[MagFire]

Hi Everyone,

I want to simulate pigging* process in pipelines using udf in fluent. Currently, I am learning about udfs and their implementation. Basically what i want to do is to model a 2D rectangular pipe geometry of certain length and inside that i'll have another small rectangular geometry of pig of some guessed length near to inlet.
I'll be using water as fluid initially which will move the pig held in its path from inlet boundary to outlet boundary. Can somebody enlighten me with the kind of udf i should use for above mentioned work and the detailed procedure for how to hook it to proceed.

*Pigging is process used to clean and protect offshore and onshore pipelines and pig is a device that is sent at regular time intervals along the entire pipeline length to scrap off any deposited debris or wax


Thanks.

[gowtham dada]

i m also working in the same problem.. did you got anything regarding this..
If you had any material kindly send it to me.
kindly contact anything regard this

gowthamdada10@gmail.com

[bplturner]

You probably don't even need a UDF. It sounds like you can define that motion with a simple profile.

[gowtham dada]

Originally Posted by bplturner

You probably don't even need a UDF. It sounds like you can define that motion with a simple profile.

Can you explain further?
Here i mention my my model. I have to move the tool (Pig) by giving high pressure in inlet

[gowtham dada]

Originally Posted by bplturner

You probably don't even need a UDF. It sounds like you can define that motion with a simple profile.

Can you explain further?
Here i mention my my model. I have to move the tool (Pig) by giving high pressure in inlet.

UDF for dynamic mesh.

#include "udf.h"
DEFINE_SDOF_PROPERTIES(projectile, prop, dt, time, dtime)
{
prop[SDOF_MASS] = 0.5;
prop[SDOF_IXX] = 0.0;
prop[SDOF_IYY] = 0.0;
prop[SDOF_IZZ] = 0.0;
printf ("\nprojectile: updated 6DOF properties");
}


Instead of UDF, i enabled SDOF condition and one DOF Translation. but i cant move the tool.