Function input feature for time-dependent boundary conditions

[kharold23]

Current situation

Closes #89

Release Notes

• Added a new parameter fn to flow and pressure boundary conditions that takes in a string
• Interprets the string as a function of time, represented by the variable t
• The value of the boundary condition is calculated at each time step by evaluating the function at t = the current time value.

Documentation

Time-dependent boundary conditions can now be input using a function passed in as a string. The function is of the variable t, or time. For example:
"bc_values": { "fn": "2.0 * (4*atan(1.)) * COS(2.0 * (4*atan(1.)) * t)" }

Testing

Test case test_time_dependent_block added to test_io.py, which runs json files timeDep_Flow.json and timeDep_Pressure.json.

Code of Conduct & Contributing Guidelines

• I agree to follow the Code of Conduct and Contributing Guidelines.

[ktbolt]

I ran the pulsatileFlow_CStenosis_steadyPressure case on Ubuntu 22 and got the following exception

terminate called after throwing an instance of 'std::runtime_error'
  what():  Maximum number of non-linear iterations reached.

You need to add catching exceptions in the Python testing code.

[ktbolt]

We don't want to mix external software with our source code so the exprtk.hpp file should not be in svZeroDSolver/src/. We need to add a ThirdParty directory and put the exprtk.hpp file in a sub-directory of it.

[ktbolt]

Also I see that there is Docker container file in svZeroDSolver/container/profiling for Ubuntu 22, you can use this to test I think.

[codecov]

Codecov Report

Attention: Patch coverage is 74.69880% with 21 lines in your changes missing coverage. Please review.

Project coverage is 25.12%. Comparing base (688cece) to head (e6760c6).

Files	Patch %	Lines
src/solve/SimulationParameters.cpp	73.80%	11 Missing ⚠️
src/model/Parameter.cpp	65.51%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #108       +/-   ##
===========================================
- Coverage   79.25%   25.12%   -54.14%     
===========================================
  Files          52       53        +1     
  Lines        2179    15401    +13222     
  Branches      278     1405     +1127     
===========================================
+ Hits         1727     3869     +2142     
- Misses        452    11532    +11080     

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[menon-karthik]

Almost ready! Just some minor comments.