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How to modify gradient specification for fixedGradient b.c. during simulation

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Old   October 6, 2017, 11:48
Default How to modify gradient specification for fixedGradient b.c. during simulation
  #1
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I want to modify boundary conditions during a simulation from inside a custom solver (derived from pimpleFoam) without creating my own custom boundary condition type.

So far I have been successful for fixedValue boundary conditions. I managed this by using, for example

Code:
type fixedValue;
value uniform (0 0 0);
in the 0/U file. Then, during the simulation I modify the boundary values from inside my custom solver using

Code:
int index = 0;

forAll( U.boundaryFieldRef()[boundary_label(patchName)], i )
{
    for ( int j = 0; j < 3; j++ )
    {
        U.boundaryFieldRef()[boundary_label(patchName)][i][j] = velocityBC[index];
        index++;
    }
}
Thus, for a fixedValue b.c. I managed to modify the specification of "value". How can I do the same for the specification of "gradient" for a fixedGradient b.c.?
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Old   June 30, 2020, 07:57
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RGS
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Rohit George Sebastian
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Quote:
Originally Posted by mtgoncalves View Post
I want to modify boundary conditions during a simulation from inside a custom solver (derived from pimpleFoam) without creating my own custom boundary condition type.

So far I have been successful for fixedValue boundary conditions. I managed this by using, for example

Code:
type fixedValue;
value uniform (0 0 0);
in the 0/U file. Then, during the simulation I modify the boundary values from inside my custom solver using

Code:
int index = 0;

forAll( U.boundaryFieldRef()[boundary_label(patchName)], i )
{
    for ( int j = 0; j < 3; j++ )
    {
        U.boundaryFieldRef()[boundary_label(patchName)][i][j] = velocityBC[index];
        index++;
    }
}
Thus, for a fixedValue b.c. I managed to modify the specification of "value". How can I do the same for the specification of "gradient" for a fixedGradient b.c.?



Hi,

Did you manage to figure out how to do this? I am trying to do something similar.


Thanks!
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boundaries condition, boundary variable, time vayring bc

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