# [difference ; SIP, CGS ?]

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 August 24, 2001, 04:15 [difference ; SIP, CGS ?] #1 name Guest   Posts: n/a hi all. Strongly Implicit Procedure, Conjugate Gradient. Which one is better ? (I need faster solver...) thx.

 August 25, 2001, 11:54 Re: [difference ; SIP, CGS ?] #2 PCCG-SIP Guest   Posts: n/a Depends on the problem at hand. I would suggest learning about each solver (there is a e-book 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 on-line somewhere... (An introduction to the conjugate gradient method without the agonizing pain by Jonathan Shewchuk)

 August 25, 2001, 21:06 Re: [difference ; SIP, CGS ?] #3 Abhijit Tilak Guest   Posts: n/a 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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