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Investigation of Water Mist Fire Supression System in Submarine Application

Rustas, Hannes LU (2023) MVKM01 20231
Department of Energy Sciences
Abstract
This thesis investigates the effectiveness of a water mist fire suppression system in a submarine environment. As a first step in evaluating the viability of such a system aboard
SAAB submarines, the water mist was simulated using an Eulerian-Lagrangian multi-phase
model in the the commercial software Star CCM+. The CFD simulation results provide a
good visualisation of the distribution of the mist and, to some extent, its extinguishing effectiveness. A 3D-model of a submarine compartment was created using CAD-software,
simplifying it where needed in order to improve the quality of the subsequent meshing operations. A number of meshes were created in order to investigate the sensitivity of the
results to the mesh fidelity. Two more... (More)
This thesis investigates the effectiveness of a water mist fire suppression system in a submarine environment. As a first step in evaluating the viability of such a system aboard
SAAB submarines, the water mist was simulated using an Eulerian-Lagrangian multi-phase
model in the the commercial software Star CCM+. The CFD simulation results provide a
good visualisation of the distribution of the mist and, to some extent, its extinguishing effectiveness. A 3D-model of a submarine compartment was created using CAD-software,
simplifying it where needed in order to improve the quality of the subsequent meshing operations. A number of meshes were created in order to investigate the sensitivity of the
results to the mesh fidelity. Two more sensitivity analyses were carried out: A turbulence
model and parcel count sensitivity analysis. The results of the sensitivity analyses showed
little sensitivity for the velocity field of the flow, while the temperature was more sensitive.
Based on the sensitivity analyses, a final simulation setup was decided on. The simulations
were carried out for 10 seconds of physical time. The results showed a rapid cooling effect
of the compartment and a large degree of oxygen dilution, favorable in an extinguishing
scenario. However, the sensitivity of the analysis and the many assumptions and simplifications common to all CFD analysis, should be taken into account when interpreting the
results. As mentioned, this thesis is only the first step in the investigation of water mist
fire suppression systems. Future work could for example be: Adding additional physics
models, such as radiation and fluid film, adding more detail in the CAD geometry and investigating the number and of and spacing of the water mist nozzles. (Less)
Please use this url to cite or link to this publication:
author
Rustas, Hannes LU
supervisor
organization
course
MVKM01 20231
year
type
H2 - Master's Degree (Two Years)
subject
keywords
CFD, Water Mist Fire Suppression
report number
LUTMDN/TMHP-23/5550-SE
ISSN
0282-1990
language
English
id
9134848
date added to LUP
2023-08-23 12:47:56
date last changed
2023-08-23 12:47:56
@misc{9134848,
  abstract     = {{This thesis investigates the effectiveness of a water mist fire suppression system in a submarine environment. As a first step in evaluating the viability of such a system aboard
SAAB submarines, the water mist was simulated using an Eulerian-Lagrangian multi-phase
model in the the commercial software Star CCM+. The CFD simulation results provide a
good visualisation of the distribution of the mist and, to some extent, its extinguishing effectiveness. A 3D-model of a submarine compartment was created using CAD-software,
simplifying it where needed in order to improve the quality of the subsequent meshing operations. A number of meshes were created in order to investigate the sensitivity of the
results to the mesh fidelity. Two more sensitivity analyses were carried out: A turbulence
model and parcel count sensitivity analysis. The results of the sensitivity analyses showed
little sensitivity for the velocity field of the flow, while the temperature was more sensitive.
Based on the sensitivity analyses, a final simulation setup was decided on. The simulations
were carried out for 10 seconds of physical time. The results showed a rapid cooling effect
of the compartment and a large degree of oxygen dilution, favorable in an extinguishing
scenario. However, the sensitivity of the analysis and the many assumptions and simplifications common to all CFD analysis, should be taken into account when interpreting the
results. As mentioned, this thesis is only the first step in the investigation of water mist
fire suppression systems. Future work could for example be: Adding additional physics
models, such as radiation and fluid film, adding more detail in the CAD geometry and investigating the number and of and spacing of the water mist nozzles.}},
  author       = {{Rustas, Hannes}},
  issn         = {{0282-1990}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Investigation of Water Mist Fire Supression System in Submarine Application}},
  year         = {{2023}},
}