FESTIM meeting

July 2024

Agenda

🧑‍💻General updates

v1.3 on the way
SurfaceKinetics merged in main
Proof of concept for interfaces in dolfinx and implications for FESTIM2
New derived quantities in fenicsx

📖V&V online book: status update (Jair Santana)

if time:

Neutron induced trap model (James Dark)

POSE activities

FESTIM 1.3 is round the corner

`SurfaceKinetics` is merged in main (will be in 1.3)

Outstanding V&V effort from Vladimir Kulagin
Check out the V&V repository github.com/KulaginVladimir/FESTIM-SurfaceKinetics-Validation
First ever verification case on surface models
4 validation cases including cross checks with MHIMS and TESSIM-X
Did someone say reproducible?

Interface discontinuity is working in dolfinx! But....

2 materials
1 mobile + 1 trap

Example dolfinx code available in issue #719

But this changes a lot of things!

FESTIM 1

with dolfinx

1 mesh for the whole domain

Submesh 1

Submesh 2

VectorFunctionSpace \(V\) (eg. 3 components)

Function \(u\) (eg. 3 components)

VectorFunctionSpace \(V_1\)

\(V_2\)

Function \(u_1\) (eg. 2 comps.)

\(u_2\) (eg. 3 comps.)

1 function for the whole domain

1 function per subdomain

Pros and cons

Pros

Solves the "wasted dofs" issue (when a trap isn't defined in all subdomains)
No need for change of variable

Cons

Complicates the implementation of pretty much everything
Each species now has several functions/test functions...
May need a surface-to-volume connectivity map?

We have no choice anyway!

Who wants to start? ✋

New derived quantities in `fenicsx`

Thank you to Jonathan Dufour 👏👏
May need a rework because of discontinuities... 🙄

On to Jair Santana for....