Unsteady Boundary Conditions -- CFD Online Discussion Forums

November 26, 1999, 11:50	Unsteady Boundary Conditions	#1
James Date Guest Posts: n/a	Hi, Could anyone tell be if they have had any experience using unsteady boundary conditions in CFX4.2 using the USRBCS FORTRAN routine. I'm interested in modelling an NACA0012 aerofoil with a transient inflow boundary condition. So far i've managed to implement an oscillating inflow condition in the USRBCS FORTRAN routine and obtained transient solutions. However, when you look at the dump file after a no of periods there doesn't seem to be any downstream wake response.The Lift & Drag force's are changing. Could someone shed some light on these initial findings? Am i doing someting fundamentally wrong!! Regards James Date

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