PARTICLE TRANSPORT IN LAMINAR/TURBULENT FLOWS

GIMENEZ JUAN; RAMAJO DAMIAN; NIGRO NORBERTO

Salta

Congreso; MECOM 2012; 2012

AMCA

The implementation of a Lagrangian particle transport model in non-homogeneous turbulentflow is presented. The model proposes one-way interaction between the continuous and the discretephases where the behavior of the continuous one is previously solved with other CFD software. Particledynamics include four forces terms: buoyancy, inertial, drag and added mass. Also, a Discrete RandomWalk (DRW) formulation is added to model the changes on the trajectory of the particles due toturbulence.The temporal integration is carried out using a Runge-Kutta-Felhberg (RKF) integrator, and a novelanalytical integrator is used to solve particle-wall collisions. To manipulate the time-step on each particle,a three-layer filter is developed: an user layer, a RKF layer and a physical layer determined by the particlerelaxation time. Also, it is proposed an efficient implementation that uses shared memory techniques toparallelize the execution.To validate the developed code, laminar and turbulent academic tests are presented. Finally,experimental test data from a pilot plant are reproduced using the in house code along with a commercialCFD software, showing a good agreement with data and a radical improvement in time computingcomparing with the CFD software.