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ANSYS FLUENT – Riser – Dense Discrete Phase Model (DDPM)

Source: DDPM

Advances in computational fluid mechanics have provided the basis for further insight into the dynamics of multiphase flows. Currently there are two approaches for the numerical calculation of multiphase flows: the Euler-Lagrange approach and the Euler-Euler approach


Since the given approach makes use of the Eulerian multiphase model framework, all its limitations are adopted:

  • The turbulence models: LES and DES turbulence models are not available.
  • The combustion models: PDF Transport model, Premixed, Non-premixed and partially premixed combustion models are not available.
  • The solidification and melting models are not available.
  • The Wet Steam model is not available.
  • The real gas model (pressure-based and density-based) is not available.
  • The density-based solver and models dependent on it are not available.
  • Parallel DPM with the shared memory option is disabled.


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The available boundary conditions, include the following:


The particle rebounds the off the boundary in question with a change in its momentum as defined by the coefficient of restitution.



The trajectory calculations are terminated and the fate of the particle is recorded as “trapped”. In the case of evaporating droplets, their entire mass instantaneously passes into the vapor phase and enters the cell adjacent to the boundary.  In the case of combusting particles, the remaining volatile mass is passed into the vapor phase.



The particle is reported as having “escaped” when it encounters the boundary in question. Trajectory calculations are terminated.


Readers Comments (1)

  1. sir
    i am doing MS Mechanical , i need to capture the diesel spray breakup by KHRT in compressed air.
    can you make a tutorial for me to capture that and get the results such as penetration length , particle diameter, liquid spray length,etc
    air is compressed in cylinder at pressure 4 Mpa and density 10 kg/m^3
    diesel injection velocity 340 m/s,
    particle injection


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