Fluids

Fluids

need to setup the “monitor/report file” to track numbr/mass of the particle in each section of tube

    • mkalel
      Subscriber
    • Rob
      Ansys Employee
      Have a look in the tutorials & User's Guide for the DPM model as this will go through injections etc. From there you can set up the DPM Reports to tell you whether particles pass a certain interior face. It's also possible to report the trapped particles in the same way. I'd suggest using several single size injections over the size distribution as it's easier to work out what sizes finish up where. n
    • mkalel
      Subscriber
      Thank you and Appreciated for your Helpful Comment.nI reviewed the user guide and watched some tutorials and got idea about injecting the particle with actual timestep necessary to fill the section of the pipe.nI tracked the injected mass vs flow time in one plot window and Escaped mass Vs flow time in second window............and so on until 10 monitor.nnI have setup the all of my long tube wall condition to trap. Now Here is what I wanna do. nI tracked the mass of the particle need to fill the section 1 and I ran the simulation until that specific number time step to fill the whole first section of the tube which wall condition was set to trap initially.n I am having this problem:nNow I want to turn the wall Boundary Condition of section-1 to reflect to let the particle move to section-2 (wall condition: trap) and run the calculation with enough number of time step. nHow Can I do this to continue the cycle of moving the particle from sec-1 to sec-2? I tried without initializing the setup but the particle are not reaching section 2. I am not getting any plot data(Escaped mass Vs Flow time) that I setup for section 2 .nIsn't particle supposed to move from section-1 to section-2 after changing the sec-1 wall BC to reflect ?.nCan Somebody help me on this ? I will really appreciate thisnnThanks
    • Rob
      Ansys Employee
      Assuming there isn't something blocking them and you still have particles in the domain then yes, I'd expect them to continue. n
    • mkalel
      Subscriber
      thanks for the comment.ni stopped the mass injection of the particle after certain flow time . I was expecting that the particle which are still in the domain will be pushed further down by the continuous incoming fluid. nBut after running the simulation for almost a day, they stick to the wall of section 2 and not moving to section 3 even after changing section-2 wall conditions to reflect. Is it the higher particle density issue or what do you think ? ni am guessing that particle is too heavy than fluid . So they settled down to wall of sec-2. nwhat is your idea about ? nthanks in advancen
    • Rob
      Ansys Employee
      If the particles settle they may be stuck in the boundary layer. Read the maths/assumptions in the DPM part of the User's Guide to understand why. n
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