Learning Forum

[polmartorellgil]

Hi!

I am trying to predict the performance of a hydrofoil powerboat, where half of the hydrofoils are submerged and the rest of the boat is outside the water, so half of the domain is underwater and half is air. I am using the VOF model.

I was wondering what is the correct way to model a far-field boundary condition for the walls of my computational domain. I have a pressure inlet that defines the free surface level, a pressure outlet with the same water surface level and the symmetry wall, but the other three walls should be "far-field". Is the right way to do it a pressure outlet? I am getting reversed flow even though changed the definition of reversed flow to flow in the negative x direction (opposite to the freestream velocity).

Thank you!

[RK]

Hello,
Can you draw a rough sketch and insert an image in this post? This would help us understand better. Thanks.

[polmartorellgil]

[RK]

Thank you for the image. I am not sure why you using inlet and outlet. May I know the reason? Would it be something related to the problem definition of your simulation?

[polmartorellgil]

I am using a pressure inlet to define the free-surface level and flow velocity, and pressure outlet (outlet in the picture). The application I am studying is a hydrofoil partially submerged (thus the use of the VOF model). The problem I have is I have reversed flow on the pressure-outlet boundary (far-field condition on the sketch).
If there was a better way to set it up in terms of boundary conditions, what would that be?
Thank you!

[Rob]

Have a look at the open channel options available in the VOF model