Do not understand SimpleFOAM algorithm in OpenFOAM
(1)Guess the pressure field p*
Solve the momentum equations to obtain u*,v*,w* Solve the p' equation (continuity) Correct pressure field p =p*+p' Calculate the velocity corrections u', v', w' Correct velocity field u =u*+u', v =v*+v' w =w*+w' Treat the corrected pressure pas a new guess p* and go toI do not know how we can find p' from continuity? 
Mr. Peric is your friend. He wrote full book explaining exactly what you asked.

I cannot find his book.Can you give me ebook or a link?

read the book by Versteeg and Malalasekera.

The code follows the dissertation of Jasak. Check his dissertation and walk through the code with his equations and explanations.

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