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Forum: Fluent UDF and Scheme Programming

June 21, 2012, 10:40

Replies: 21

DEFINE_CG_MOTION for flapping wing UDF

Views: 8,547

Posted By pdp.aero

GRID_MOTION used for non-rigid object but...

GRID_MOTION used for non-rigid object but CG_MOTION used for move the rigid center of gravity object.

Forum: Fluent UDF and Scheme Programming

December 16, 2011, 05:45

Replies: 21

DEFINE_CG_MOTION for flapping wing UDF

Views: 8,547

Posted By pdp.aero

in this case you must move your flap smoothly to...

in this case you must move your flap smoothly to theta=10 deg with different function and UDF with Cg-motion macro , without solve the flow equation. that's means you must hook your cg-motion UDF...

Forum: Fluent UDF and Scheme Programming

December 16, 2011, 04:40

Replies: 21

DEFINE_CG_MOTION for flapping wing UDF

Views: 8,547

Posted By pdp.aero

ok! with f=6 for your flap ; use same function...

ok! with f=6 for your flap ; use same function with different coefficient!
theta(t)=40.*sin(2.*pi.*6.*(t+3.6)+30)
this gave you theta=10 at t=0 and theta=40 at t=2.7662, be sure its true.
you can...

Forum: Fluent UDF and Scheme Programming

December 15, 2011, 12:15

Replies: 21

DEFINE_CG_MOTION for flapping wing UDF

Views: 8,547

Posted By pdp.aero

aha! you can use this function: ...

aha!
you can use this function:
theta(t)=40*sin(2*pi*50*(t+0.4314)+30);
f=50;
arcsin(3/6)=30 deg;
then you got theta=10 deg in t= 0 sec and theta=-40 deg in t=0.33 sec
with time-step=0.0001...

Forum: Fluent UDF and Scheme Programming

December 15, 2011, 09:04

Replies: 21

DEFINE_CG_MOTION for flapping wing UDF

Views: 8,547

Posted By pdp.aero

sorry i asked this questions , i curious about...

sorry i asked this questions , i curious about your problem!
and what's the problem with those function that you mention for theta(t) and d(theta)/dt...?
in every time-step you have t ,so you can...

Forum: Fluent UDF and Scheme Programming

December 15, 2011, 03:47

Replies: 21

DEFINE_CG_MOTION for flapping wing UDF

Views: 8,547

Posted By pdp.aero

Hello xyh001 one point about the writing udf...

Hello xyh001
one point about the writing udf that i remember and i think you should be contain it, its your argument must be in radian!
sorry i don't understood clearly your problem.
i hope its be...

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