No ignition (Fluent)

- April 17, 2023 at 6:31 pm
  
  Marcel Mikołajczyk
  Subscriber
  
  Hello
  
  I am facing problem while simulating shock tube detonation (2d, transient, no inlets, no outlets)
  
  After reflection of the wave at the wall there should be ignition or even detonation, however in my case the fractions of species remain the same in domain through whole simulation. I am using Hydrogen (2004) reaction mechanism from this page:https://www.universityofgalway.ie/combustionchemistrycentre/mechanismdownloads/
  I am using Reaction Mechanism, Theromdynamics and Transport for "Import CHEMKIN Mechanism" in Fluent(Species) as .txt - is it ok? What is the problem of no ignition?
  
  Moreover my residuals do not converge, what can I do besides mesh? Energy, y-velocity and h2o2 are above 1e+0 from beginning and after reflection everything ramps
- April 18, 2023 at 11:12 am
  
  Rob
  Ansys Employee
  
  Depending on which model(s) you're using you may need to patch a small region of high temperature or some product species into the domain: check the Users Guide for which.
- April 18, 2023 at 11:13 am
  
  Essence
  Ansys Employee
  
  Hi,
  The extension files of CHEMKIN mechanism is .inp, .thermo and .dat. Try to open in these formats.

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