From reading this forum, I have found why the "Kernel Gradient Correction" is not implemented in the code.

But I have not found the reason for "Kernel Correction".

Can any one describe it to me?

Thanks

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## Comments

- close to free-surface

- at interfaces

- close to boundaries

So kernel corrections means basically "normalisation" so Wab / sumWab

But I think this process is not carried out during the solution. Right?

kernel is only used in some post-processing tools such as MeasureTool in order to obtain values when sum_wab is more than a minimum value...

in this way we avoid to obtain magnitudes if the number of neighbours is too low for example and we normalise the kernel if sum_wab>0.5 (by default)

In the post processing document, computing the velocity is:

V_a=sum (V_b*W_ab) / sum (W_ab)

So, this formulation is the "kernel correction". Right?

If the sum(W_ab) is less than 0.5, what would happen?

YESSSS

If the sum(W_ab) is less than 0.5, what would happen?

Then a DUMMY value will be used.

Generally we use ZERO (for velocity for example)

or -9999999 (for pressure)

See the attached picture.

Would you mind please explain it more?

Regards