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LS Dyna

LS Dyna

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  3. CESE solver – Ignition mechanism

CESE solver – Ignition mechanism

    • August 28, 2024 at 10:25 pm
      Atish Gawale
      Subscriber

      Hello,

      I am using CESE solver to simulate adiabatic expansion of compressed H2 gas (700bar) into surrounding air using chemkin mechanism. H2 should react with O2 to form water. 

      It is found that there was no ignition at h2-air interface. but when I patch few elements surrounding compressed H2 gas with product H2O, then I can see combustion happening at gas -air interface. I was wondering why presence of H2O has strong influence on ignition. Is it related to turbulence model or CESE solver? or chemkin mechanism? Can you share the equations related to ignition mechanism in CESE solver.   

    • September 10, 2024 at 5:19 pm
      Reno Genest
      Ansys Employee

      Hello Atish,

      Which LS-DYNA keywords are you using? Could you post your main keywords here as text?

      Note that Ansys employees cannot updload and download files on the Ansys Forum. 

      If you are a commercial customer, please create a support case on ACSS and we will have a look at your model:

      customer.ansys.com

       

      Let me know how it goes.

       

      Reno.

    • September 18, 2024 at 4:09 pm
      Atish Gawale
      Subscriber

      Hi, I am using following keywords along with CESE solver.

      *CHEMISTRY_CONTROL_FULL
      *CHEMISTRY_COMPOSITION
      *CHEMISTRY_MODEL

      *CHEMISTRY_PATH

      Regards,

      Atish

    • October 30, 2024 at 2:29 pm
      Atish Gawale
      Subscriber

      Hello Reno,

      Could you help with my above query?

      Regards,
      Atish

    • October 30, 2024 at 5:09 pm
      Reno Genest
      Ansys Employee

      Hello Atish,

      Ansys employees are not allowed to comment on topics that could be export controlled. Hopefully other users will be able to help you.

      If you are a commercial customer, please create a support case on ACSS and we will be able to help you:

      customer.ansys.com

       

      Reno.

    • October 30, 2024 at 5:15 pm
      Atish Gawale
      Subscriber

      Why LS-Dyna comes under export controlled compliance? How to reach out for help being an academic user?

      Do you provide any paid technical assistance for academic license users?

      Regards,

      Atish

    • October 30, 2024 at 5:21 pm
      Reno Genest
      Ansys Employee

      Hello Atish,

      The application could be export controlled/ITAR for military purposes and we have no way of verifying this information on the Ansys Forum. You are doing ignition of compressed H2 and so this could be a weapon.

      If your academic institution owns a commercial Ansys license, you should be eligible to technical support on ACSS (customer.ansys.com).

      You can contact your Ansys account manager for other ways you can get technical support.

       

      Let me know how it goes.

       

      Reno.

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