M. Manzan et G. Comini, INFLOW AND OUTFLOW BOUNDARY-CONDITIONS IN THE FINITE-ELEMENT SOLUTIONOF THE STREAMFUNCTION VORTICITY EQUATIONS, Communications in numerical methods in engineering, 11(1), 1995, pp. 33-40
The appropriate specification of boundary conditions is the main diffi
culty in the finite element solution of the streamfunction-vorticity e
quations for two-dimensional incompressible laminar flows. In this con
text, we show that the appropriate specification of both the outflow a
nd the inflow boundary conditions is required for the successful model
ling of two well known test problems.