Case Setup For CFD Simulation Of Particle Droplet Collision Left 3D Computational

Particle collision model in CFD

The standard Lagrangian model is limited to gas-particle diluted flows. Therefore, in these processes, particle interaction does not play an important role and the momentum is transmitted through continuous interaction with the particle. For flows with the above parameter less than 10, the interaction between the particles is important and should be considered in calculations to simulate particle collisions. In this model, it is not necessary to track the path of all the particles simultaneously, instead of it, a repetitive approach is used. The Summerfield particle collision algorithms are as follows:

  • Calculate the direction of motion of the particle in a periodic manner
  • 2- Calculating the particle properties by statistical means and standard deviation of the diameter and velocity of the particles
  • Creating a virtual collision based on the particle’s statistical properties
  • Random processes decide whether a collision occurs
  • 5- Go to 1

To adjust the collision of particle to particle we must select the Fluid Pair Models tab from Flow Analysis, and then activate the Particle Collision box. Then you have to choose one of the existing models. There are two types of User-Defined and Summerfield models in the software. In the User Defined model, the user defines the collision model. Input parameters in the Summerfield model are elastic coefficients, static frictional coefficient and kinematic frictional coefficient. If both coefficients of elasticity are equal, it is completely elastic and otherwise it is non-elastic. To investigate the effect of particle collisions on their pathway, the experimental tests such as Fohanna & Oesterle are considered.

 

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