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ldu matrix, ldu addressing

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Old   December 7, 2013, 13:40
Default ldu matrix, ldu addressing
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within method

surfaceSum (const GeometricField<Type, fvsPatchField, surfaceMesh>& ssf)
is found

163* const labelUList& owner = mesh.owner();
where method owner() is

const labelUList& owner() const  //Internal face owner.
return lduAddr().lowerAddr(); //Return ldu addressing. //Return lower addressing.
My questions are about the ldu matrice of fvmesh. Questions:
1. I have read the article:

In chapter 2.2 it is written that a 9 cell mesh has 91 matrice coefficients. This means nine coefficients per cell. Is it that the coefficients are 8 for the surface centers and 1 for the cell center? (I am just guessing here )

2.Am I right, that with method owner first the ldu matrix of fvmesh mesh is returned with lduAddr() and afterwards the lower triangle of this matrice is returned with lowerAddr()?
Furthermore, does ldu addressing just mean that we select different parts of the ldu matrice by this methods?

3. When calling owner() on fvmesh mesh what are the coefficients saved in the fvmesh mesh matrice, to be more precise what physical dimension do the coefficients represent?

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