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-   -   help with rAU variable...icoFoam, (http://www.cfd-online.com/Forums/openfoam-pre-processing/94556-help-rau-variable-icofoam.html)

rvmedina20 November 18, 2011 21:42

help with rAU variable...icoFoam,
 
Dear all,

I am trying to understand what the rAU variable does in the code. It is defined in the UEquation and also used to calculate the pEqn (the velocity and pressure of incompressible fluid flow). Can anybody help me understand what this variable means? Thanks

it is defined as in the UEqn source code as:

rAU = 1.0/UEqn.A()

nimasam November 23, 2011 03:42

look at here:
http://www.cfd-online.com/Wiki/Veloc...ssure_coupling
or a reference cfd book to see how piso or simple Algorithm works
but in brief
A() returns the diagonal part of matrix of U, so rUA is the inverse of diagonal part

Bernhard November 23, 2011 04:28

A good reference for these kind of questions in the PhD thesis by Jasak: http://powerlab.fsb.hr/ped/kturbo/Op...jeJasakPhD.pdf

rvmedina20 December 8, 2011 20:25

Sorry for late response. But Thank you!!

Quote:

Originally Posted by nimasam (Post 333217)
look at here:
http://www.cfd-online.com/Wiki/Veloc...ssure_coupling
or a reference cfd book to see how piso or simple Algorithm works
but in brief
A() returns the diagonal part of matrix of U, so rUA is the inverse of diagonal part


rvmedina20 December 8, 2011 20:26

Thank you Bernhard!!!

Quote:

Originally Posted by Bernhard (Post 333222)
A good reference for these kind of questions in the PhD thesis by Jasak: http://powerlab.fsb.hr/ped/kturbo/Op...jeJasakPhD.pdf



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