Ansys Fluent: How to obtain the current density in MHD module?

- January 11, 2023 at 5:33 am
  
  LCC
  Subscriber
  
  I try to simulate the arc in welding so MHD module is used. The source term in the energy equation needs the current density. I wonder if there is a macro that can obtain the current density or other method that can obtain it directly? Thanks a lot.
- January 11, 2023 at 10:24 am
  
  Rob
  Ansys Employee
  
  It's complicated. What are you trying to find out, and which plasma model are you using?
  - January 13, 2023 at 9:06 am
    
    LCC
    Subscriber
    
    Hi！I use MHD model to simulate the plasma but I do not know how to obtain the current density. And the source term of the energy equation is shown in the figure.
- January 13, 2023 at 5:24 pm
  
  Rob
  Ansys Employee
  
  What paper/setup are you planning on using MHD for? It's designed more for magnetic fields in metal stirring, plasma isn't going to be easy.
  - January 15, 2023 at 4:03 pm
    
    LCC
    Subscriber
    
    I use MHD for metal welding and I am trying to simulate the welding arc.
- January 16, 2023 at 3:24 pm
  
  Rob
  Ansys Employee
  
  The MHD module will not calculate the magnetic field induced by the arc current. It is not a complete EM solver. If the arc is DC you will need to consider using Ansys Maxwell. If it's high frequency AC you'll need Ansys HFSS, low frequency will work with Maxwell. This is not a straightforward project and should be approached with caution.
  - January 18, 2023 at 12:51 am
    
    LCC
    Subscriber
    
    I get it now. Thank you for the well explained answer.

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