Davie, a major player in the marine and shipbuilding sector in Canada, teamed up with Creaform for the preventive analysis of a LNG leak in the tank holding room of a specific ship.
The hypothetical leak partly filled up the connexion space with LNG at -162°C, significantly cooling the tank holding room. The goal of the analysis was to find the resulting temperature distribution in the steel structure of the tank holding room so that the effect on material strength could be assessed.
The CFD analysis consisted of a Conjugate Heat Transfer (CHT) simulation, allowing the resolution of the heat transfer from both solid and fluid volumes within a single simulation (total number of elements: 21M).
As the project was meant to analyze a precise critical situation of LNG leakage in the ship, the CFD simulation in transient mode would have been very long and cumbersome. Creaform’s team worked with Davie’s engineers to determine the most probable steady state of the event, avoiding the transient aspect and saving days of unnecessary calculations.
- Preliminary analysis of the project and recommendations on how to perform the CFD analysis
- Conjugate heat transfer methodology and techniques
- Preparation of geometry using CAD software
- Modeling of the insulation in walls, of the water tanks and of air inlets and outlets
- Insulation properties setup
- HVAC definition
- Setup of boundary conditions including heat transfer coefficient with domain surroundings
- CFD analysis (RANS type, second order discretization)
- Validation of heat flows
- Post-processing including air flow patterns, temperature distribution in air and structure, critical cool spots
TOOLS AND METHODS USED
Based on the client’s needs, Creaform used the following tools and methods:
- Conjugate heat transfer