[reverseila]

Dear all,


With postProcess -func "grad(V)" -latestTime I can compute the gradient of V (electric potential), for the latest written iteration (for a steady state simulation). However, how can I compute the multiply gradient of a field by -1?


The problem is I cannot use the following:

--> FOAM FATAL IO ERROR: (openfoam-2312)
Wrong token type - expected word, found on line 0: label -1

I'm trying to transfer the calculation of electric field from the steady state solver to one time calculation of a gradient with postProcess after simulation is done.


I would also like to give the resulting field a name. For example, when I compute grad(magSqr(V))it produces a field with the name: grad(magSqr(V)). I want to give it the name EdotGradE.


$FOAM_API: 2312

[reverseila]

To restate my problem in a simpler way, how to multiply a field by a scalar?
I think OpenFOAM foundation has a `scale` function object but it seems that OpenFOAM-ESI does not have any way to do that, as far I know.

[Yann]

Hello,

In the OpenCFD branch, have a look at the reference and exprFields function objects.

Regards,
Yann

[reverseila]

Thank you Yann!


I think that will do it. I will use it in the future (I wrote a new solver just for that in last few days).