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transport equation

How to set boundary conditions for Transport Equation with closed boundary?

Submitted by dolken on

Hi Everyone,

 I have a modeling problem.  It finally goes to drug flows inside a tute of one dimension. The speed of the drug flow is constant. The initial condition is know. The tube is closed, which means no exterior drug flows into the tube and the drug can not flow outside of the tube. Does anyone know how to set up the boundary conditions in mathematical formula? Thanks a lot.