UDF for varying contact angle (wettability gradient))

aviitkgp1 · February 18, 2010, 04:28

Hi all Fluent users!

I am working on 'CFD simulation (3D)of a droplet moving under a wettability gradient'.
I want to introduce a wettability gradient by varying the contact angle. Could anyone help me with writing a UDF for introducing a contact angle variation along X axis in a 3D domain ? My domain is a 3D cuboid.

Ankit Verma

aviitkgp1 · March 10, 2010, 14:37

#include "udf.h"
I wrote this UDF for a 2D domain.

DEFINE_PROFILE(contact_angle,t,i)
{
real y[ND_ND];
real x;
face_t f;

begin_f_loop(f,t)
{
F_Centroid(y,f,t)
x=[1];
F_PROFILE(f,t,i)=30-(300*x);
}
end_f_loop(f,t)

}

Can anyone please help me in converting it to a 3D domain?
Thanks in advance!

February 18, 2010, 04:28	UDF for varying contact angle (wettability gradient))	#1
aviitkgp1 New Member Ankit verma Join Date: Oct 2009 Location: CHandigarh, Kharagpur Posts: 4 Rep Power: 16	Hi all Fluent users! I am working on 'CFD simulation (3D)of a droplet moving under a wettability gradient'. I want to introduce a wettability gradient by varying the contact angle. Could anyone help me with writing a UDF for introducing a contact angle variation along X axis in a 3D domain ? My domain is a 3D cuboid. Ankit Verma

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March 10, 2010, 14:37		#2
aviitkgp1 New Member Ankit verma Join Date: Oct 2009 Location: CHandigarh, Kharagpur Posts: 4 Rep Power: 16	#include "udf.h" I wrote this UDF for a 2D domain. DEFINE_PROFILE(contact_angle,t,i) { real y[ND_ND]; real x; face_t f; begin_f_loop(f,t) { F_Centroid(y,f,t) x=[1]; F_PROFILE(f,t,i)=30-(300*x); } end_f_loop(f,t) } Can anyone please help me in converting it to a 3D domain? Thanks in advance!