Hz/limiter

[HenrZu]

Positivity-Limiter from Gassner and Rueda-Ramírez based on https://arxiv.org/pdf/2102.06017.pdf.

• Implementation of the limiter for 1D and 2D
• 3D variant can be added. Needs only index adjustments.
• By calling "rhs!", a lot of memory is still allocated.

[HenrZu]

@sloede

[codecov[bot]]

Codecov Report

Merging #1040 (07a9a6d) into main (9c6b1ca) will decrease coverage by 0.94%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1040      +/-   ##
==========================================
- Coverage   93.91%   92.97%   -0.94%     
==========================================
  Files         291      296       +5     
  Lines       22550    22778     +228     
==========================================
  Hits        21177    21177              
- Misses       1373     1601     +228     

Flag	Coverage Δ
unittests	92.97% <0.00%> (-0.94%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
..._1d_dgsem/elixir_euler_positivity_gassner_rueda.jl	0.00% <0.00%> (ø)
..._2d_dgsem/elixir_euler_positivity_gassner_rueda.jl	0.00% <0.00%> (ø)
src/Trixi.jl	66.67% <ø> (ø)
.../callbacks_stage/positivity_alpha_rueda_gassner.jl	0.00% <0.00%> (ø)
...backs_stage/positivity_alpha_rueda_gassner_dg1d.jl	0.00% <0.00%> (ø)
...backs_stage/positivity_alpha_rueda_gassner_dg2d.jl	0.00% <0.00%> (ø)

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