[Sidefx-houdini-list] Flipping viscosity

nicholas pliatsikas nicholas.pliatsikas at gmail.com
Wed Sep 21 08:21:32 EDT 2011


Nice one Nick van Zutphen !! ;¬) Did you come up with fix too?
Cheers
Nick

On Wed, Sep 21, 2011 at 12:58 PM, Nick Zutphen <nvanzutphen at live.com> wrote:

> Hi Nick!
>
> I just had a look at the file that you shared and I figured it looked very
> familiar to me. Turns out, I made this file during my internship with SideFX
> in Toronto last summer :p. When I started writing this email I suddenly
> remembered that at  some point I was in contact with a 'Nick'.
>
> Cheers!
> Nick van Zutphen
> ----
> http://www.nickvanzutphen.com
>
> On Sep 21, 2011, at 1:41 PM, nicholas pliatsikas wrote:
>
> > Hey andy
> > Ok there where various fixes that we came across and sidefx also sent
> > heres one for surface tension
> >
> http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=20359
> >
> > and the text from me to sidefx support regarding this
> >
> > Anyways Id like to put an rfe/bug report in for the flip fluid solver.
> After
> > some tests it seems that surface tension, viscosity and friction dont
> work
> > at all on the flipfluid solver, im thinking that they havent been
> implement
> > rather then they dont work.
> >
> > Theres a wee thread on sidefx.com regarding some of this.
> >
> > http://www.sidefx
> > .com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=20359
> >
> > The surface tension can be added to the flip solver very easily using a
> gas
> > surface tension microsolver. So im guessing it should be pretty easy to
> > integrate correctly into the flip setup.
> >
> > For viscosity, we tried gasblur on velocity etc but this messes with
> general
> > velocity to an extent it slows down the fluid as whole, for example the
> > fluid would look like its floating as gravity doesnt have the same pull
> on
> > it due to blurred velocity.
> > Sidefx sent me a better solution, Ive uploaded the file sent to me with a
> > better working viscosity, i cant quite recall what the changes where off
> the
> > top of my head.. but i do think there where some notes in the file.
> >
> > http://www.mediafire.com/?t1u8ts2gnntb1vp
> >
> > Either way sidefx informed me that these issues should be solved in the
> next
> > houdini version.
> >
> > Hope that helps
> > Cheers
> > Nick
> >
> > On Wed, Sep 21, 2011 at 11:25 AM, andy at andynicholas.com <
> > andy at andynicholas.com> wrote:
> >
> >> Hi Nick! Thanks a lot, much appreciated :)
> >>
> >> Cheers,
> >> Andy
> >>
> >>
> >> On 21 September 2011 at 10:28 nicholas pliatsikas
> >> <nicholas.pliatsikas at gmail.com> wrote:
> >>
> >>> I had the exact same problem, i ended up contacting support about this
> as
> >> it
> >>> really became a big limitation. Let me do a wee search through my email
> >> and
> >>> will pass you the relevant information.
> >>> Cheers
> >>> Nick
> >>>
> >>> On Tue, Sep 20, 2011 at 10:50 PM, andy at andynicholas.com <
> >>> andy at andynicholas.com> wrote:
> >>>
> >>>> Hi all,
> >>>> I have a feeling I know what the answer to this'll be, but I need to
> >> ask
> >>>> just in
> >>>> case... does anyone know if there's any way of getting FLIP fluids to
> >>>> exhibit
> >>>> some sort of viscosity?
> >>>>
> >>>> I've had a quick play with SPH and the speed (or lack of) means that
> >> it's
> >>>> not
> >>>> really an option. FLIP is so much faster, but I'm just lacking the
> >> control
> >>>> over
> >>>> the thickness that I need to achieve. Anyone tried any POP or SOP
> >> solver
> >>>> hacks
> >>>> to get this effect?
> >>>>
> >>>> Any pointers gratefully received.
> >>>>
> >>>> Thanks :)
> >>>>
> >>>> Andy
> >>>> _______________________________________________
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> >>>>
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