[Nek5000-users] surface tension (Marangoni effect) driven flows

[nek5000-users at lists.mcs.anl.gov]

Hi Frank,

I guess you have to deal with a sharp interface in your two-phase flow problem.
The question is how do you resolve this interface having in mind (a) accuracy and (b) boundness (stability).

High-order methods are typically less robust to under-resolution and you need to play some tricks to get a bounded solution (e.g. using flux-limiters).

How do you plan to tackle this problem?


-Stefan

 
On Apr 2, 2010, at 1:14 PM, nek5000-users at lists.mcs.anl.gov wrote:

> Hello all,
> 
> I am interested in the opinion of users and developers as to whether it
> is practical to use Nek5000 for a "two-phase" flow problem.  I write
> "two-phase" since the interface between the two fluids is fixed, with
> only the shear stress and tangential velocity matched there (normal
> velocity being zero) and temperature and normal heat flux.  In addition,
> on the liquid side of the interface there is a shear stress proportional
> to the temperature gradient along the interface (Marangoni effect).  
> 
> Also, am I correct in understanding that all components of velocity are
> stored at the same location (the Gauss–Lobatto–Legendre points), while
> the pressure is located at the Gauss–Legendre points?  This being in
> contrast to a MAC type staggered grid, where each velocity component
> resides at different spatial locations.
> 
> Cheers,
> Frank
> 
> -- 
> Frank Herbert Muldoon, Ph.D. Mechanical Engineering
> Technische Universität Wien (Technical University of Vienna)
> Inst. f. Strömungsmechanik und Wärmeübertragung (Institute of Fluid
> Mechanics and Heat Transfer)
> Resselgasse 3
> 1040 Wien
> Tel: +4315880132232
> Fax: +4315880132299 
> Cell:+436765203470
> fmuldoo (skype)
> http://tetra.fluid.tuwien.ac.at/fmuldoo/public_html/webpage/frank-muldoon.html
> 
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