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Fixed boundary condition

This kind of boundary condition fits for those environment values that do not change with time and physical processes well interior to the simulation region. If the physical process concentrates in the center of the simulation region and causes very little influence on the boundary, and at the same time, the surrounding environment of the simulation region is stable, then we can set the boundary to fixed boundary conditions.

f(xb)=f0 (55)

where f(xb) is the boundary value, f0 is a fixed value.