[Bollonga]

Hi everybody,

I'm using a UDF with DEFINE_CG_MOTION to define the movement of an object in a 3D fluid domain. The path followed by the object is an irregular path so I wonder if there is a way for the macro to read a vector of positions instead of a mathematical description?

Thanks a lot

[like.no.other]

Hi
You can do this with a profile
It is very simple

[Bollonga]

Originally Posted by like.no.other

Hi
You can do this with a profile
It is very simple

Could you please explain me how to use a profile? Thanks a lot!

[like.no.other]

Originally Posted by Bollonga

Could you please explain me how to use a profile? Thanks a lot!

first you should create a file with prof extension (*.prof) like the attached picture.
in profile you can define the time dependent variables (v_x,v_y,v_z,omega_x,omega_y,omega_z)

for example in this profile the angular velocity in z direction is defined.

at the end you should read it in fluent.

[Bollonga]

Thanks a lot! You've been of great help!

[Bollonga]

What happens when the profile timestep is larger than the solver timestep? Does it linearly interpolate the position between the two profile timesteps?

Any help would be greatly appreciated. Thanks.