About Poisson equation's B.C. in SMAC algorithm
 

I am using SMAC algorithm and LES model to simulation flat plate boundary layer and flow pattern around bluff body. But I could I impose boundary condition for Poisson equation?
The variable in Poisson equation could be thought to be pressure Incremental, It seems its B.C. is not the same with pressure B.C. in MAC algorithm.
By the way, if any friend have some papers about Poisson's B.C. in SMAC algorithm, I'll appricieat if you share them with me.
Thank you for you kindly help~
snake