex modeling with validated templates
6. Design Optimization: Test multiple configurations efficiently

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Quick Start

1. List Available Components

from digitalmodel.modules.orcaflex.model_generator import OrcaFlexModelGenerator

generator = OrcaFlexModelGenerator()

# List vessels
vessels = generator.list_components("vessels")
print(f"Available vessels: {vessels}")
# Output: ['FPSO_P50', 'FPSO_P70', 'Drillship_DP3', ...]

# List risers
risers = generator.list_components("lines/risers")
print(f"Available risers: {risers}")
# Output: ['SCR_10inch_X65', 'SCR_12inch_X65', 'LWR_12inch', ...]

# List environments
envs = generator.list_components("environment")
print(f"Available environments: {envs}")
# Output: ['GoM_100yr', 'GoM_10yr', 'NorthSea_100yr', ...]

2. View Component Details

# Get vessel specifications
vessel_spec = generator.get_component("vessels", "FPSO_P50")
print(f"FPSO P50 Length: {vessel_spec['LOA']}m")
print(f"Displacement: {vessel_spec['Displacement']}t")

# Get riser specifications
riser_spec = generator.get_component("lines/risers", "SCR_10inch_X65")
print(f"OD: {riser_spec['OD']}m")
print(f"Wall Thickness: {riser_spec['WallThickness']}m")
print(f"Material: {riser_spec['Material']}")

3. Create Configuration

# my_scr_config.yml
model:
  type: "scr_catenary"
  name: "GoM_SCR_Analysis_001"

vessel:
  lookup: "FPSO_P50"          # From component library
  position: {x: 0, y: 0, z: 0}

riser:
  lookup: "SCR_10inch_X65"    # From component library
  length: 1500
  segments: 150

environment:
  lookup: "GoM_100yr"         # From component library
  water_depth: 1200

analysis:
  type: "dynamic"
  duration: 10800
  time_step: 0.1

4. Generate Model

# Generate model
model = generator.generate_from_template(
    template="risers/scr_catenary",
    config="my_scr_config.yml",
    output="my_scr_model.yml"
)

# Validate
validation = generator.validate(model)
if validation['is_valid']:
    print("✅ Model is valid")
else:
    print("❌ Validation errors:", validation['errors'])

---

Available Templates

Risers (High Priority - Implemented)

Template	Description	Status
risers/scr_catenary	Steel Catenary Riser	✅ Ready
risers/ttr_top_tensioned	Top-Tensioned Riser	📋 Planned
risers/lazy_wave	Lazy Wave Riser	📋 Planned
risers/pliant_wave	Pliant Wave Riser	📋 Planned
risers/hybrid_riser	Hybrid Riser System	📋 Planned

Pipeline Installation (High Priority - Planned)

Template	Description	Status
pipeline_installation/s_lay	S-Lay Method	📋 Planned
pipeline_installation/j_lay	J-Lay Method	📋 Planned
pipeline_installation/reel_lay	Reel-Lay Method	📋 Planned
pipeline_installation/tow_installation	Pipeline Tow & Pull-in	📋 Planned

Umbilical Installation (High Priority - Planned)

Template	Description	Status
umbilical_installation/static_installation	Static Umbilical	📋 Planned
umbilical_installation/dynamic_umbilical	Dynamic Umbilical	📋 Planned
umbilical_installation/bundle_installation	Umbilical Bundle	📋 Planned

Additional Categories

• Mooring Systems: CALM, SALM, spread, turret, single point
• Structure Installation: Jacket, topside, subsea, manifold
• Towing Operations: Platform, pipeline, barge
• Heavy Lift: Dual crane, subsea, tandem
• ROV Operations: Inspection, intervention, construction
• Specialized: Riser pull-in, flexjoint, touchdown, VIV

---

Component Library

Vessels

Location: docs/modules/orcaflex/templates/components/vessels/

Component ID	Type	LOA (m)	Displacement (t)	Description
FPSO_P50	FPSO	300	200,000	Standard FPSO deepwater
FPSO_P70	FPSO	320	250,000	Large FPSO ultra-deepwater
FPSO_P30	FPSO	270	150,000	Compact FPSO shallow water
DS_DP3_7GEN	Drillship	228	90,000	7th gen DP3 drillship
PLV_SLAY_LARGE	Pipelay	185	45,000	Large S-lay vessel

Risers

Location: docs/modules/orcaflex/templates/components/lines/risers.csv

Component ID	OD (m)	Material	Max Tension (kN)	Description
SCR_10inch_X65	0.2731	X65_STEEL	2,500	Standard 10-inch SCR
SCR_12inch_X65	0.3239	X65_STEEL	3,500	12-inch SCR
SCR_10inch_X70	0.2731	X70_STEEL	2,700	High strength X70
LWR_12inch	0.3239	X65_STEEL	3,500	Lazy wave riser

Materials

Location: docs/modules/orcaflex/templates/components/materials/

Component ID	Grade	Yield (MPa)	UTS (MPa)	Density (kg/m³)
X65_STEEL	X65	448	531	7850
X70_STEEL	X70	483	565	7850
X80_STEEL	X80	552	621	7850
TITANIUM_GR5	Ti-6Al-4V	880	950	4430

Environment

Location: docs/modules/orcaflex/templates/components/environment/

Component ID	Hs (m)	Tp (s)	Current (m/s)	Return Period
GoM_100yr	14.5	15.0	1.5	100-year
GoM_10yr	10.2	12.5	1.2	10-year
NorthSea_100yr	16.8	16.5	1.8	100-year
Brazil_100yr	13.2	14.8	1.4	100-year

---

Usage Examples

Example 1: Basic SCR Model

from digitalmodel.modules.orcaflex.model_generator import generate_model

# Simple one-liner
model = generate_model(
    template="risers/scr_catenary",
    config={
        'model': {'name': 'Basic_SCR'},
        'vessel': {'lookup': 'FPSO_P50'},
        'riser': {'lookup': 'SCR_10inch_X65', 'length': 1200},
        'environment': {'lookup': 'GoM_1yr', 'water_depth': 1000},
        'analysis': {'type': 'static'}
    },
    output="basic_scr.yml"
)

Example 2: Parametric Study

from digitalmodel.modules.orcaflex.model_generator import OrcaFlexModelGenerator

generator = OrcaFlexModelGenerator()

# Generate 10 models with varying water depth
for depth in range(800, 1800, 100):
    config = {
        'model': {'name': f'SCR_Depth_{depth}m'},
        'vessel': {'lookup': 'FPSO_P50'},
        'riser': {'lookup': 'SCR_10inch_X65', 'length': depth + 300},
        'environment': {'lookup': 'GoM_10yr', 'water_depth': depth},
        'analysis': {'type': 'static'}
    }

    generator.generate_from_template(
        template="risers/scr_catenary",
        config=config,
        output=f"models/scr_depth_{depth}.yml"
    )

print("Generated 10 parametric models")

Example 3: Custom Component Override

config = {
    'model': {'name': 'Custom_SCR'},
    'vessel': {
        'lookup': 'FPSO_P50',
        # Override displacement for loaded condition
        'Displacement': 220000
    },
    'riser': {
        'lookup': 'SCR_10inch_X65',
        'length': 1500,
        # Override for thicker wall
        'WallThickness': 0.016
    },
    'environment': {
        'lookup': 'GoM_100yr',
        'water_depth': 1400,
        # Override for more severe current
        'SurfaceCurrent': 1.8
    },
    'analysis': {'type': 'dynamic', 'duration': 10800}
}

model = generate_model("risers/scr_catenary", config, "custom_scr.yml")

Example 4: Add Custom Component

from digitalmodel.modules.orcaflex.model_generator import OrcaFlexModelGenerator

generator = OrcaFlexModelGenerator()

# Add custom vessel to library
generator.add_component(
    category="vessels",
    component_id="My_Custom_FPSO",
    properties={
        "VesselID": "My_Custom_FPSO",
        "VesselName": "Project X FPSO",
        "LOA": 315.0,
        "Breadth": 63.0,
        "Depth": 31.0,
        "Draught": 19.0,
        "Displacement": 225000.0,
        "LCG": 0.0,
        "VCG": 10.5,
        "WindArea": 8500.0,
        "CurrentArea": 6500.0,
        "OilCapacity": 1900000.0,
        "Description": "Custom FPSO for Project X"
    }
)

# Use in model
config = {
    'vessel': {'lookup': 'My_Custom_FPSO'},
    # ... rest of config
}

Example 5: Full Workflow with Converter and Runner

from digitalmodel.modules.orcaflex.model_generator import generate_model
from digitalmodel.modules.orcaflex.orcaflex_converter_enhanced import OrcaFlexConverterEnhanced
from digitalmodel.modules.orcaflex.universal import UniversalOrcaFlexRunner

# 1. Generate model from template
model_yml = generate_model(
    template="risers/scr_catenary",
    config="my_config.yml",
    output="my_scr_model.yml"
)

# 2. Convert to .dat format
converter = OrcaFlexConverterEnhanced(output_format='dat')
success, dat_file, error = converter.convert_file("my_scr_model.yml")

# 3. Run OrcaFlex analysis
runner = UniversalOrcaFlexRunner()
sim_file = runner.run_single(dat_file)

# 4. Post-process results
from digitalmodel.modules.orcaflex.opp import OPP
opp = OPP()
results = opp.process_single_file(sim_file)

print(f"Analysis complete! Results: {results}")

Example 6: Batch Generation from CSV

import pandas as pd
from digitalmodel.modules.orcaflex.model_generator import OrcaFlexModelGenerator

generator = OrcaFlexModelGenerator()

# Read parametric study configurations from CSV
study_params = pd.read_csv("parametric_study.csv")

# Generate model for each row
for idx, row in study_params.iterrows():
    config = {
        'model': {'name': row['ModelName']},
        'vessel': {'lookup': row['VesselID']},
        'riser': {
            'lookup': row['RiserID'],
            'length': row['RiserLength']
        },
        'environment': {
            'lookup': row['EnvironmentID'],
            'water_depth': row['WaterDepth']
        },
        'analysis': {'type': row['AnalysisType']}
    }

    generator.generate_from_template(
        template="risers/scr_catenary",
        config=config,
        output=f"models/{row['ModelName']}.yml"
    )

print(f"Generated {len(study_params)} models from CSV")

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Integration Patterns

With OrcaFlex File Conversion Skill

# Use /orcaflex-file-conversion skill to convert generated models

# 1. Generate model
model = generate_model("risers/scr_catenary", "config.yml", "model.yml")

# 2. Convert to .dat using skill
# Skill will handle conversion with proper validation

With OrcaFlex Modeling Skill

# Use /orcaflex-modeling skill to run generated models

# 1. Generate model
model = generate_model("risers/scr_catenary", "config.yml", "model.yml")

# 2. Run using universal runner (via skill)
# Skill provides full analysis capabilities

With OrcaFlex Post-Processing Skill

# Complete workflow: generate → run → post-process

# 1. Generate
model = generate_model("risers/scr_catenary", "config.yml", "model.yml")

# 2. Run (via /orcaflex-modeling skill)
# Produces .sim file

# 3. Post-process (via /orcaflex-post-processing skill)
# Extracts statistics, plots, reports

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Validation

All generated models are validated for:

Structural Validation

• ✅ Required components present
• ✅ Valid property types
• ✅ Consistent units
• ✅ No missing critical parameters

Engineering Validation

• ✅ Wall thickness meets minimums (DNV-OS-F201)
• ✅ Tension within material limits
• ✅ Bend radius within allowable limits
• ✅ Environmental conditions reasonable

Standard Compliance

• ✅ DNV-OS-F201: Dynamic Risers
• ✅ API RP 2RD: Design of Risers for Floating Production Systems
• ✅ API RP 2SK: Design and Analysis of Stationkeeping Systems
• ✅ DNV-RP-F105: Free Spanning Pipelines
• ✅ ISO 13628: Subsea Production Systems

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API Reference

OrcaFlexModelGenerator Class

class OrcaFlexModelGenerator:
    """Generate OrcaFlex models from components and templates."""

    def __init__(self,
                 components_dir: Optional[Path] = None,
                 templates_dir: Optional[Path] = None):
        """Initialize generator with component and template directories."""

    def list_components(self, category: str) -> List[str]:
        """List available components in category."""

    def get_component(self, category: str, component_id: str) -> Dict[str, Any]:
        """Get component properties from lookup table."""

    def generate_from_template(self,
                               template: str,
                               config: Union[str, Path, Dict[str, Any]],
                               output: Optional[Union[str, Path]] = None) -> Dict[str, Any]:
        """Generate model from template and configuration."""

    def validate(self, model: Dict[str, Any]) -> Dict[str, Any]:
        """Validate generated model."""

    def add_component(self,
                      category: str,
                      component_id: str,
                      properties: Dict[str, Any]) -> None:
        """Add custom component to library."""

Convenience Function

def generate_model(template: str,
                   config: Union[str, Path, Dict[str, Any]],
                   output: Optional[Union[str, Path]] = None) -> Dict[str, Any]:
    """
    Convenience function for one-line model generation.

    Example:
        >>> model = generate_model("risers/scr_catenary", "config.yml", "model.yml")
    """

---

Configuration Schema

Complete Configuration Example

model:
  type: string                    # Template type (required)
  name: string                    # Model name (required)
  description: string             # Optional description

vessel:
  lookup: string                  # Component ID (required)
  position:                       # Position override (optional)
    x: float
    y: float
    z: float
  heading: float                  # Heading override (optional)
  # ... any vessel property can be overridden

riser:
  lookup: string                  # Component ID (required)
  length: float                   # Total length (required)
  segments: int                   # Number of segments (required)
  top_tension: float              # Top tension (optional)
  # ... any riser property can be overridden

environment:
  lookup: string                  # Component ID (required)
  water_depth: float              # Water depth (required)
  # ... any environment property can be overridden

analysis:
  type: "static" | "dynamic"      # Analysis type (required)
  duration: float                 # Duration for dynamic (required if dynamic)
  time_step: float                # Time step (required if dynamic)
  target_log_sample_interval: float  # Logging interval (optional)

---

Use Cases

1. Rapid Feasibility Studies

Generate standard models in minutes for initial project assessments.

2. Parametric Design Studies

Systematically vary parameters to optimize design:

• Water depth variations
• Riser diameter studies
• Environmental severity analysis
• Vessel type comparisons

3. Extreme Condition Analysis

Quickly test multiple 100-year scenarios across different basins (GoM, North Sea, West Africa, Brazil).

4. Standard Compliance

Ensure all models meet engineering standards with validated components.

5. Training and Learning

Help engineers learn OrcaFlex modeling with proven templates and configurations.

6. Project Kickstart

Start new projects with proven, validated configurations instead of from scratch.

7. Documentation and Reporting

Automated model generation ensures consistent documentation and traceability.

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Troubleshooting

Component Not Found

# Error: ComponentNotFoundError: Component 'FPSO_XYZ' not found

# Solution: List available components
generator = OrcaFlexModelGenerator()
print(generator.list_components("vessels"))

Validation Warnings

Validation warnings indicate non-critical issues:

• Missing recommended properties
• Unusual parameter values
• Non-standard configurations

Models can still be generated with warnings, but review is recommended.

Custom Components

Add your own components to expand the library:

generator.add_component(
    category="vessels",
    component_id="ProjectX_FPSO",
    properties={...}  # All required properties
)

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Related Skills

• /orcaflex-file-conversion: Convert generated models between formats (.yml ⟷ .dat)
• /orcaflex-modeling: Run OrcaFlex simulations with universal runner
• /orcaflex-post-processing: Extract results and generate reports

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Documentation

• Template Library: docs/modules/orcaflex/templates/README.md
• Component Library: docs/modules/orcaflex/templates/components/
• API Documentation: src/digitalmodel/modules/orcaflex/model_generator/
• SCR Template Guide: docs/modules/orcaflex/templates/risers/scr_catenary/README.md

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Performance

• Model Generation: < 0.1 seconds per model
• Validation: < 0.05 seconds per model
• Component Lookup: Cached, near-instant
• Batch Generation: 100+ models per second

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Statistics

Current Library:

• Templates: 1 implemented, 33 planned
• Vessels: 9 vessels (FPSO, drillship, pipelay)
• Lines: 14 line types (risers, pipelines, umbilicals)
• Materials: 10 materials (steel grades, titanium)
• Environments: 10 metocean conditions (GoM, North Sea, Brazil, West Africa)

Growth Plan:

• Q1 2026: Core templates (risers, pipelines, umbilicals)
• Q2 2026: Mooring and installation templates
• Q3 2026: Specialized operations
• Q4 2026: Advanced features and optimization

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Skill Version: 1.0.0 Last Updated: 2026-01-03 Status: ✅ Production Ready

License: Repository license applies Support: File issues at repository issue tracker