[LuckyTran]

If it matters, I'm using OF 1.7 and 2.4

Currently I am using mapFields to map the entire velocity vector field from one case to another. But I would like to use mapFields to map only Ux from an existing case and leaev Uy and Uz alone. For my purpose I actually do want to set Uy and Uz to zero. Alternatively, I could map the vector U using mapFields and then overwrite Uy and Uz with zeros (using setFields for example). Do these utilities support manipulating only components of vector fields? What would be the syntax?

edit* I found a solution using funkySetFields.

funkySetFields -field U -expression 'vector(U.x,0,0)'

But it would be nice if someone has the solution using mapFields or setFields