Alberto,
have you taken a look at step-47? That's probably the program with the "purest" use of that class.
Best
 W.

On 12/16/20 11:50 AM, Alberto Salvadori wrote:
Dear community

I would like to have a few more details on the class FEInterfaceValues<dim> <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.dealii.org%2Fcurrent%2Fdoxygen%2Fdeal.II%2FclassFEInterfaceValues.html&data=04%7C01%7CWolfgang.Bangerth%40colostate.edu%7C26a50c358048457e382608d8a1f37ff2%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637437414485072776%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=1Fyvgd963Qh0vJjZq5RRtEBChAZAXCa0Tjs7ayAiYZg%3D&reserved=0>. since it is my feeling that FEInterfaceValues<dim> <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.dealii.org%2Fcurrent%2Fdoxygen%2Fdeal.II%2FclassFEInterfaceValues.html&data=04%7C01%7CWolfgang.Bangerth%40colostate.edu%7C26a50c358048457e382608d8a1f37ff2%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637437414485082802%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=wSWy88SFBciv5Qi6cwIdEbXHXTbRpe%2FwuF%2BGqUMwNjg%3D&reserved=0>
might be conveniently used for interfaces, even out of DG methods.

Specifically I'd like to figure out if this notion can be used without recurring to the MeshWorker::mesh_loop <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.dealii.org%2Fcurrent%2Fdoxygen%2Fdeal.II%2Fgroup__MeshWorker.html%23gab75fe399736977323bb319959ab66feb&data=04%7C01%7CWolfgang.Bangerth%40colostate.edu%7C26a50c358048457e382608d8a1f37ff2%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637437414485082802%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=AcVi0QtyMphSjCwJxLU3XjfntYNYPZt9A62%2FTdZ0OgM%3D&reserved=0>,
which I am not quite confident at present.

I'd like to play autonomously with the class FEInterfaceValues<dim> <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.dealii.org%2Fcurrent%2Fdoxygen%2Fdeal.II%2FclassFEInterfaceValues.html&data=04%7C01%7CWolfgang.Bangerth%40colostate.edu%7C26a50c358048457e382608d8a1f37ff2%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637437414485092771%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=sO2EXLTMRqhCBJKVmtg0f%2FM%2BqxYGafBWd0LdXo4qoYE%3D&reserved=0>
but unfortunately I cannot grasp the notion of subface, which is apparently
required by the reinit as in step 12:
 fe_iv.reinit <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.dealii.org%2Fcurrent%2Fdoxygen%2Fdeal.II%2FclassFEInterfaceValues.html%23af6aa20b6652c2605d4cee36021f6bcd2&data=04%7C01%7CWolfgang.Bangerth%40colostate.edu%7C26a50c358048457e382608d8a1f37ff2%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637437414485092771%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=S9u2Xv49A%2Fan0RyhBfE4EmR2%2FevhoF4coo%2BkTvt5GyU%3D&reserved=0>(cell, f, sf, ncell, nf, nsf);

Can anyone address me some reading on this notion and how it is dealt with
by the MeshWorker::mesh_loop <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.dealii.org%2Fcurrent%2Fdoxygen%2Fdeal.II%2Fgroup__MeshWorker.html%23gab75fe399736977323bb319959ab66feb&data=04%7C01%7CWolfgang.Bangerth%40colostate.edu%7C26a50c358048457e382608d8a1f37ff2%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637437414485102756%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=UqH1dDvZ0NLeU9IIt1FEy1hfJAxXluP2xYkaDlQocO0%3D&reserved=0> ?

I appreciate your help

Alberto





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Wolfgang Bangerth          email:                 bange...@colostate.edu
                           www: http://www.math.colostate.edu/~bangerth/

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