changing physics interface.

[cmhamel]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.46%. Comparing base (4a75c41) to head (66974af).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Functions.jl	0.00%	2 Missing ⚠️
src/assemblers/SparseMatrixAssembler.jl	0.00%	1 Missing ⚠️
src/bcs/BoundaryConditions.jl	0.00%	1 Missing ⚠️
src/ics/InitialConditions.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #206      +/-   ##
==========================================
- Coverage   74.56%   74.46%   -0.11%     
==========================================
  Files          49       49              
  Lines        2139     2142       +3     
==========================================
  Hits         1595     1595              
- Misses        544      547       +3     

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