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Introduction to Computational Fluid Dynamics (CFD) - page 14 / 47

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Modeling(boundary conditions)

Boundary conditions: No-slip or slip-free on walls, periodic, inlet (velocity inlet, mass flow rate, constant pressure, etc.), outlet (constant pressure, velocity convective, numerical beach, zero-gradient), and non-reflecting (for compressible flows, such as acoustics), etc.

No-slip walls: u=0,v=0

v=0, dp/dr=0,du/dr=0

Inlet ,u=c,v=0

Outlet, p=c

Periodic boundary condition in spanwise direction of an airfoil

o

r

x

Axisymmetric

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