Fluid-Particle Interaction with Rotor/Stator interface

Hello,

You can find the limitations of the Fluid-Particle Interaction module here. See the page "Fluid-Particle Interaction". The following should be kept in mind:

• The Lagrangian Module is compatible only with the mixing plane approach for Rotor/Stator interfaces.
• The Lagrangian module in parallel mode is not compatible with NMB connections.

Could you check the p0.log file in your computation directory for a section called "Particle tracking summary"? There should be some particle statistics in that section. Could you please paste it in your reply?

Best regards,

Botond

Hello Botond,

Thank you for your prompt response.

Excuse me for lack of knowledge about limitation, as I was using FINE/OPEN9.2 and referring corresponding manual, I did not see the R/S interface is compatible only with mixing plane. Is the limitation of FINE/OPEN 11.1 same as the one of 9.2?

Also when mixing plane approach is used, how the particle motion is treated when they face discontinuity of flow at mixing plane? 

Somehow I can not find the log file, so I restarted the computation, I will paste it here as soon as it is ready.

Best regards,

Hello,

You can find information on compatibility in the compatibility matrix of the documentation shipped with the version you are currently using. You can find the matrix under the "What's new" section of the 9.2 manual. The mixing plane-related limitation stated above is the same in versions 9.2 and 11.1

Regarding the treatment of particles crossing an R/S interface, please see the this Theory Guide page. 

Best regards,

Botond

An investigation was made into the particle-laden turbulent flow produced by a rotor hovering in ground effect over a mobile sediment bed. Measurements of the two-phase flow were made using time-resolved particle image velocimetry and particle tracking velocimetry as the rotor wake and its embedded vorticity approached and interacted with the sediment bed. Mobilized particles of 45–63 μm diameter (estimated to have a particle Reynolds number of <30 and a Stokes number of about 60) were individually identified and tracked in the resulting flow, with the objective of relating any changes in the vortical flow and turbulence characteristics of the carrier flow phase to the action of the dispersed particle phase. It was observed that, in general, a two-way coupling between the flow phases was produced near the ground, and in some cases, the coupling was very significant. Specifically, it was shown that the uplifted particles altered the carrier flow near the sediment bed, leading to an earlier distortion of the external flow induced by the blade tip vortices and to the accelerated diffusion of the vorticity they contained. The uplifted particles were also seen to modify the overall turbulence field, and when sufficient particle concentrations built up, the particles began to attenuate the turbulence levels. Even in regions with lower particle concentrations, turbulence was found to be attenuated by the indirect action of the particles because of the distortions made to the tip vortices, which were otherwise a significant source of turbulence production. After the tip vortices had diffused further downstream, the uplifted particles were also found to increase the anisotropy of turbulence in the flow.

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