{"id":39349,"date":"2019-12-03T07:40:07","date_gmt":"2019-12-03T07:40:07","guid":{"rendered":"\/forum\/forums\/topic\/chemkin-singular-jacobian-error-no-solution-found-particle-solver-error-changing-initial-guess\/"},"modified":"2019-12-03T07:40:07","modified_gmt":"2019-12-03T07:40:07","slug":"chemkin-singular-jacobian-error-no-solution-found-particle-solver-error-changing-initial-guess","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/chemkin-singular-jacobian-error-no-solution-found-particle-solver-error-changing-initial-guess\/","title":{"rendered":"Chemkin- Singular Jacobian error, No solution found, Particle solver error, Changing initial guess"},"content":{"rendered":"

I am simulating for simple combustion of air-fuel mixture at different temperatures and equivalence ratios. The primary fuels that I’m using are- m-Xylene and n-Dodecane<\/p>\n

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  1. JSRPFR model problem<\/span><\/li>\n

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    In this model I have a Perfectly stirred reactor followed by two Plug flow reactors. The error that occurs is-<\/p>\n

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    FATAL ERROR: SINGULAR JACOBIAN MATRIX”  and “TWOPNT: FAILURE. NO SOLUTION WAS FOUND. PSR FATAL ERROR:Twopnt reports no success in solving the problem” <\/strong><\/p>\n

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    The same problem is running well for equivalence ratios less than 2. This means there is no problem in the mechanism and set up of the problem. <\/span><\/strong>I want to use equivalence ratios more than 2. From what I have read, it seems changing initial guesses can help relieve the singular jacobian matrix error. Can you please guide how to do so or help me troubleshoot the problem? Can you please give tips about what might be the problem and what might be the path to solution?<\/p>\n

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    1. Burner stabilized flame-<\/span><\/li>\n

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      Again, there’s nothing complicated here. I am using the same fuel-air combustion problem. The SERDP mechanism runs well when I input n-Dodecane fuel. But, when I input m-Xylene fuel it gives error- ” ERROR: FAILURE. NO SOLUTION WAS FOUND. ERROR: Particle solver failed”.<\/strong><\/p>\n

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      1. Closed homogeneous reactor<\/span><\/li>\n

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        Here the case is even simpler. I am trying to simulate combustion of the same fuels in closed homogeneous reactor model. The error this gives here is- WARNING: Growth rate is negative, but an etching keyword was not input for this phase. <\/strong>This growth rate is regarding soot.<\/p>\n

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