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About Brackbill's Continuum Surface Force (CSF) model |
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#1 |
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James Zhong
Join Date: Mar 2009
Posts: 25
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I am attempting to use Brackbill's Continuum Surface Force (CSF) model to simulate surface tension in a free-surface flow. For my simulation, the time step constraint imposed by the explicit treatment of surface tension is too tight. The allowable time step is up to the scale of 10^-9 second. Does anyone know any references which use an implicit treatment of surface tension under the framework of CSF? Thanks!
James |
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#2 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 396
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Hei James,
I also use the CSF method for free surface flow, but I don't experience such drastic constraints for the timestep. Maybe your code has an error. Depending on your formulation of your Navier-Stokes Equations, you may need to dived the surface tension source term by the density (or multiply with the volume, if you use the finite volume method). Cheers Hans |
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#4 |
New Member
James Zhong
Join Date: Mar 2009
Posts: 25
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I noticed that in Brackbill's paper, the average density <Rho> = 0.5*(Rho1 + Rho2). In some other places, this density is taken as a volume averaged value. Which is way is good? Thanks!
James |
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#5 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 396
Rep Power: 18 ![]() |
Hei James,
check this paper for the implementation of the CSF model: http://wissrech.ins.uni-bonn.de/rese...er/droplet.pdf Regards Hans |
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