# Mixed boundary condition

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 October 2, 2007, 09:21 Hi everybody, I'm an absolu #1 New Member   Heiko Brandt Join Date: Mar 2009 Location: Dortmund, NRW, Germany Posts: 1 Rep Power: 0 Sponsored Links Hi everybody, I'm an absolute beginner in foam. I try to solve an evolution equation of a drop shape h(x,t) with three b.c. Because of symmetry I only have to solve a 1D problem from the middle of the drop (x=0) to one side (x=a(t)). The b.c. are 1) h has a zerogradient at x = 0 2) h is zero at x = a(t) 3) The Vol of the drop is const., so the integral of h over x is 1. The equations for a(t) and h(x,t) are uncoupled. As the third condition is not a numerical one, I will use a shooting method and guess h(x=0) until the volume is 1. And that's my problem, how can I implement a fixedValue and a zerogradient at one side of the mesh in foam? The mixed type in foam is an either..or condition, isn't it? It depends on the value of Valuefraction whether there is a zero gradient or a fixed value. But that's not what I want. Thanks a lot!! Heiko

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