Multiphase Flows

Multiphase Flows

How to set a particle injection duration time in ANSYS CFX?

    • FAQFAQ
      Participant

      This is possible by setting the number of parcels being injected proportional to Mass Flow Rate. In the following example particles will stop being injected into the domain after a certain injection duration time.
      1/Define following expressions of the form:
      switch = if(t < tinjection,1,0) tinjection = 0.015 [s] Mpdot = 9.41e-4 [kg/s] where tinjection is the particle injection interval and Mpdot is the required mass flow rate.
      2/ Define the Particle Mass Flow Rate using an expression:
      Mpdot*switch
      3/Choose “Proportional to Mass Flow Rate” for “Number of Positions” and define particle number Np. Based on this setup, after starting simulation, N parcels are injected every time step until flow time >= tinjection N = time step size * Mpdot * Np Keywords: Particle, Injection, Time