value uniform 1/0 meaning for contact angle boundary condition?

Saideep · May 20, 2015, 12:31

Hi Foamers;

I have a rather basic question. I am dealing with two phase flows using the interFOAM solver. I try to implement the boundary condition for the contact angle at the top and bottom layers of my rectangular domain.

I use the following boundary condition:
top {
type constantAlphaContactAngle;
limit gradient;
theta0 0;
value uniform 1;
}

I am curious to know what does the value uniform 1 mean in this case? I even changed the value to uniform 0 and I have the same set of results.

I would be happy if anyone could clarify this.

Thanks.

Saideep · May 20, 2015, 13:39

Sorry guys;

it was so easy!! The value over there is for the contact angle. 0 - 180 are valid. 0 is not considering any contact angle effects and any value of alpha depends on the condition for your run.

Could be useful for any others. Sorry to bother you!!

DanieleC · March 6, 2019, 05:57

Dear Saideep

If I understand well, putting theta0=45 and " value uniform 0" I will have a contact angle of 0. Instead, by setting "value uniform 1" I will have a contact angle of 45. That right?

May 20, 2015, 12:31	value uniform 1/0 meaning for contact angle boundary condition?	#1
Saideep Senior Member Saideep Join Date: Apr 2015 Location: INDIA Posts: 203 Rep Power: 12	Hi Foamers; I have a rather basic question. I am dealing with two phase flows using the interFOAM solver. I try to implement the boundary condition for the contact angle at the top and bottom layers of my rectangular domain. I use the following boundary condition: top { type constantAlphaContactAngle; limit gradient; theta0 0; value uniform 1; } I am curious to know what does the value uniform 1 mean in this case? I even changed the value to uniform 0 and I have the same set of results. I would be happy if anyone could clarify this. Thanks.

May 20, 2015, 13:39	value is the fixed angle of contact to the solid surface.	#2
Saideep Senior Member Saideep Join Date: Apr 2015 Location: INDIA Posts: 203 Rep Power: 12	Sorry guys; it was so easy!! The value over there is for the contact angle. 0 - 180 are valid. 0 is not considering any contact angle effects and any value of alpha depends on the condition for your run. Could be useful for any others. Sorry to bother you!!

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March 6, 2019, 05:57		#3
DanieleC New Member Daniele Catucci Join Date: Mar 2019 Posts: 5 Rep Power: 7	Dear Saideep If I understand well, putting theta0=45 and " value uniform 0" I will have a contact angle of 0. Instead, by setting "value uniform 1" I will have a contact angle of 45. That right?