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Old   February 20, 2012, 22:52
Default a few questions on filteredLinear2
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Abe H. Lee
Join Date: Nov 2011
Location: State College, PA. USA
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Hello Foamers:

I'm trying to use the interpolation scheme filteredLinear2. If I want to use filteredLinear2 on the divergence term then I believe the usage should look like:

div(phi,U) Gauss filteredLinear2 1 0;

It requires two coefficients (above the first coefficient is one and the second one is zero) and I think it is important that I assign appropriate values for the two coefficients. However, I'm not quite sure what values to choose when I want to run a LES case to study the flow over a cylinder at high Re.

I've looked into the source code and included some portion of the code description.

// Scaling corefficient for the gradient ratio,
// 0 = linear
// 1 = fully limited
scalar k_;

// Maximum allowed overshoot/undershoot relative to the difference
// across the face.
// On input:
// 0 = no overshoot/undershoot
// 1 = overshoot/undershoot equal to the difference across the face
// Note: After input 1 is added to l_

It seems like the first coefficient has something to do with limiter that is

0 = no limiter so it's just linear
1 = fully limited meaning it becomes like limitedLinear

Am I understanding it correctly? Please, correct me if I'm not.

Also about the second coefficient it says it has something to do with overshoot/undershoot, which I'm not quite sure what it is about.

Could anyone explain to me the details of the algorithm in filteredLinear2 and recommend appropriate values for the two coefficients?

vishwakarma, tiam and rajibroy like this.

Last edited by abelee; February 21, 2012 at 00:25.
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