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Definition of Normal Vectors for flux
Posted 19 ott 2010, 13:11 GMT-4 0 Replies
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I'm using the Nerst Planck equations to model flow of ions and I'm having some confusion regarding the sign for the fluxes. The boundary conditions allow for an 'inward current' as well as a mass flux. Are the signs of the normals for these two boundary conditions the same or are they reversed? (I am defining a normal here as poiinting outwards from the domain under consideration)
I have a circular subdomain inside a rectangle. For the circular subdomain I would assmue that the normal is pointing outwards, away from the center of the circle. For rectangular subdomain, at the interface between the circle and the rectangle, the normal would be pointing outwards from the rectangular domain, hence this time, towards the center of the circle. Are these assumptions correct?
Thanks!
Best Regards
raj
Hello Rajlakshmi Purkayastha
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