2nd order boundary conditions for 2nd order discretization? -- CFD Online Discussion Forums

December 3, 2011, 11:38	2nd order boundary conditions for 2nd order discretization?	#1
quarkz Senior Member TWB Join Date: Mar 2009 Posts: 402 Rep Power: 19	Hi, I am now using 2nd order time and space discretization for my NS eqns, using fractional step. For the boundary conditions, e.g. at the north side, I'm using: du/dy = 0. v=0. If I just use a 1st order discretization of the above for my problem, it will be: u(i,j) = u(i,j-1) will it affect the overall order of my problem? Will it become overall 1st order? Thanks

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