[swak4Foam] groovyBC for simulating the opening and closing of a valve

will_ca · February 16, 2015, 05:28

Hello everyone,

I'm trying trying to use groovyBC to siulate the opening and closing of a valve. The “valve” is just a patch that sometimes should behave like a wall and sometimes as an outlet.

I'm using this in the 0/p file

Code:

type groovyBC;      
value uniform 1e5;
valueExpression "1e5";    
gradientExpression "0";  
fractionExpression "cos(time())>0.5 ? 1 : 0";

and this in the U file

Code:

type groovyBC; 
value uniform (0 0 0); 
valueExpression "vector(0,0,0)"; 
gradientExpression "vector(0,0,0)"; 
fractionExpression "cos(time())>0.5 ? 1 : 0";

but it doesn't work. The behaviour at the patch doesn't make sense. It looks rather as if the valve does not close.

Can anyone tell me what I'm doing wrong? Could it be a problem that I am using a moving mesh?

Thank you,

Caro

will_ca · February 17, 2015, 06:27

Does anyone have an idea? Please

February 16, 2015, 05:28	groovyBC for simulating the opening and closing of a valve	#1
will_ca New Member Caro Join Date: Jul 2014 Posts: 15 Rep Power: 11	Hello everyone, I'm trying trying to use groovyBC to siulate the opening and closing of a valve. The “valve” is just a patch that sometimes should behave like a wall and sometimes as an outlet. I'm using this in the 0/p file Code: type groovyBC; value uniform 1e5; valueExpression "1e5"; gradientExpression "0"; fractionExpression "cos(time())>0.5 ? 1 : 0"; and this in the U file Code: type groovyBC; value uniform (0 0 0); valueExpression "vector(0,0,0)"; gradientExpression "vector(0,0,0)"; fractionExpression "cos(time())>0.5 ? 1 : 0"; but it doesn't work. The behaviour at the patch doesn't make sense. It looks rather as if the valve does not close. Can anyone tell me what I'm doing wrong? Could it be a problem that I am using a moving mesh? Thank you, Caro Last edited by will_ca; February 16, 2015 at 08:53.

February 17, 2015, 06:27	groovyBC valve	#2
will_ca New Member Caro Join Date: Jul 2014 Posts: 15 Rep Power: 11	Does anyone have an idea? Please

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