Learning Forum

[YiNie]

I am going to capture and quantify the generated micro-scale and high-temperature droplets (or particles) during the laser cutting process using Fluent. Two approaches have been applied but with problems as follow:

1. VOF-to-DPM is applied successfully to capture and transfer small liquid lumps into DPM particles. However, the DPM particles will consistently keep the high temperature in the following flow process shown as in the figure below. The fact should be that the DPM particles will continue to be cooled down by surrounding air.

2. Only VOF is activated for the multiphase simulation of the laser cutting process. But when it comes to post-processing, we found it is very hard to capture so many separate liquid lumps not even to analyze the mass and velocity of the lumps.

I am wondering if there is any code that could enable us to capture separate VOF liquid lumps (like VOF-to-DPM technique) during post-processing or if there is any way to activate the heat transfer of DPM particles?

[Rob]

If the DPM model is coupled then particles will heat/cool depending on the local flow. nRe the VOF lumps, the data is all there but how you'd separate every lump to get the data is a different issue. Have a look at vrml output and surface imprinting to see if you can hook something up. n

[YiNie]

Thanks for your reply! We have figured out that DPM particles could be cooled down during the following flow. nBut we want to check the shape of the lumps that are transferred to DPM particles, as our experiment shows that the generated particles are long strip type rather than spherical. Is there any way we could output the vof lumps that have been transferred?nOn the other side, we just give up vof-to-dpm and only activate vof. But the vrml output and surface imprinting seem to be helpless to separate every small vof lumps separately during post-processing. We guess there should be a similar code applied by vof-to-dpm that can capture separate lumps and evaluate their velocity and volume.n