Fluids

Fluids

DPM injection error

    • shal3391
      Subscriber

      Hi,


      I am running a DPM injection of water into a 3D domain using a plain orifice single phase atomiser. However the DPM parcels are just hovering at the injection point as shown in the attached figure. WHat could be some possible reasons for this?

      Thanks

    • Rob
      Ansys Employee
      How many time steps have you run? n
    • shal3391
      Subscriber
      Nearly 100 now, but the time step has reduced to 1e-08, which is the lower limit of my adaptive time-step criteria. n
    • shal3391
      Subscriber
      This is the injection area at 10,000 time steps. Despite having a high flow rate, the particles aren't injecting properly, with a very low velocity.n
    • DrAmine
      Ansys Employee
      What does the particle summary tell? Also please test with 2020R2.n
    • Rob
      Ansys Employee
      What does the flow field look like in that area? n
    • DrAmine
      Ansys Employee
      How does the pressure field look in that region?n
    • shal3391
      Subscriber
      Hi, I have attached velocity and pressure contour plots on the xy plane of my domain, I have also attached the mesh of the walls in my domain. I notice that the pressure plot looks odd, as if my boundaries between cell regions is influencing the pressure.nnn
    • shal3391
      Subscriber
      I have used 2020R1 and gotten the same result. nParticle summary: Advancing DPM injections ....nnumber tracked = 105534, escaped = 0, aborted = 0, trapped = 0, evaporated = 0, incomplete = 0, incomplete_parallel = 0, shed = 0n
    • Rob
      Ansys Employee
      The odd bit there is that you have interior labels set as walls, can you check you've not turned the cell facets into walls somewhere. The DPM tracks make sense for transient particles as they're not going anywhere they've not really done anything. If you turn off transient on the particles what does the plot look like? n
    • DrAmine
      Ansys Employee
      pressure field is odd. Check what Rob suggested. The plain orifices require reasnoable total pressure at the injection position to work its algorithm.n
Viewing 10 reply threads
  • You must be logged in to reply to this topic.