Cross linking is (I think) where you form a clathrate type gel with some other fluids: gas hydrates being a common one. At the basic level it's chemisty, but the mechanism is much more complex. So, you may be looking at chemistry, or you may need UDFs and sink/source terms. I can guide, but only in general terms or solver terms: the PhD you may be embarking on to model clathrates is for you to do! ;)
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