Problem with implementing tau in udf

Rabeyia Manzoor Illahi · July 14, 2020, 08:01

HI!
I HAVE TO WRITE A UDF FOR FLAPPING MOTION OF A FLATE PLATE IN WHICH ALPHA IS ALSO CHANGING.
IM UNABLE TO UNDERSTAND HOW TO INCORPORATE TAU OF THE FOLLOWING EQUATIONS.

a" + = 0.5a'+{1 - cos[2pi(t-tr)/Dtr]}; tr<t<tr+Dtr

a"=alpha dot , a'=alpha dot subscript knot, t=tau

IF SOMEONE CAN PLEASE HELP, I'LL BE REALLY VERY GRATEFUL.
REGARDS

AlexanderZ · July 15, 2020, 02:34

what does it mean "UNABLE TO UNDERSTAND HOW TO INCORPORATE TAU OF THE FOLLOWING EQUATIONS."

and what is tau?
show the cod you already have

Rabeyia Manzoor Illahi · July 15, 2020, 02:44

Thank you so much for your reply Sir.
Sir my problem consists of flapping in three parts:
1. Pitching down rotation and translation acceleration
2.translation at constant angle of attack and constant speed
3. pitching up rotation and translational deceleration at end of stroke.
I have all the equations and the intervals of tau (non dimensional )time as well.
I am unable to write it in UDF.
If you can please help

July 14, 2020, 08:01	Problem with implementing tau in udf	#1
Rabeyia Manzoor Illahi New Member Outside US and Canada Join Date: Apr 2020 Posts: 11 Rep Power: 6	HI! I HAVE TO WRITE A UDF FOR FLAPPING MOTION OF A FLATE PLATE IN WHICH ALPHA IS ALSO CHANGING. IM UNABLE TO UNDERSTAND HOW TO INCORPORATE TAU OF THE FOLLOWING EQUATIONS. a" + = 0.5a'+{1 - cos[2pi(t-tr)/Dtr]}; tr<t<tr+Dtr a"=alpha dot , a'=alpha dot subscript knot, t=tau IF SOMEONE CAN PLEASE HELP, I'LL BE REALLY VERY GRATEFUL. REGARDS

July 15, 2020, 02:34		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	what does it mean "UNABLE TO UNDERSTAND HOW TO INCORPORATE TAU OF THE FOLLOWING EQUATIONS." and what is tau? show the cod you already have __________________ best regards ****************************** press LIKE if this message was helpful

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July 15, 2020, 02:44		#3
Rabeyia Manzoor Illahi New Member Outside US and Canada Join Date: Apr 2020 Posts: 11 Rep Power: 6	Thank you so much for your reply Sir. Sir my problem consists of flapping in three parts: 1. Pitching down rotation and translation acceleration 2.translation at constant angle of attack and constant speed 3. pitching up rotation and translational deceleration at end of stroke. I have all the equations and the intervals of tau (non dimensional )time as well. I am unable to write it in UDF. If you can please help