Pencil Code office hours

[Axel Brandenburg]

Hi all,
The next office hours will be tomorrow, Wednesday 7 January, at 13:00 CET; see

https://norlx65.nordita.org/~brandenb/pencil-code/office_hours/

also for future dates. As usual, we begin by asking for issues to be discussed,
put them then in some suitable order, and allocate by default 10 min for each one.
Cheers, Axel

[Axel Brandenburg]

Dear all,
The office hours will be in 60 min. See you then.
Axel

[Axel Brandenburg]

Our number is, as usual:

https://stockholmuniversity.zoom.us/j/69160607217

Axel

[Matthias Rheinhardt]

Hi all,

apart from general freezing BCs 'f' and 'fg', we have special freezing of the magnetic field via 'fB' and 'fBs', but when looking up its "freezing effect", it does not more than setting the resistive emf fres at the boundary to zero, not the whole rhs of the induction equation. This doesn't fulfil any physical purpose in my view. Any ideas why it was introduced in the first place?

Best greetings,

Matthias