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New time dependent boundary condition

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Old   May 12, 2016, 04:36
Default New time dependent boundary condition
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Jigar Parekh
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Hello everyone,

I am trying to develop a new boundary condition which is a modified version of a fixed BC. Here, I also read a scalarField H as follows :

top
{
type newBC;
value uniform 101329;
H uniform 0.0;
}


After reading this scalarField H, I update it (by adding some constant to itself) for each time step in the newBC.C file as follows :

H += someConstantScalarField; ... (1)

And then I use this H to compute the value at this boundary.

The problem is that, since I am using a PIMPLE solver, if I use (1) it updates it for all the iterations of the PIMPLE loop of that particular time step. In other words, I want to perform (1) just once for a time step and use that updated H for all the PIMPLE iterations within this time step. Something like :

// if(time step is changed)
{
H += someConstantScalarField; ... (1)
}

I think it can be done. Since I am new to OpenFOAM I am not able to figure it out. Kindly, let me know if you have any suggestions.
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