Algebraic Model for Variance - grid size surface field
I have a rhoPimpleFoam solver which solve the equation for an extra scalar equation c (progress variable) and an algebraic equation for its variance.
The model for the variance is var (c) = a * (Delta X)^2 * (grad (c))^2
where the Delta X is the grid size, a is a constant (0.08333) and grad (c) is the gradient of C field.
The solver upload the data for progress variable (which goes from 0 to 1) and variance (which goes from 0 to 0.25) from a two dimensional table .
Table looks like:
Variance PV other variables
My questions are the following:
1) I defined the grid size field in the following way and I would like to know if it's correct
GridSize = mesh.surfaceInterpolation::deltaCoeffs();
2) My secondo question is:
considering the equation for the variance:
VarC.internalField() = pow((GridSize.internalField(),2)*0.08333*magSqr(fv c::grad(C));
when I run the simulation, after a few iterations, the variance goes out of bound (despite I impose to stay inside the limit of 0-0.25) and the simulation crashes soon.
Is that have something to do with the gridsize definition?
thanks for the help
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