dear all,

anyboy send some reference to me? thanks a lot.

There is no special difference in BC between FVM and FDS implementation, except that FVS is convinient to impose BC flux condition. Usually a row of Ghost Cell outside the computaional domain is supplemented so that the physical BC is met. e.g. on no-slip wall, U=0 is physical BC, then the velocity in Ghost cell meets (U_0+ U_1) /2 =0, where U_1 is neighbouring inner cell.

a question in this context... Is it an absolute death to fv method using simpler/simple if someone (actually me)less farsighted accidentally places pressure nodes on a wall.....

thanks for your help another question is that as you said the ghost cell is described U_0 and the first inner cell is U_1, is there grid point at solid wall?

The wall is the interface between Mesh cell 0 and 1. No solution variable is located on the Wall.