[jeroendemto]

Hello everyone!

As the title states I'm trying to imply a time dependant gradient as a boundary condition. You can find the formula I'm trying to implement on the boundary as attachment. The method I tried is using uniformFixedGradient and use an uniform value which is a polynomial. This looks as follows:

    inlet
    {
        type        uniformFixedGradient;
        uniformValue polynomial ( (-2.82*T[0] 0.5));
    }

I know the meshid of the cell I want to imply the boundary condition is the first cell, hence the T[0].
However I get the following error code

keyword uniformGradient is undefined in dictionary "/0/T.boundaryField.inlet"

file: /0/T.boundaryField.inlet from line 25 to line 26.

    From function const Foam::entry& Foam::dictionary::lookupEntry(const Foam::word&, bool, bool) const
    in file db/dictionary/dictionary.C at line 570.

FOAM exiting

It seems like I'm using the wrong type, but I don't know which other type I have to use.

Kind regards,
Jeroen

[tomf]

Hi Jeroen,

Personally I have not used this boundary condition, but the error message that you get is quite clear:

keyword uniformGradient is undefined in dictionary "/0/T.boundaryField.inlet"

Which is correct as you have specified:

uniformValue polynomial ( (-2.82*T[0] 0.5));

So if you change the uniformValue to a uniformGradient at least this error should go away.

Best Regards,
Tom

[ahmmedshakil]

Originally Posted by jeroendemto

Hello everyone!

As the title states I'm trying to imply a time dependant gradient as a boundary condition. You can find the formula I'm trying to implement on the boundary as attachment. The method I tried is using uniformFixedGradient and use an uniform value which is a polynomial. This looks as follows:

    inlet
    {
        type        uniformFixedGradient;
        uniformValue polynomial ( (-2.82*T[0] 0.5));
    }

I know the meshid of the cell I want to imply the boundary condition is the first cell, hence the T[0].
However I get the following error code

keyword uniformGradient is undefined in dictionary "/0/T.boundaryField.inlet"

file: /0/T.boundaryField.inlet from line 25 to line 26.

    From function const Foam::entry& Foam::dictionary::lookupEntry(const Foam::word&, bool, bool) const
    in file db/dictionary/dictionary.C at line 570.

FOAM exiting

It seems like I'm using the wrong type, but I don't know which other type I have to use.

Kind regards,
Jeroen

Hi Jeroen,
You can use groovyBC boundary conditions, which comes with swak4Foam, for your case.

Shakil