[Trailblazer_CFD]

Hi guys! I am using openfoam.
I have a question when I apply the code: postProcess -func probe.
I use this to extract my simulation data and probe is my probe file. In the file, I entry three fields: U, mag(U), U.component(0) as suggested in openfoam documentation.

U gives me all the three components of velocity. Mag(U) gives me the magnitude. They all works well.
But U.component(0) gives a error. It says:
--> FOAM FATAL ERROR: (openfoam-2312)
Component specification not allowed for U.component(0).


But according to many documentations, it should be correct. Do you know how to solve this error?


Btw this is my probe file content:


probe
{

type probes;
libs ("libsampling.so");
writeControl timeStep;
writeInterval 400;
fields
(
U
mag(U)
U.component(0)
);

probeLocations
(
(325.5 325.5 630)
(346.5 346.5 630)
);
}