User Defined Function for Droplet Phase Detection for VOF Model in ANSYS Fluent (cpad_udf_library)

UDF library for the detection and localization of separated continuos phase areas (for example droplets) in Multiphase VoF (Volume of Fluid) ANSYS Fluent cases.

Currently Limitations:

• limited to double precision Fluent cases
• also works in parallel (but on the parallel partition boundary over edge detection will not work and fall back to over face detection ...)

Settings:

#define _PHASE_IDX 0            /* for phase to detect droplets of */
#define _MIN_VOL_FRAC 0.01      /* Lower Limit for phase detection */
#define _DETECT_OVER_EDGES 1    /* 0 = detect over faces */

#define _FLUID_  1              /* Fluid Cell Zone ID*/

Captured properties of separated continuos phase areas are:

• cell count
• x,y,z center of mass
• volume
• mass
• average volume fraction
• max volume fraction
• connected boundary id's

For reconstruction of parallel cpa files take a look at of-cpad-library: Evaluation Scripts.