The cell gradient is limited to ensure that the face values obtained by extrapolating the cell value to the cell faces using the gradient are bounded by the neighbouring cells minimum and maximum limits.
As an example, consider the limiter to apply between cells P and N.
The value of \( \phi_P \) is extrapolated using the gradient at P to the cell face \( \phi_{f,e} \). When using a coefficient of 1, if the extrapolated value exceeds the value of the neighbour value \( \phi_N \) the gradient is scaled so as to achieve \( \phi_{N} \).
The scheme is specified using:
gradSchemes { default none; grad(U) cellLimited <scheme> <coefficient>; }
The coefficient should be specified in the range zero to one, where values of
Source code
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