## Fluids

#### Square fuel tank with jet fuel inside and simulate the temperature cooling.

• Chun-Wei Tsai
Subscriber

Hello!

I am currently trying to build a model of a square fuel tank (will start from 2D if success will move to 3D), I am wondering what are the steps to build the model that can simulate a square fuel tank contains half jet fuel vapour and half jet fuel liquid in a freezing temperature (approximately -70 degree C). The result will be looking at the temperature profile over times. I am thinking about transient thermal in the workbench but not sure what are the general procedure.

Thank you very much!

• Nikhil Narale
Ansys Employee

Hello,

"contains half jet fuel vapour and half jet fuel liquid"

Can you please elaborate on this, perhaps by sharing some illustrations?

I would recommend you to try this out in the Ansys Fluent.

Chapter 20: Using the VOF Model (ansys.com)

Chapter 19: Modeling Evaporating Liquid Spray (ansys.com)

If you are not able to access the link, refer to this forum discussion:

Thanks!

Nikhil

• SRP
Subscriber

Hi,

In order to carry out the simulation, I advise using the multiphase model (VOF).

For more details about the multiphase, please refer to the theory guide: Chapter 14: Multiphase Flows (ansys.com)

Also, please refer to the user's guide: Chapter 22: Modeling Multiphase Flows (ansys.com)

Hope you find this useful

Thank you

• Chun-Wei Tsai
Subscriber

Sorry if I didn't make the question clear enough, I am going to build a simple square model with fuel already inside. I want to place the model in a very cool condition (about -70 degree celcius) for a certain time, and I want to see the temperature contour plot and observe that how long does it take for the fuel inside the square tank to reach a certain temperature.

Thank you very much!

• Rob
Ansys Employee

OK, so the multiphase part of the examples is OK, you need to patch the fuel level. Note, you'll need a vent otherwise the whole system is going to get interesting unless the gas is compressible! Don't forget you'll need density to vary with temperature & turn gravity on if you want to see natural convection.