|February 20, 2012, 22:52||
a few questions on filteredLinear2
Abe H. Lee
Join Date: Nov 2011
Location: State College, PA. USA
Posts: 2Rep Power: 0
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
// 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?
Last edited by abelee; February 21, 2012 at 00:25.
|Thread||Thread Starter||Forum||Replies||Last Post|
|calculation of test filter quantites for desired parameters(equations) in les||mrn||FLUENT||0||July 15, 2010 05:04|
|A new test harness for OpenFOAM||mbeaudoin||OpenFOAM Announcements from Other Sources||0||June 17, 2010 10:36|
|OF 1.6 | Ubuntu 9.10 (64bit) | GLIBCXX_3.4.11 not found||piprus||OpenFOAM Installation||22||February 25, 2010 14:43|
|Combustion Test Case||A.S.||Main CFD Forum||1||May 31, 2005 09:22|
|test cases||Maciej Matyka||Main CFD Forum||3||November 24, 2004 09:27|