orcaflex-modal-analysis

Perform modal and frequency analysis on OrcaFlex models to extract natural frequencies, mode shapes, and identify dominant DOF responses. Use for VIV assessment, resonance identification, and structural dynamics characterization.

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Repository: vamseeachanta/workspace-hub
Last source activity: May 4, 2026 at 15:05
Detected SKILL.md language: English
Stars: 16
Forks: 7

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Orcaflex Modal Analysis

When to Use

Extract natural frequencies from OrcaFlex models

Calculate mode shapes for risers, lines, and structures

Identify dominant degrees of freedom in each mode

Filter modes by specific DOF (heave, surge, pitch, etc.)

VIV susceptibility screening (compare natural frequencies to shedding frequencies)

Resonance identification for environmental loading

Batch processing multiple water depths or configurations

Prerequisites

OrcaFlex license (for OrcFxAPI)

Python environment with digitalmodel package installed

Model files (.dat, .yml, or .sim)

Python API

Basic Modal Analysis

from digitalmodel.orcaflex.orcaflex_modal_analysis import OrcModalAnalysis # Initialize analyzer modal = OrcModalAnalysis() # Configure analysis cfg = { "default": { "Analysis": { *See sub-skills for full details.* ### Direct OrcFxAPI Usage ```python import OrcFxAPI # Load model and calculate statics model = OrcFxAPI.Model() model.LoadData("model.yml") model.CalculateStatics() # Configure modal analysis spec = OrcFxAPI.ModalAnalysisSpecification( *See sub-skills for full details.* ### Extract Dominant DOFs ```python from digitalmodel.orcaflex.orcaflex_modal_analysis import OrcModalAnalysis import pandas as pd modal = OrcModalAnalysis() # After running analysis, get summary all_modes_summary_df = modal.all_file_summary["Case1"] # Filter modes dominated by specific DOF *See sub-skills for full details.* ## Related Skills - [orcaflex-modeling](../orcaflex-modeling/SKILL.md) - Run OrcaFlex simulations - [viv-analysis](../viv-analysis/SKILL.md) - VIV susceptibility assessment - [orcaflex-static-debug](../orcaflex-static-debug/SKILL.md) - Static convergence troubleshooting - OrcFxAPI Modal Analysis: Orcina Documentation - DNV-RP-C205: Environmental Conditions Environmental Loads - API RP 2RD: Design of Risers Floating Production Systems - Source: `src/digitalmodel/modules/orcaflex/orcaflex_modal_analysis.py` - Config: `src/digitalmodel/base_configs/modules/orcaflex/orcaflex_modal_analysis.yml` - [Basic Modal Analysis (+)](basic-modal-analysis/SKILL.md) - [Model Preparation (+)](model-preparation/SKILL.md) - [Version Metadata](version-metadata/SKILL.md) - [[] - -01-](--01-/SKILL.md) - [ Static Equilibrium → Modal Analysis](-static-equilibrium-modal-analysis/SKILL.md) - [Mode Shapes CSV (+)](mode-shapes-csv/SKILL.md) - [DOF Percentage Calculation (+)](dof-percentage-calculation/SKILL.md) - [Common Errors Fixes (+)](common-errors--fixes/SKILL.md) - [Expected Frequency Ranges (+)](expected-frequency-ranges/SKILL.md) - [With VIV Analysis (+)](-viv-analysis/SKILL.md)