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You have to create your own mesh and you have to convert your u and v to mesh interpolations. (In the example in the documentation, NDSolveValue does this itself in constructing uif, vif.) Example: Needs["NDSolve`FEM`"] mesh = ToElementMesh[FullRegion[2], {{0, 5}, {0, 1}}]; u = Function[{x, y}, x (y - 0.5)/25]; v = Function[{x, y}, -x^2/50]; uif = ...

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