Simulating rain

gallon

I am trying to set up a scene where I cast rain over a model loaded from .stl file. However I have to observe these two parameters: a) fixed drop velocity at impact and b) total rain intensity (mm/min). Total simulation time is about 5 minutes.

Well, I could place my drops in a high layer (to reduce average density and thus achieve the deisred rain intensity) but then they would gain great velocity during falling (this unlike real life where drops experience air resistance and thus fall more or less uniformly).

So I thought that maybe I could initially assign `zero` movement to the drops and then release them letting them fall. The casedef is generated in python so I can programmatically specify which drop when to release.

Apparently this approach doesn't work because it turns out I cannot assign movements to fluids...

Could anyone help me out?

gfourtakas

Hi,

does the external forces (external acceleration) helps?
maybe you need to play around with that!

thanks
George

PS: I am dying to see that video..

gallon

It may be a hint, I'll check this up.

Meanwhile, I've written a model case where I put a drop into a topless box... and then remove the box in a rapid movement. Kinda lol: https://www.dropbox.com/s/c4yvoeeqq1gy4xc/6.avi?dl=0

gallon

Hi George,

external forces do the trick, thanks a lot. They just slipped my mind.
I'll share the full movie this weekend

Alex

For the movie I would suggest you to plot the particles, no the isosurface
Regards

gallon

Too bad that max number of different mk's is 256

Alex

Next release will include high number
Regards

gallon

Alex, will it be at least int?

gallon

Alex, George: since I cannot assign a different force to every drop due to the mk cap, for now I will cast rain in layers... 256 layers of rain is agreeable for my task.

gfourtakas

good to hear..

have fun!