In COMSOL, I have a flat plate with an irregular surface. Flux of a dilute species is occurring across the irregular surface boundary (in 2D) and I'm looking to define the concentration of the dilute species at the boundary. However, the concentration is not a set value and changes with the y position on the boundary (relative to a fixed point in the geometry).
I have the equation created as a variable in COMSOL, but when I try to call the variable in the concentration tab under the TDS module, the program gives me an error. I know that the setup is correct, because when the concentration is a fixed value, the program converges. What I need help with is making the concentration a variable and not a parameter. My COMSOL experience is limited so, I appreciate any help I can get. Thank you.
You can find lot of tutorial in Youtube to enhance your experience In comsol.
like: https://youtu.be/FX2rCdgNmHQ
Hi Anna,
Go to "Global definitions" -> "Analytic". Choose a function name (for future reference I will call it"TheNameYouGave") and define your expression (something like "10*y", which is a function proportional to the y-coordinate). In "Arguments" type "y". In "Units" -> "Arguments" you should have something like mm, m, depending on your geometry. In "Units" -> "Function" you might want the function output in mg/mm^3 (or any other concentration unit you want).
You can then use the function as a, e.g., boundary condition if you write: "TheNameYouGave(y)"
Hope this helps
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