integration over subdomain

Asked by Hossein Nili


I am solving an equation in one of two subdomains (in the other I set the value of the variable identical to a constant) and now want to find the average value of the solution over the subdomain (which has a sine-shaped outer boundary).

Is there particular syntax for integration over a subdomain. As far as I understood from the FEniCS book, the ds element and subsequent assemble command would integrate over the whole problem domain. Can we make this specific to a given subdomain?

Many thanks,

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Johannes Ring (johannr) said :

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