|June 19, 2005, 21:19||
SU & SP: CFX 4.4 HELP!!!
I want to put source:
Source=R3-R2-R1 where R1, R2 and R3 represent different expressions. R1=+ive, R2=-ive, R3=+ive
At the moment, I am carrying out the following operation:
This is causing a divergence.
Does anyone have any other way of doing it!...I hope so...?
Thanks in Advance,
|June 27, 2005, 21:30||
Re: SU & SP: CFX 4.4 HELP!!!
The form of a source term, when solving for variable phi is as follows:
Source = SU + SP * phi
Since in your source term, you don't have any variables that are a function of the solved variable, phi, SP should be zero.
SU(INODE,IPHASE) = SU(INODE,IPHASE) + R3 - R2 - R1 SP(INODE,IPHASE) = SP(INODE,IPHASE) + 0.0
Use this if your source is mostly positive.
If (R3-R2-R1) is very negative, you may want to put this in the SP term by first dividing by phi (since the code will multiply it by phi later). This would be:
SU(INODE,IPHASE) = SU(INODE,IPHASE) + 0.0 SP(INODE,IPHASE) = SP(INODE,IPHASE) + (R3-R2-R1)/phi(INODE,IPHASE)
This will make the matrix more diagonally dominant when SP gets carried to the other side and incorporated into the matrix diagonal.
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