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Hydrofoil wing in fluent

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Old   September 28, 2016, 10:44
Default Hydrofoil wing in fluent
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Martijn
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Hello all,

Currently I am working on a hydrofoil wing. I already calculated the lift en drag (coefficients) using XFoil. A software program for all kinds of airfoils. Now I wanted to know the lift and drag of the complete wing. This includes:

- two elliptical wing sections at the sides
- a middle wing section with same chord-length
- two nacelles to connect the wings to the struts and to house the bearings for pitch control of the wing sections.

As I already know the drag of the struts, I am only interested in the lift and drag of the complete wing including 2 nacelles.

Earlier, I used Ansys Fluent for the flow of a wind-tunnel contraction. Now I encounter a few problems:

- how to mesh this profile sufficiently (the enclosed box and the hydrofoil with nacelles)?

- which Turbulence model and turbulence values should I choose in water? Or is laminar flow sufficient for a low speed (12m/s max) foil?

Thank you in advance,

Martijn
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Old   September 30, 2016, 09:30
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Jobin
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Quote:
Originally Posted by wind_tunnel_contraction View Post
- which Turbulence model and turbulence values should I choose in water? Or is laminar flow sufficient for a low speed (12m/s max) foil?
The second part of this depends on your Reynolds number.
http://airfoiltools.com/calculator/r...&yt0=Calculate

For a speed of 12 m/s, you'll essentially need to work in the turbulent regime, for any appreciable chord.
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Old   September 30, 2016, 09:45
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Thank you for your answer,

which turbulent model should I use? I saw aerofoils with K-epsilon model. The problem with this model are the values for the parameters. How can I obtain these values?

Very low Turbulence Intensity value is assumed, but how low? The same for the viscosity ratio.

The chord length is approximately 0.08m and with a range of 5-12m/s the reynolds range is 5e5 to 1e6.
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Old   September 30, 2016, 09:50
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I don't know enough to answer all your questions, but yes, picking turbulence parameters is indeed a difficulty.

I would suggest the following approaches:
1) Look at literature on hydrofoils of similar scale and see if you can wean any information from there.
2) This page has some good guidelines on choosing turbulence parameters.
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airfoil 3d, fluent, hydrofoil, naca

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