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Sloshing in Fuel Storage

Hawari, Yasmin LU (2016) KET920 20161
Chemical Engineering (M.Sc.Eng.)
Abstract
The aim of this project was to develop a method for simulating the movement of a fluid in a fuel tank of a truck that is in motion. The pressure that is built up on the tank walls was also calculated. Once the method was developed it could be used for analyzing and understanding the phenomenon that is sloshing.

The method developed cover all parts of the process, from start to finish. The first part of the project focused on the fuel tank. A CAD file with the tank geometry was imported to ANSA. The geometry was prepared and surface meshed and then exported to STAR CCM+. A volume mesh was generated in STAR and the simulations were also performed in STAR.
Unfortunately the results could not be verified with experimental data due to not... (More)
The aim of this project was to develop a method for simulating the movement of a fluid in a fuel tank of a truck that is in motion. The pressure that is built up on the tank walls was also calculated. Once the method was developed it could be used for analyzing and understanding the phenomenon that is sloshing.

The method developed cover all parts of the process, from start to finish. The first part of the project focused on the fuel tank. A CAD file with the tank geometry was imported to ANSA. The geometry was prepared and surface meshed and then exported to STAR CCM+. A volume mesh was generated in STAR and the simulations were also performed in STAR.
Unfortunately the results could not be verified with experimental data due to not having a proper method for measuring the pressure experimentally. There has been some experimental testing using the same tank filled with water. Acceleration signals from that experiment have been used in the simulations so that the tank movements were the same in the experimental and numerical case. Due to limitations like time and lack of experimental data there were not enough information to make a general method that can be used in all sloshing cases. The method could however be used to calculate how strong the tank should be not to be affected by the sloshing. It also gave some understanding to the behavior of fluids in motion.
To understand the effect of viscosity, density and fluid level on sloshing the simulations were done for two different scenarios. The first scenario was that the tank was filled with diesel; the second scenario was that the tank was filled with water. To compensate for the difference in density between diesel and water, the tank with water was only filled with 80 % of what the tank with diesel was filled with. Another reason for simulating both water and diesel filled tank was to see if it is representative to use water instead of diesel when doing experimental testing.
The results showed that the pressure was the highest at the highest fluid level, 90%. The places where the pressure was the highest were dependent on the type of movement. When the movement was vertical, the pressure was the highest in the middle of the tank. When the movement was longitudinal, the pressure was the highest in the front of the tank. Longitudinal movement was more aggressive and the pressure in the tank was higher during that type of movement. From the results it could also be concluded that it is reasonable to use water at the calculated ratio instead of diesel when doing the experimental testing on the tank for vertical movement. When the tank moves longitudinally, however, it is not as simple to make a conclusion and it is safer to use the same amount of water as diesel in the experiments. (Less)
Popular Abstract
Sloshing is known as the movement of a fluid, e.g. liquid and gas, in a partly filled tank or a vessel that is in motion. The aim of this project was to develop a method for simulating sloshing in the tank of a truck. Once the method was developed it was used for analyzing and understanding the phenomenon that is sloshing. This led to development of experimental testing of the effect of sloshing on truck tanks.
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author
Hawari, Yasmin LU
supervisor
organization
course
KET920 20161
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Sloshing Navier- Stokes Equation Fluid dynamics, chemical engineering, kemiteknik
language
English
id
8871215
date added to LUP
2016-04-21 10:42:55
date last changed
2016-04-21 10:42:55
@misc{8871215,
  abstract     = {The aim of this project was to develop a method for simulating the movement of a fluid in a fuel tank of a truck that is in motion. The pressure that is built up on the tank walls was also calculated. Once the method was developed it could be used for analyzing and understanding the phenomenon that is sloshing. 

The method developed cover all parts of the process, from start to finish. The first part of the project focused on the fuel tank. A CAD file with the tank geometry was imported to ANSA. The geometry was prepared and surface meshed and then exported to STAR CCM+. A volume mesh was generated in STAR and the simulations were also performed in STAR. 
Unfortunately the results could not be verified with experimental data due to not having a proper method for measuring the pressure experimentally. There has been some experimental testing using the same tank filled with water. Acceleration signals from that experiment have been used in the simulations so that the tank movements were the same in the experimental and numerical case. Due to limitations like time and lack of experimental data there were not enough information to make a general method that can be used in all sloshing cases. The method could however be used to calculate how strong the tank should be not to be affected by the sloshing. It also gave some understanding to the behavior of fluids in motion.
To understand the effect of viscosity, density and fluid level on sloshing the simulations were done for two different scenarios. The first scenario was that the tank was filled with diesel; the second scenario was that the tank was filled with water. To compensate for the difference in density between diesel and water, the tank with water was only filled with 80 % of what the tank with diesel was filled with. Another reason for simulating both water and diesel filled tank was to see if it is representative to use water instead of diesel when doing experimental testing.
The results showed that the pressure was the highest at the highest fluid level, 90%. The places where the pressure was the highest were dependent on the type of movement. When the movement was vertical, the pressure was the highest in the middle of the tank. When the movement was longitudinal, the pressure was the highest in the front of the tank. Longitudinal movement was more aggressive and the pressure in the tank was higher during that type of movement. From the results it could also be concluded that it is reasonable to use water at the calculated ratio instead of diesel when doing the experimental testing on the tank for vertical movement. When the tank moves longitudinally, however, it is not as simple to make a conclusion and it is safer to use the same amount of water as diesel in the experiments.},
  author       = {Hawari, Yasmin},
  keyword      = {Sloshing Navier- Stokes Equation Fluid dynamics,chemical engineering,kemiteknik},
  language     = {eng},
  note         = {Student Paper},
  title        = {Sloshing in Fuel Storage},
  year         = {2016},
}