[difference ; SIP, CGS ?]
hi all. Strongly Implicit Procedure, Conjugate Gradient. Which one is better ? (I need faster solver...) thx.

Re: [difference ; SIP, CGS ?]
Depends on the problem at hand. I would suggest learning about each solver (there is a ebook online here somewhere Templates of Liner solvers or somthing like that).
I see alot of Stone solvers in SIMPLE Codes... More and More I am seeing the use of Conjugate Gradient as a preconditioner then the stone algorithm is applied... there is a good tutorial of congugate gradients online somewhere... (An introduction to the conjugate gradient method without the agonizing pain by Jonathan Shewchuk) 
Re: [difference ; SIP, CGS ?]
Hi,
Neither of what u said is as good as MSIP, Modified Stone's Solver by Schnider & Zedan. Phoenics uses MSIP for Pres. Correction equation. CGS/PCGS can be used for P' equation bcos the coeff matrix is symmetric. for Momentum/energy equn's the upwinding & other host of schemes will destroy symmetry of coeff matrix. CGS is not applicable directly then. Hope this helps Abhijit 
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