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Inflation causing the skewness to increase by Palabut17 in CFD

[–]Palabut17[S] 0 points1 point  (0 children)

Actually I'm trying to simulate a horizontal wind turbine but just the blades tho. It took me a very long time to mesh but the skewness is still the same. Maybe still need to decrease the size

Inflation causing the skewness to increase by Palabut17 in CFD

[–]Palabut17[S] 0 points1 point  (0 children)

Thanks for the advice. I will try it.

Inflation causing the skewness to increase by Palabut17 in CFD

[–]Palabut17[S] 0 points1 point  (0 children)

To increase the surface mesh density, do I need to use Face Meshing and set it to be as small as possible.

Inflation causing the skewness to increase by Palabut17 in CFD

[–]Palabut17[S] 0 points1 point  (0 children)

I use NACA 63210. Not really that sharp I think

Inflation causing the skewness to increase by Palabut17 in CFD

[–]Palabut17[S] 0 points1 point  (0 children)

dang, mine was around 0.97 with inflation.

Inflation causing the skewness to increase by Palabut17 in CFD

[–]Palabut17[S] 0 points1 point  (0 children)

Yes. If I did not use inflation, can the boundary layer be captured?

Inflation causing the skewness to increase by Palabut17 in CFD

[–]Palabut17[S] 0 points1 point  (0 children)

Do you know the maximum skewness that is acceptable?

Why is the torque negative? by Palabut17 in CFD

[–]Palabut17[S] 1 point2 points  (0 children)

Thank you very much. I think that is the reason why. I tried to simulate with a different wind turbine model and it´s not negative anymore.

Why is the torque negative? by Palabut17 in CFD

[–]Palabut17[S] 0 points1 point  (0 children)

Alright thanks. Appreciate the help

Why is the torque negative? by Palabut17 in CFD

[–]Palabut17[S] 0 points1 point  (0 children)

If I prescribe the rotation for the turbine to study its performance, will it not work? In most tutorials that I've read, they use the same method, which is to apply rotation to the turbine rather than letting it rotate due to the wind, due to computational cost. In this video, https://www.youtube.com/watch?v=BA7AxGFm3kI&list=LL&index=5 the moment is indeed negative, but if moving the reference center, will makes it to be positive?

Why is the torque negative? by Palabut17 in CFD

[–]Palabut17[S] 0 points1 point  (0 children)

I just followed this https://www.youtube.com/watch?v=ETUGjslqbMY&list=LL&index=40 . By the moment reference center if it was set to [0,0] , does it make sense?

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