DPM : Fluid velocity at particle position ?

souria · January 26, 2015, 06:04

Hey everyone,
I'm using DPM for particle transport. For this, Fluent integrates the particle movement equation. I want to know how Fluent calculates the fluid velocity at particle position ?

All I find in the Theory Guide is this equation (in the image), Un+1 , But I don't understand the whole equation ... Did fluent do an interpolation to get the velocity at particle position, which one ?

Thanks for your help,

Souria

Cheers

CeesH · January 30, 2015, 05:58

Hi Souria,

The particle velocity depends on the model you are using. For massless tracking, the velocity is simply set equal to the continuous phase velocity in the cell (plus a turbulent 'kick' if you enable the turbulent dispersion model).

For massive particles of all types, FLUENT integrates a force balance to determine the velocity. Basically this is Newton's second law, F = m*a.
Here, the F terms include all forces you enable - typically at least drag, buoyancy, and perhaps others.

More information can be found in the theory guide: http://aerojet.engr.ucdavis.edu/flue...ug/node809.htm (or of course a newer version on ansys costumer portal/your workbench)

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January 30, 2015, 05:58		#2
CeesH Senior Member Cees Haringa Join Date: May 2013 Location: Delft Posts: 607 Rep Power: 0	Hi Souria, The particle velocity depends on the model you are using. For massless tracking, the velocity is simply set equal to the continuous phase velocity in the cell (plus a turbulent 'kick' if you enable the turbulent dispersion model). For massive particles of all types, FLUENT integrates a force balance to determine the velocity. Basically this is Newton's second law, F = m*a. Here, the F terms include all forces you enable - typically at least drag, buoyancy, and perhaps others. More information can be found in the theory guide: http://aerojet.engr.ucdavis.edu/flue...ug/node809.htm (or of course a newer version on ansys costumer portal/your workbench)