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stokes_2014_fsu.pdf
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Finite Elements for the Steady Stokes Equations
John Burkardt
Department of Scientific Computing
Florida State University
..........
12:30-1:45, 23 June 2014
ISC 5907
..........
http://people.sc.fsu.edu/∼jburkardt/presentations/...
stokes 2014 fsu.pdf
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Fluid Flow Problems and Fluid Flow Solvers
Deal.II Fenics
FreeFem++ Ifiss
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INTRO: Equations of Fluid Motion
The equations that describe fluid flow are more complicated, in a
number of ways, than what we have seen for model problems such
as the Poisson equation in 1 or 2 dimensions.
Let’s take a look at a standard model for fluid flow, the
time-dependent Navier-Stokes equations.
We’ll simplify this system as much as possible, to the steady
Stokes equations, which are still complicated enough to introduce
some of the ideas you need in order to apply the finite element
method to fluid flow.
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FEM NAVIER STOKES
Equations of Fluid Motion
A Finite Element Formulation
Computing Basis Functions
Assembling the Matrix
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EQUATIONS: The Navier Stokes Equations
Any study of fluid flow starts with the Navier-Stokes equations:
ρv
t
− ρν∆v + ρ(v · ∇)v + ∇p =f (momentum equations)
ρ
t
+ ∇ · (ρv) =0 (continuity equation)
This is a relatively simple version!
We could add compressibility, heat transfer, turbulence.
Notice our hidden friend the (time dependent) Poisson equation:
ρv
t
− ρν∆v = f
v is the 1D/2D/3D velocity vector: u, or (u,v) or (u,v,w);
p is the pressure;
ρ is the (constant?) fluid density;
ν is the kinematic viscosity (stickiness);
f represents body forces such as gravity.
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