Fluids

Fluids

How to define momentum source for mass source term?

    • Weiqiang Liu
      Subscriber

      Hi all,


      I am modeling a porous soot cake combustion with fluent. The case is transient and local soot concentration is considered as an UDS. I almost get everything right except Y velocity contour for my case.


      In order to debug my model, I tried a lot of methods. One of these was to add an momentum source for the generated mass source. Because my problem is Y velocity in porous zone is too small, I think a momentum source could accelerate gas in porous zone. However, it seems no difference whether momentum source is included or not. Therefore, I think maybe my momentum source was added in the wrong way.


      For specific, I defined momentum source for mass source in the following way:


      x momentum source=mass source*cell volume*x velocity


      y momentum source=mass source*cell volume*y velocity


      I am wondering did I define momentum source in the right way? Because if I do some dimension analysis, I found the unit is different in two sides of the equation. 


      My question is do I need to integrate the momentum term during time step? or how should I define my momentum term for mass source?


      Best regards


      Weiqiang

Viewing 0 reply threads
  • You must be logged in to reply to this topic.