|March 6, 2014, 17:51||
Oscillating airfoil for wind energy
Join Date: Feb 2014
Posts: 1Rep Power: 0
I am trying to simulate an airfoil oscillating vertically over a 6m displacement. i want to write UDFs to describe different relationships between the pitch of the airfoil and the vertical displacement. first i am trying a sinusoidal relationship so the foil is at max angle of attack at the centre of the displacement and the there is also a spring force pulling it back to the centre of the range. the foil is a symmetrical NACA0012 of chord length 1m in a constant air speed of 10m/s
i aim to find the best pitch motion that will completes a complete oscillation the quickest.
to do this i am using an interpreted six degrees of freedom UDF shown below:
DEFINE_SDOF_PROPERTIES(fmotion5, prop, dt, time, dtime)
real a ;
#define PI 3.14159265;
real THETAMAX =0.349;
prop[SDOF_MASS] = 5;
prop[SDOF_IZZ] = 0.00001;
a = ((vel)/(sqrt(vel*vel)))*THETAMAX*cos(asin((x)/3));
I can only interpret the UDF due to the restrictions on the university computer i am using.
When i hook the UDF in, the airfoil shows no motion and i sometimes get negative cell volumes. Can anyone help me on this?
I am quite new to CFD by the way.
Thanks in advance
|airfoil2d, oscillating airfoil, sixdof, udf and programming|
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