Multiphase Flows

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  3. How to stabilize DPM evaporation rates of droplets in incompressible cases? How to remove dependency of evaporation rates of droplets from local pressure?

How to stabilize DPM evaporation rates of droplets in incompressible cases? How to remove dependency of evaporation rates of droplets from local pressure?

Tagged: fluent, fluid-dynamics, MP - Particle Tracking, multiphase, phase-change
    • January 25, 2023 at 7:17 am
      FAQFAQ
      Participant

      According to chapter 16.4.2. in the R19.1 Fluent Theory Guide, for the diffusion-controlled vaporization model the evaporation rate is calculated based on equations (16–101), (16–102) and (16–103). Equation (16–103) calculates the concentration of vapor in the bulk gas as a function of the local absolute pressure. In a case with a fluctuation pressure field this can lead to significant fluctuations of the evaporation rate (DPM Mass Sources). With the command (rpsetvar ‘dpm/absolute-pressure #f) the concentration of vapor in the bulk gas can be calculated as function of the operating pressure. This can help stabilizing the evaporation rates (DPM Mass Sources). Keywords: DPM, DPM Mass Sources, fluctuations, incompressible, evaporation, droplet, diffusion-controlled vaprorization

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