[JinshiC]

Hi Foamers,

I am trying to obtain the gradient of all velocity components with run-time sampling at given lines. Yet I am not able to directly code sth. like grad(U) in the "field". It seems that it can only take the fields which is directly output by the model (such as U,k,R, etc). I am wondering is there an easy way to modify the controlDict file in order to obtain grad(U) at given lines? Thanks a lot!

Best,
Peter

[Yann]

Hi Peter,

You can use the grad function object to compute grad(U): https://develop.openfoam.com/Develop...ld/grad/grad.H

Hope this helps,
Yann

[JinshiC]

Hi Yann,

Thanks so much! This works perfectly.

Best,
Peter