Jaekwang,

in step-9 the test function is a little bit strange because if you use 
continuous finite element to discretize the advection equation, the scheme 
is unstable. So you basically add a diffusion term to the equation to 
stabilize the scheme. However, your equation already has a diffusion term 
so you may not need a stabilization term.

Best,

Bruno

On Wednesday, June 14, 2017 at 3:33:18 PM UTC-4, Jaekwang Kim wrote:
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