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Forum: Main CFD Forum

November 5, 2015, 13:49

Replies: 18

Linear-Strength Vortex Unsteady Panel Method (2D)

Views: 6,971

Posted By blackjack

Simone, You haven't described what your...

Simone,

You haven't described what your program does correctly, so I propose the following course of action:

1. Add an input flag to skip the wake, so you can calculate flow without...

Forum: Main CFD Forum

April 6, 2012, 14:49

Replies: 18

Linear-Strength Vortex Unsteady Panel Method (2D)

Views: 6,971

Posted By blackjack

Attachment here

Attachment here

Forum: Main CFD Forum

April 6, 2012, 14:45

Replies: 18

Linear-Strength Vortex Unsteady Panel Method (2D)

Views: 6,971

Posted By blackjack

I don't know the pitch axis for your case: c/4,...

I don't know the pitch axis for your case: c/4, c/2? Moment is about c/4, c/2?

Your approach to dphi/dt sounds fine. Attached is the potential calculated for a 0012 at steady 10 degrees alpha. ...

Forum: Main CFD Forum

April 5, 2012, 14:04

Replies: 18

Linear-Strength Vortex Unsteady Panel Method (2D)

Views: 6,971

Posted By blackjack

The link to the .pdf file does not work. The...

The link to the .pdf file does not work.

The scheme to find dphi/dt should work.

I have run your case. The time derivative at the leading edge is quite small - it contributes less than 0.003...

Forum: Main CFD Forum

April 4, 2012, 14:15

Replies: 18

Linear-Strength Vortex Unsteady Panel Method (2D)

Views: 6,971

Posted By blackjack

Your Kutta condition of equal upper and lower...

Your Kutta condition of equal upper and lower vorticity will not work for an oscillating airfoil which must be allowed to shed vorticity into the wake.
...

Forum: Main CFD Forum

April 4, 2012, 13:52

Replies: 18

Linear-Strength Vortex Unsteady Panel Method (2D)

Views: 6,971

Posted By blackjack

Sorry for the typo: Cp=1-V^2+2d(phi)/dt I...

Sorry for the typo: Cp=1-V^2+2d(phi)/dt

I use the method of Luigi Morino, it applies to Oscillatory or unsteady or steady subsonic conditions. The time derivative is more significant as the...

Forum: Main CFD Forum

April 3, 2012, 13:44

Replies: 18

Linear-Strength Vortex Unsteady Panel Method (2D)

Views: 6,971

Posted By blackjack

The unsteady Bernoulli eqn applies: ...

The unsteady Bernoulli eqn applies:

http://web.mit.edu/2.016/www/handouts/Unsteady_Bernoulli%27s_Derivation_050921.pdf

(I'm sure there are better descriptions, but this is the first acceptable...

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