Multiplying elements of geometricFields
 

hey
I'm new at openFoam and got some troubles with it.
I got a geometricField GeometricField<Type, fvsPatchField, surfaceMesh>& a , which contains vectors of velocity for all faces. It's no problem to access the vectors by face, but I need to get access to each separate element of these vectors. This doesn't work. I I want to multiply the elements each with a different coefficient and the existing operators don't support things like this. I even tried all things I know, but everytime there's a failure.
Can you help me

thanks
sepp