Flip fluid and vdb collision

[wildon]

Hello every body, 

i make a sample scene for review. 

i have one fluid source and one pipe, 

at the begining , everything work fine, my fluid go through the pipe as expected. 

but after, my pipe leak from everywhere. i don't understand why. 

even if my fluid move slowly, i increase my substep. but nothing change. 

no body know what i am doing wrong? 

ps: you can dowload the mesh of the pipe here https://www.dropbox.com/s/ih3lrjcfp1wf08g/Pipe.obj?m=

VDB_leak_h264.mov

vdb_leak.hipnc

[Nando]

honesty it works like a piece of cake for me, and i see u have increaded a lot of substeps to get things right .. all i did was just put it back all to defaults 

and i recomputed the vdb again, and nothing much chk the file 

 

vdb_leak fixed.hipnc

Edited April 19, 2014 by Nando

[wildon]

i think i miss something. 

your scene and mine are exactelly the same. 

but when i simulate mine everything go away, 

but when i open yours is ok...

your are sure, you modifie nothing? what is your version of houdini? i understant nothing...

[daehuck]

decrease the particle seperation... I did(1 -> 0.08) and it works fine..

[wildon]

oki is working all the time now.

i just increase the tickness of my collision mesh. 

another strange behavior. why the vicosity totaly desapear when i activate collision? 

is hard to belive but in the frist and the second video, the fluid have the same settings. 

i just activate the collisions with the pipe. 

 

viscosity.mov

viscosity_faill.mov

[wildon]

maybe the awser is into the scene...

viscous_trhough_pipe.hipnc

[wildon]

somebody on sidefx forum give me the solution. 

for avoird this problem, we need to decrease the particles separation or reduce the surface extrapolation under volume motion into the collision tab of the flip solver.

[radurock]

somebody on sidefx forum give me the solution. 

for avoird this problem, we need to decrease the particles separation or reduce the surface extrapolation under volume motion into the collision tab of the flip solver.

that's what the guy above you said. also surface extrapolation has nothing to do with that. it controls the blur effect for the velocity. smaller surface extrapolation -> higher dynamic splashes. bigger surface extrapolation -> more calm fluid,and blurred vel field

Edited May 22, 2014 by radurock