Flow Induced Vibration Analysis
Flow-Induced Vibration (FIV) and Vortex-Induced Vibration (VIV)
Flow-Induced Vibration (FIV) occurs when fluid flow interacts with a structure, generating dynamic forces that can lead to fatigue, instability, or even catastrophic failure. One of the most common and critical forms of FIV is Vortex-Induced Vibration (VIV) — especially prevalent in structures with bluff or circular cross-sections, such as pipelines, chimneys, tethers, and cables.
Simulation Capabilities
Coupled CFD–FEA Simulation for Heat Exchanger Tube Vibration
We perform integrated CFD and structural FEA simulations to assess flow-induced vibration risks in heat exchanger tube bundles. CFD is used to resolve complex flow patterns and turbulence characteristics across baffle spans, while FEA captures structural dynamics and mode shapes of the tubes. The coupled analysis allows us to predict excitation mechanisms like vortex shedding and fluidelastic instability. We evaluate vibration amplitudes, fretting wear potential, and recommend mitigation strategies per EPRI and ASME guidelines.
Multiphysics FIV Assessment
This service involves advanced Multiphysics simulations where CFD is used to model internal flow regimes—including slug flow, acoustic resonance, and vortex shedding—while FEA evaluates the dynamic response of piping or structural members. The coupled model helps identify fatigue-critical zones, support loads, and cross-flow induced vibration effects. This approach is vital for offshore risers, FPSOs, and critical piping systems in LNG and petrochemical plants, ensuring compliance with fatigue standards like DNV-RP-F105 and ASME B31.3.
Why Flow-Induced Vibration Analysis Matters
Flow-Induced Vibration (FIV) can cause severe dynamic instability in piping systems, heat exchanger tubes, offshore structures, and rotating machinery. It often leads to fatigue damage, noise, joint failures, tube collisions, and in extreme cases, catastrophic structural failure. These vibrations are triggered by complex flow phenomena such as vortex shedding, turbulent buffeting, acoustic resonance, and fluid-elastic instability—especially in high-velocity gas and liquid systems.
Key Engineering Benefits of FIV Analysis:
- Avoid Resonance from Flow Excitations: Identify excitation frequencies from flow dynamics that may align with structural modes and amplify vibration.
- Predict Critical Flow Regimes: Simulate vortex shedding, cross-flow effects, and wake-induced oscillations to understand operating thresholds.
- Mitigate Tube Failures in Heat Exchangers: Evaluate tube-to-tube collisions and fluid-elastic instability to design robust supports and damping systems.
- Support Design of Offshore & Subsea Structures: Analyze wave and current-induced vibrations to ensure fatigue compliance and structural longevity.
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