# Multiphase: Boundary condition at interface

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 September 2, 2013, 11:23 Multiphase: Boundary condition at interface #1 Member   Join Date: May 2012 Location: Dresden, Germany Posts: 32 Rep Power: 6 I do multiphase simulation of two electrical conducting fluids. I was wondering if there is a possibility to introduce some boundary condition between the 2 fluids? I would like to send an electrical current through the fluids and have to ensure, that the gradient of the current is equal in both fluids at the interface. I was thinking about the surface tension of the fluids and the inter-facial tension which must be implemented somehow. Maybe that could be a first approach?

 March 24, 2014, 07:51 #2 New Member   Christian Join Date: Jan 2014 Posts: 6 Rep Power: 4 Hi mate, Are you working with electrohydrodynamic? I am stuck in the same problem. did you fixed it ? Thanks in advance

 May 15, 2014, 08:29 #3 Member   Timm Severin Join Date: Mar 2014 Location: Munich Posts: 60 Rep Power: 4 I assume none of you have found anything so far? I'm facing a similar problem, only with radiation. Currently it's all just theoretically, and I have no work done in that direction, but I plan to run the simulation with an interFoam based solver. Current idea: The interface tracking works by applying a factor somewhere along the lines of alpha * (1-alpha), which is close to zero anywhere apart from the interface. SO I'd consider just adding my interface condition to the equation and "damping" it with above factor normalised over 0.25. For a sharper interface you could also use the squared value. I'm not sure if that would work for your case, since you want to control the gradient, but maybe you can develop on that idea. Or maybe my idea is crap all along . Still, if you two want help supplying a bit more information from the start (e.g. multiphase modelling type) wouldn't hurt. __________________ PhD Student at the Institute of Biochemical Engineering at TU München Modelling of fluid dynamics in open photobioreactors. System: OpenFOAM 2.3.x, 64bit, 8 Core Xeon Workstation

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