# dpm-stochastic particle tracking

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 September 24, 2003, 01:37 dpm-stochastic particle tracking #1 Anna Blioebig Guest   Posts: n/a Sponsored Links Hi all, I'd like to use the stochastic particle tracking for turbulent dispersion of particles in a turbulent flow. I followed the instructions in the ug but in my case the "number of tries" option is always inactiv and not selectable. Can anybody tell me a reason for this? How can I be sure that the turbulent dispersion of particles will be included by FLUENT? What do I have to do that this option will be selectable? Brief discription of my settings: Flow field: seg-solver, rsm-turbulence model, steady, 3d. After convergence of the flow field I introduced particles using the dpm-model dpm-setup: single injection, flow rate 0kg/s, dp=4e-6m, inert particles, stochastic model: random eddy life time - time constant 0.3. Thanks for all helpfull replies Anna

 September 24, 2003, 03:52 Re: dpm-stochastic particle tracking #2 Ben Guest   Posts: n/a Try a group injection not a single injection. Also why is your flow rate set to 0kg/s. This cannot be set to 0kg/s. When using the DPM approach you inject in a particle stream (or streams). The stream is characterised by it's strength, which is determined by the number of particles within the stream that pass a point per second.

 September 24, 2003, 07:03 Re: dpm-stochastic particle tracking #3 Anna Bliebig Guest   Posts: n/a I included your advices in my calculation but it didn't solve my problem so I returned to the old settings. A 'group injection' is used if you want to set the defined initial conditions (d_p, T_p, x-, y-,z-coordinates..) between a certain range (see ug 19.9.2). Then FLUENT uses a linear variation between first and last value. I use a mass flow rate of 0kg/s because for uncoupled calculations it isn't necessary to specify a value (see ug 19.9.5). Over the several attempts to make the 'number of tries' check-box selectable I noticed that for me it isn't possible to use the cloud tracking model. But it is selcetable in the 'set multiple injections properties' panel - that seems funny to me. Are there any exlpanations for this? Anna

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