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I want to know how can I solve a system of PDEs in COMSOL when the internal boundary is defined by another PDE.

More specifically consider this, where B is moving with time: (Lap means Laplacian)

dc1/dt = Lap (c1) , A < x < B : 1st PDE is defined between boundaries A and B.

dc2/dt = Lap (c2) , B < x < C : 2nd PDE is defined between boundaries B and C.

dc1/dx = k dc2/dx , at B : 3rd PDE defines the position of boundary B.

This is a simulation of two way internal oxidation in metals.

Thanks

Kamran

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# COMSOL - moving boundary - internal oxidation

Can you offer guidance or do you also need help?

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