[ErenC]

Hello everyone!
I am trying to give sinusoidal BC(Temperature) to a wall, I tried to use groovyBC but somehow it doesnt work. Wall is the left wall, so I tried to use pos().y/L inside sin function. Here is the BC that doesnt work.

               type            groovyBC;
               value uniform 0;
               valueExpression "(311.3+A*sin(pos().y*pi/L))";
               variables 2 ("A=5;" "L=6.69e-2;");

If someone can point my error that would be great!
Eren.

[gschaider]

Originally Posted by ErenC

Hello everyone!
I am trying to give sinusoidal BC(Temperature) to a wall, I tried to use groovyBC but somehow it doesnt work. Wall is the left wall, so I tried to use pos().y/L inside sin function. Here is the BC that doesnt work.

               type            groovyBC;
               value uniform 0;
               valueExpression "(311.3+A*sin(pos().y*pi/L))";
               variables 2 ("A=5;" "L=6.69e-2;");

If someone can point my error that would be great!
Eren.

Rule of thumb: put at least as much work into the formulation of the question as you expect the other person to look at it. "Somehow it doesn't work" makes it a guessing game not a question for help and people usually go to this message board for the riddles



The expression looks syntactically OK. Whether the constants fit your case is something I can't know.


One thing that could cause a crash is "value uniform 0" as this value is used during initialization (before groovyBC had a chance to kick in) and depending on the the solver might lead to a crash during calculation of pressure or density. Make it "value uniform 331.3"

[ErenC]

Originally Posted by gschaider

Rule of thumb: put at least as much work into the formulation of the question as you expect the other person to look at it. "Somehow it doesn't work" makes it a guessing game not a question for help and people usually go to this message board for the riddles



The expression looks syntactically OK. Whether the constants fit your case is something I can't know.


One thing that could cause a crash is "value uniform 0" as this value is used during initialization (before groovyBC had a chance to kick in) and depending on the the solver might lead to a crash during calculation of pressure or density. Make it "value uniform 331.3"

First of all, thank you very much for your answer.
You are right, I should defined the "what" is the problem. The problem is, it does not crash, it just stays with the initial value. And according to your explanation, it is perfectly normal. I was just looking at the "initial" values to be sure it works since simulation takes too much time. I didnt knew that groovyBC takes action after initialization.

Thank you very much for your time,
Have a nice day.
Eren.

[gschaider]

Originally Posted by ErenC

First of all, thank you very much for your answer.
You are right, I should defined the "what" is the problem. The problem is, it does not crash, it just stays with the initial value. And according to your explanation, it is perfectly normal. I was just looking at the "initial" values to be sure it works since simulation takes too much time. I didnt knew that groovyBC takes action after initialization.

Thank you very much for your time,
Have a nice day.
Eren.

The reason is that during the construction of the boundary condition it is not sure that fields mentioned in the expressions are already constructed. Which would lead to a crash and users wouldn't be able to use perfectly reasonable expressions. With this groovyBC is usally evaluated the first time the variable is being solved for. Which usually is early enough. But there is an optional parameter evaluateDuringConstruction for groovyBC that forces an evaluation

[divinegabriel]

Your issue may be related to how you define variables in the code. You can try modifying the code as follows:

ini
groovyBC
{
type groovyBC;
variableName T;
value uniform 0;
valueExpression "(311.3+A*sin(pos().y*pi/L))";
variables "A=5" "L=6.69e-2";
}
In this code, variableName is the name of the temperature variable in your model. Additionally, you should check other parameters in your model to ensure that they are set correctly and are consistent with the boundary condition you want to apply.

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