Hi Dmitry,

strange, I didn't get notified about your access request. Anyway, I set your 
personal project count to 10 so that you can fork.

Concerning the finger length, I'll believe anything as I'm not an expert. Maybe 
someone else can jump in?

Kind regards
Bernd

________________________________
Von: Dmitry Pavlov <[email protected]>
Gesendet: Dienstag, 17. November 2020 19:15:50
An: DuMux User Mailing List; Flemisch, Bernd
Betreff: Re: [DuMux] 1p and symmetry


Bernd,


it would be nice if you could share with us what you had to change to make 
things work with Float128. Ideally, you would fork the corresponding repository 
and create one or several merge requests like described here:


I was about to make the merge request, but apparenly I can not fork the dumux 
repo until I am given some privileges in the project. I pushed the "request 
access" button and will see how it goes.


With "seems to work", do you mean that the irregularities vanish?

No, I just meant that the code compiles and runs. I am yet to see whether I am 
able to set the residual criterion that makes the irregularities sufficiently 
small for the time of simulation, and, at the same time, allows the method to 
converge at all. That turned out to be impossible with regular 64-bit floats. I 
will continue attempts.


If you want to quantify the influence of physical parameters on the fingers, 
you have to apply measures that don't depend on the numerical setting like grid 
size or solver thresholds. Which is probably something like onset time, finger 
length and things like that, but I'm certainly no expert here.

Oh, finger length certainly depends on grid size in my simulations. With the 
grids I was able to try, anyway. The finer the grid, the thinner and faster are 
the fingers. Maybe I have not yet reached the grid resolution at which it is no 
longer the case. In fact, finger length seems to be depending on everything 
(except maybe the time step, though I am not 100% sure).



Best regards,

Dmitry

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