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How to avoid discontinuity in initial and boundary condition

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Old   February 7, 2020, 07:49
Default How to avoid discontinuity in initial and boundary condition
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I am trying to solve a 1D transport problem in COMSOL.
Initial condition = 0
Boundary condition = 86 M

This creates a discontinuity at the x position 0. I understand a step function can be used to avoid the discontinuity. But I am not sure how the step function has to be defined. Should it be specified in the initial condition tab?

Any suggestion on how to do this will be really helpful
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boundary condition, comsol 5, discontinuity, initial condition, step function

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