SimVascular/svZeroDSolver

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A C++ lumped-parameter solver for blood flow and pressure in hemodynamic networks

Stars: 22
Forks: 44
Open beginner issues: 0
Indexed issues: 39

Dominant language: C++
License: BSD-3-Clause
Last GitHub push: Sep 9, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

Open All

39 open issues indexed

Convergence issues with more complex test cases containing ChamberSphere Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

SimVascular/svZeroDSolver#246 · Opened Sep 18, 2026
Strain-dependent active stress model Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 48/100

SimVascular/svZeroDSolver#244 · Opened Sep 2, 2026
Incomplete Implementation for Windows OS in svzerodsolver.cpp: Reads input files but does not save path for output.csv Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

SimVascular/svZeroDSolver#238 · Opened Jul 9, 2026
Solver divergence with large quadratic resistances. Open

bug

Difficulty 5/5 Over a week Newbie friendliness 35/100

SimVascular/svZeroDSolver#237 · 2 comments · Opened Jul 2, 2026
Add AGENTS.md Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

SimVascular/svZeroDSolver#232 · Opened Jun 5, 2026
Optional valve-state freezing for piecewise valves to prevent Newton cycling with 3D-0D coupling Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SimVascular/svZeroDSolver#228 · 9 comments · Opened May 21, 2026
Replace ClosedLoopHeartPulmonary with individual blocks Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

SimVascular/svZeroDSolver#218 · 3 comments · Opened Mar 26, 2026
Extend cycle to cycle error check for closed-loop models Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

SimVascular/svZeroDSolver#212 · Opened Feb 6, 2026
The tests/cases JSON description of test case is useless Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 48/100

SimVascular/svZeroDSolver#211 · Opened Jan 15, 2026
The external_coupling_block error does not show the invalid type Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 48/100

SimVascular/svZeroDSolver#209 · Opened Dec 18, 2025
Minor feature request: streaming SAX reader for json input files Open

enhancement

SimVascular/svZeroDSolver#207 · 4 comments · 1 assignee · Opened Dec 4, 2025
Chamber: add feature to set material model in input file Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SimVascular/svZeroDSolver#200 · 1 comment · Opened Nov 14, 2025
Eigen CMake issue causing build errors in svMultiPhysics integration tests Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

SimVascular/svZeroDSolver#190 · 1 comment · Opened Sep 25, 2025
Calibrator: add calibration for Chamber Sphere block Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

SimVascular/svZeroDSolver#188 · Opened Sep 17, 2025
Add Chamber model with nonlinear filling behavior Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

SimVascular/svZeroDSolver#187 · Opened Aug 15, 2025
Default build type: Release or Debug? Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 38/100

SimVascular/svZeroDSolver#185 · 6 comments · Opened Jul 17, 2025
Improve terminal error messages for svzerodsolver Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

SimVascular/svZeroDSolver#183 · Opened Jun 22, 2025
Simplify input files Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 30/100

SimVascular/svZeroDSolver#167 · 2 comments · Opened Apr 17, 2025
Add python-based tuning of models Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

SimVascular/svZeroDSolver#158 · 4 comments · Opened Mar 31, 2025
Calibrator: Automatically generate test cases Open

enhancement good first issue

SimVascular/svZeroDSolver#154 · 1 assignee · Opened Mar 26, 2025
Add simple blocks Open

enhancement good first issue

SimVascular/svZeroDSolver#151 · 1 comment · 1 assignee · Opened Mar 25, 2025
Catch solver exceptions Open

enhancement good first issue

Difficulty 3/5 1-2 days Newbie friendliness 38/100

SimVascular/svZeroDSolver#150 · 1 comment · Opened Mar 20, 2025
Addition of spherical left ventricle model with growth and remodeling Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

SimVascular/svZeroDSolver#144 · 1 comment · 1 reaction · Opened Feb 6, 2025
Initial conditions should have instructions & be selectable for all variables Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

SimVascular/svZeroDSolver#141 · 4 comments · Opened Dec 4, 2024
output auxiliary variables for chamber blocks Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SimVascular/svZeroDSolver#138 · Opened Oct 16, 2024
Clean up the GitHub Pages documentation Open

enhancement

SimVascular/svZeroDSolver#136 · 2 comments · 1 assignee · Opened Oct 12, 2024
Add Impedance boundary condition Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

SimVascular/svZeroDSolver#135 · Opened Oct 10, 2024
Error message needed for python interface Open

enhancement

SimVascular/svZeroDSolver#119 · 1 assignee · Opened Aug 14, 2024
Input files generated from API use "internal_junction" instead of "NORMAL_JUNCTION" Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

SimVascular/svZeroDSolver#106 · 2 comments · Opened Mar 6, 2024
Documentation for external_solver_coupling blocks Open

documentation enhancement

SimVascular/svZeroDSolver#104 · 1 assignee · Opened Feb 20, 2024
Add interface to code coverage and combine tests Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

SimVascular/svZeroDSolver#103 · 1 comment · Opened Feb 15, 2024
We should test time integration in simple test cases Open

good first issue

SimVascular/svZeroDSolver#99 · 1 assignee · Opened Feb 12, 2024
Add all 72 0D models from pfaller22 Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

SimVascular/svZeroDSolver#96 · Opened Jan 23, 2024
Allow flow and pressure blocks to take time-dependent functions Open

enhancement good first issue

SimVascular/svZeroDSolver#89 · 1 assignee · Opened Dec 12, 2023
Unify attribute names? Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 30/100

SimVascular/svZeroDSolver#85 · 1 comment · Opened Dec 8, 2023
Require all source code files to be included in Doxygen documentation Open

documentation enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SimVascular/svZeroDSolver#80 · Opened Dec 2, 2023
Allow user-provided dependencies Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 42/100

SimVascular/svZeroDSolver#60 · 2 comments · Opened Nov 2, 2023
Improve the usability of the interface code Open

enhancement

SimVascular/svZeroDSolver#52 · 2 comments · 1 assignee · Opened Oct 18, 2023
Register with PyPi Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SimVascular/svZeroDSolver#44 · 3 comments · Opened Sep 23, 2023

SimVascular/svZeroDSolver

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