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Tochnog is a GPLed CFD/ Multiphysics solver that seems to be less active since 2001. However, some people state that they used the code sucessfully for "stress analysis, diffusion and CFD".

The official homepage is hosted by

The capabilities at listed here, some exemplaric features are:

  • Implicit or explicit timesteping, Automatic time-stepping
  • Finite elements/Mesh refinement
  • Convection-diffusion equation, Navier Stokes, Solids deformations (e.g. Elasticity, Hypo-Plasticity, Damage, Thermal Stress, ...)
  • Error estimates
  • Automatic fluid-solid interaction
  • Static, quasi-static and dynamic analysis
  • Parallelization (e.g PETSc)
  • Inverse modeling (estimation of model parameters)
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