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- - **How to implement flux vectors**
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How to implement flux vectorsHi Foamers,
is there a clever way to implement an equation with different flux vectors? For example I try to solve an 2D equation of the form: ddt(A) + ddx(B)+ddy(C) = 0, where A is the vector containing the 4 unknowns and B,C are the flux vectors, which contain again the unknowns and some constants. On the paper I have done this in two steps, solving X = -ddx(B)-ddy(C) using various spatial discretization schemes, for example central differences. My second step is then to solve ddt(A) = X, using backward Euler time discretization to update the unknowns. Thus in the theory it is not difficult, but since I am new to OpenFOAM and C++, the application is quite hard. My current problem is the implementation of the spatial derivatives in only one direction. Furthermore I am looking for a sophisticated way how to setup the flux vectors itself after defining the fields of the unknowns in createFields.H. Thank you in advance for any hints. Dean |

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