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有关of的壁面法向导数的精度。

OpenFOAM

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#1
对于第一类边界条件，OF里面壁面法向导数只有一介精度吧？
```
Foam::tmp<Foam::Field<Type> > Foam::fvPatchField<Type>::snGrad() const
{
return (*this - patchInternalField())*patch_.deltaCoeffs();
}
```
请问有没有二阶精度的sngrad?
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